OBD-II Code C1250: ABS Communication & Circuit Failure Guide

What Does C1250 Mean?

C1250 indicates the vehicle's main computer (ECU) lost communication with a critical Anti-Lock Brake System (ABS) component or detected an internal circuit failure. This involves the main ABS control module, the hydraulic actuator, or the power supply circuit. As a safety precaution, the system disables the ABS and Vehicle Stability Control (VSC), triggering warning lights on your dash.

Technical definition: While the generic SAE/ISO definition is 'ABS Inlet Valve Coil LR Circuit Failure', manufacturers use this code to signify a wide array of faults. On Toyota and Lexus vehicles, it points to a failure in the brake actuator assembly. On Ford vehicles, it indicates an internal circuit failure within the ABS module or its power relay. On Hyundai vehicles, it signals a problem with a height sensor in the electronic suspension.

Can I Drive With C1250?

Yes, But With Caution. Yes, but with extreme caution. The system disables your Anti-Lock Braking System (ABS) and stability/traction control. Your wheels will lock up during hard braking, increasing stopping distances by over 20% on loose surfaces like gravel. You will also lose steering control during a skid. Drive slowly, leave significant following distance, and avoid hard braking.

Common Causes

• Defective ABS Control Module or Actuator Assembly (Very Common) — This is the most frequent culprit. The internal electronics of the ABS module fail, or the hydraulic actuator/pump assembly breaks down. This is a well-documented, expensive failure on Toyota, Lexus, and Ford models.
• Bad Ground Connection for the ABS Module (Very Common) — A corroded or loose ground wire creates high resistance, which the system interprets as a communication failure. This is the primary cause on 1999-2007 Chevrolet/GMC trucks, where the ground point sits on an exposed frame rail.
• Low or Unstable System Voltage (Common) — A failing battery or alternator causes erratic behavior in electronic modules. The ABS module sets C1250 if it receives less than 12V during engine cranking or operation.
• Damaged Wiring or Corroded Connectors (Common) — Road debris, heat, or moisture damages the exposed ABS wiring harness, breaking the electrical connection between the module and the ECU.
• Blown ABS Fuses or Faulty Relay (Less Common) — A blown fuse or failed power relay takes the ABS module offline completely. Ford vehicles frequently experience ABS power relay failures that trigger this code.
• Low Brake Fluid Level (Less Common) — Excessively low brake fluid introduces air into the ABS pump, triggering pressure sensor faults that the system interprets as a critical error.
• Failed Yaw Rate or Steering Angle Sensor (Rare) — If a stability control sensor fails, the ABS module logs C1250 due to lost peripheral communication, though this usually sets a sensor-specific code first.

Symptoms

• ABS Warning Light is On — The amber ABS light on the dashboard illuminates immediately and stays on.
• Traction Control (VSC/ESC) Light is On — Because ABS and stability control share the same module, a fault disables both systems simultaneously.
• Continuous Buzzing Noise from Engine Bay — On Toyota/Lexus models, a failing actuator causes the hydraulic pump motor to run constantly, even with the key off, eventually killing the battery.
• Brakes Lock Up During Hard Braking — Without ABS intervention, the wheels lock and skid during a panic stop on wet or loose surfaces.
• Red Brake Warning Light is On — The primary red 'BRAKE' light illuminates alongside the ABS light, indicating a severe hydraulic failure or low fluid level.

Diagnostic Flowchart

Tap your situation to follow the diagnostic path that matches what you're seeing on this code.

Common Fixes & Costs

• Repair ABS Module Ground Connection — Parts: $5-$10, Labor: $75-$150, ~0.8 hr book time (Beginner)
• Repair or Replace ABS Module/Actuator Assembly — Parts: $150-$400 (rebuild), $1200-$3200 (new OEM), Labor: $300-$600, ~3.0 hr book time (Professional)
• Replace ABS Power Relay — Parts: $15-$30, Labor: $0-$50, ~0.2 hr book time (Beginner)
• Repair Damaged Wiring or Connectors — Parts: $10-$50, Labor: $125-$350, ~1.5 hr book time (Intermediate)
• Replace Brake Accumulator — Parts: $200-$400, Labor: $150-$250, ~1.2 hr book time (Professional)

DIY vs Professional

• Repair ABS Module Ground Connection — Beginner:
  Tools: Socket set, wire brush, sandpaper, dielectric grease.
• Repair or Replace ABS Module/Actuator Assembly — Beginner:
  Tools: Line wrenches, torque wrench, bidirectional scan tool.
• Replace ABS Power Relay — Beginner:
  Tools: None.
• Repair Damaged Wiring or Connectors — Beginner:
  Tools: Multimeter, wire strippers, soldering iron, heat shrink tubing.
• Replace Brake Accumulator — Beginner:
  Tools: Line wrenches, scan tool for depressurizing and bleeding.

Used vs. New Parts: Buying Guide

When a used part is worth it: For older vehicles (over 150k miles) where a new ABS module costs over 30% of the car's value. A used part from a reputable salvage yard is a cost-effective solution, provided the part numbers match exactly.

Donor-vehicle mileage cap: roughly under 100000 miles for the part to have meaningful remaining life.

Donor quality checklist:

• Match the part number exactly. Different production years of the same model use incompatible modules.
• Verify the donor vehicle was not scrapped due to a front-end collision or flood damage.
• Purchase from a seller offering at least a 90-day warranty and a clear return policy.
• Ensure the hydraulic ports were plugged immediately after removal to prevent debris intrusion.

Decision logic:

• If Vehicle is covered by a manufacturer's extended support program (e.g., Toyota ZJB/ZLG) → Use a new OEM part installed by a dealer, as it is free.
• If The original module can be repaired by a mail-in specialty service for under $400 → Rebuild the original part to avoid expensive dealership VIN programming fees.
• If Vehicle is older (>10 years) and a new OEM part costs over $1500 → Buy a used part from a low-mileage donor, but budget for potential repeat labor costs.
• If A remanufactured part is available for a similar price to a used one → Buy the remanufactured part for its longer warranty and tested solenoids.

Warranty tradeoff: Used parts carry a 30-90 day warranty covering only the part. Rebuilt modules offer 1-year to lifetime warranties. New OEM parts have a 1-year warranty.

Worst-case if a used part fails: $300-$600 if a used part fails, representing the repeated labor for removal, installation, and automated brake bleeding.

What Happens If You Wait — Timeline

1. 0-4 weeks: Code sets, ABS and Traction Control lights are on. The systems are disabled, but base braking is normal. No other perceived symptoms. (MPG impact: 0%% · Added cost: $0)
2. 1-6 months: On Toyota/Lexus vehicles, the internal pump motor runs constantly to maintain pressure, creating a buzzing sound and putting a continuous drain on the 12V battery. (MPG impact: 0-1%% · Added cost: $150-$300 (for a new 12V battery killed by parasitic drain))
3. 6-12 months: The module intermittently applies brake pressure to one or more wheels, causing brake drag. This accelerates wear on brake pads and rotors and drops fuel economy. (MPG impact: 5-15%% · Added cost: $250-$700 (for a premature brake job and wasted fuel))
4. 12+ months: The internal pump motor burns itself out completely. The ultimate risk is an accident in an emergency situation where ABS was needed but unavailable. (MPG impact: 5-15%% · Added cost: $1500-$4000+ (for a complete hydraulic unit replacement or accident-related damages))

Cost of Not Fixing It

• Immediate: Loss of ABS and stability/traction control. This results in an increased risk of skidding and longer stopping distances in emergency situations. (Added cost: Negligible)
• 1-6 Months: A failing ABS module causes intermittent, unwanted brake application, leading to poor fuel economy and accelerated wear of brake pads and rotors. A constantly running pump motor drains the 12V battery. (Added cost: $200-$600 (for premature brake job or new battery))
• 6+ Months: Complete failure of the ABS hydraulic unit. The internal pump motor burns out entirely, requiring a full assembly replacement instead of a cheaper component repair. (Added cost: $1500-$3500 (for complete hydraulic unit replacement))

Diagnosis Steps

1. Read Enhanced Manufacturer Codes
   Use an advanced OBD-II scanner to retrieve manufacturer-specific codes (e.g., C1256 on Toyota or C1185 on Ford). A basic $20 scanner only shows the generic C1250, missing the sub-codes required for accurate diagnosis.
   Tools: Advanced OBD-II Scanner (Intermediate)
2. Test Battery and Charging System
   Measure battery voltage with a multimeter. It must be above 12.4V with the engine off and between 13.7V and 14.7V with the engine running. Low voltage triggers false communication errors in the ABS module.
   Tools: Multimeter (Beginner)
3. Check Fuses, Relays, and Fluid
   Verify the brake fluid level is at the 'MAX' line. Inspect all ABS-related fuses under the hood. Swap the ABS power relay with an identical non-critical relay (like the horn) to instantly rule out a relay failure.
   Tools: Multimeter or spare relay (Beginner)
4. Inspect Wiring and Clean Grounds
   Examine the ABS wiring harness for chafing or melting. Locate the main ABS ground wire (often bolted to the frame rail), unbolt it, scrub the contact surfaces to bare metal with a wire brush, and re-secure it tightly.
   Tools: Flashlight, socket set, wire brush (Beginner)
5. Command the ABS Pump
   Use a bidirectional scan tool to command the ABS pump motor 'ON'. If the scanner says the command was sent but the pump remains silent, the internal motor has failed, requiring module replacement or rebuild.
   Tools: Bidirectional OBD-II Scanner (Advanced)
6. Perform a Voltage Drop Test
   With the key on, measure voltage between the battery positive post and the ABS module power pin. A reading above 0.5V indicates high resistance in the power wire. Repeat for the ground circuit (limit 0.2V).
   Tools: Multimeter, vehicle-specific wiring diagram (Advanced)
7. Test CAN Bus Resistance
   Disconnect the battery. Measure resistance between Pin 6 and Pin 14 at the OBD-II port. A healthy network reads 60 ohms. A reading of 120 ohms indicates an open circuit; 0 ohms indicates a shorted network.
   Tools: Multimeter (Advanced)
8. Monitor Live Wheel Speed Data
   Drive slowly while graphing all four wheel speed sensors on a scan tool. All must report identical, smooth speeds. An erratic signal points to a sensor or wiring fault crashing the ABS network.
   Tools: Advanced OBD-II Scanner (Advanced)

When This Code Triggers (Freeze-Frame Conditions)

• Vehicle Speed: 4-40 mph (The code sets during the initial system self-test immediately after starting to drive (above 4 mph) or during low-speed city driving with brake application.)
• System Voltage: Below 11V or Above 15V (The fault triggers when system voltage is unstable, often during engine cranking with a weak battery or if the alternator's voltage regulator fails.)
• Brake Pedal Status: On / Depressed (The fault logs when the brake pedal is pressed, as the ABS module actively monitors sensors and prepares the hydraulic unit.)
• Engine State: Running (The code sets when the engine is running and the ABS module attempts to perform its self-checks or communicate with the CAN bus network.)

Related Codes

• C1241 — Stands for 'Low or High Power Supply Voltage'. Its presence alongside C1250 proves the root cause is a failing battery or alternator, not the ABS module. Always diagnose C1241 first.
• C1251 — Means 'Pump Motor is Locked'. If you have both C1250 and C1251, the internal ABS pump motor has failed. Command the pump on with a scanner; if it makes no sound, replace the actuator.
• C1256 — Means 'Accumulator Low Pressure' on Toyota/Lexus. C1256 indicates the hydraulic accumulator has an internal leak. C1250 is just a secondary code; the actuator assembly requires replacement.
• C1185 — Means 'ABS Power Relay Output Circuit Failure' on Ford vehicles. Its presence strongly suggests the external power relay failed, cutting power to the module. Swap the relay before replacing the module.
• U0121 — Means 'Lost Communication With ABS Control Module'. Points strongly toward a CAN bus wiring issue or a blown main ABS fuse rather than an internal circuit fault.

Climate & Environmental Factors

• Road Salt / Rust Belt Regions: Saltwater brine dramatically accelerates the rusting of vehicle frames and electrical ground points. This is the leading cause of C1250 on GM trucks, where the EBCM ground sits on an exposed frame rail.
• Cold Weather: Extreme cold lowers battery voltage below the module's operating threshold. Moisture inside connectors freezes, expanding and breaking the electrical connection until the vehicle warms up.
• High Humidity / Moisture: Persistent high humidity promotes green corrosion on circuit boards and inside electrical connectors, leading to high resistance and intermittent circuit failures.

How to Talk to a Mechanic About This Code

Say this: "I have an ABS light on and my scanner shows a C1250 code. Before condemning the ABS module, please check for manufacturer-specific codes, test the battery and charging system, and inspect the module's main power, ground, and relay."

This signals you understand that C1250 is often caused by simpler electrical issues. It directs the technician to perform a thorough diagnosis instead of jumping to the most expensive conclusion.

Avoid saying:

• 'My ABS light is on, can you fix it?'
• 'Just replace the ABS module.'
• 'I have a C1250, give me a price for a new ABS computer.'

Questions to ask before authorizing the repair:

• Were there any other manufacturer-specific codes along with the C1250, like C1241, C1185, or C1256?
• What were the exact voltage readings for the battery and alternator?
• Did you perform a voltage drop test on the ABS module's power and ground wires?
• If replacing the module, can you confirm your shop has the software to program it and perform the automated ABS bleed procedure?
• For my Toyota/Lexus, did you check if my VIN is covered by the ZLG/ZJB warranty enhancement program?

Where to Take It: Dealer vs Independent vs Chain

• Dealer: Recommended only if the vehicle is covered by a warranty/customer support program or if a trusted independent is unavailable.
  Best for: Vehicles covered by a manufacturer's specific warranty extension (very common for Toyota/Lexus with this code)., Complex repairs on newer European vehicles requiring proprietary software for programming a new module.
  Downsides: Highest labor rates and part costs., Dealers refuse to install customer-supplied remanufactured parts, pushing for a $2,000+ new unit. (Typical cost: +75% vs. baseline)
• Independent Shop: Best overall fit. An experienced independent technician is the most cost-effective choice for diagnosing and repairing C1250.
  Best for: Out-of-warranty vehicles where cost is a major factor., Diagnosing common issues like the GM ground fault or Ford power relay failure., Shops willing to install remanufactured or rebuilt modules to save costs.
  Downsides: The shop must have an advanced, bidirectional scan tool capable of performing an automated ABS bleed. (Typical cost: +0% vs. baseline)
• Chain Shop: AVOID. This code requires diagnostic expertise beyond the scope of most chain shops. There is a high risk of misdiagnosis.
  Best for: Simple maintenance like oil changes or tire rotations.
  Downsides: Technicians lack the advanced diagnostic equipment needed for complex electrical codes., High pressure to meet sales targets leads to recommending a new module when only a wire is broken. (Typical cost: -10% vs. baseline)

When to Walk Away From the Repair

If the estimated repair cost for the C1250 fault exceeds 40-50% of your car's private-party value, it is not financially sensible to proceed with the repair.

• Car worth $3500, fix is $2200: Walk away. A $2,200 repair on a $3,500 car represents over 60% of its value. It is not a sound investment.
• Car worth $15000, fix is $2500: Fix it. The repair cost is well below the 40% threshold and restores a critical safety feature, preserving the vehicle's value.
• Car worth $4000, fix is $800: Fix it. If the issue is a less expensive fix like a rebuilt module or wiring repair, the cost is easily justified by the car's value.

What Scan Tool You Need for This Code

Minimum: A scanner that reads and clears codes from the ABS module. A basic engine-only code reader is useless for C1250.

To properly diagnose C1250, you need a tool that retrieves manufacturer-specific ABS codes, views live wheel speed data, and performs bidirectional controls to activate the ABS pump motor for testing and bleeding.

Budget: BlueDriver Pro (~$100) — Reads manufacturer-specific ABS codes and views live data from wheel speed sensors. It lacks the bidirectional control needed for ABS pump activation or automated bleeding.

Mid-range: Autel MaxiCOM MK808 / Foxwell NT680 Pro (~$250-400) — The best value for DIYers. Offers full system diagnostics, reads specific ABS codes, graphs live data, and provides bidirectional control to perform an 'automated bleed' which cycles the ABS pump.

Professional: Autel MaxiSys MS906 / Launch X431 Series (~$600-1500) — Provides dealership-level functionality. Includes advanced bidirectional controls, component activation tests, and the ability to code a new ABS module to the vehicle's VIN.

Rent vs buy: Auto parts stores offer free loaner tools, but these are basic scanners that CANNOT read ABS codes. For a one-time complex diagnosis, pay a professional shop's diagnostic fee ($100-$200). Buy a mid-range scanner only if you plan to perform your own repairs.

How to Clear the Code After You Fix It

1. Reconnect the battery if it was disconnected for the repair.
2. Use an advanced OBD-II scan tool to erase the C1250 and related fault codes from the ABS module.
3. Perform the automated ABS system bleeding procedure with a bidirectional scan tool if any hydraulic components were replaced.
4. Perform a 'Zero Point Calibration' for the steering angle and yaw rate sensors if they were replaced.
5. Conduct a drive cycle to allow the system to run its self-test and confirm the fix.

Drive cycle (~15 minutes): 1. Start the engine and let it idle for 2 minutes. 2. Drive straight ahead and accelerate over 25 mph to trigger the ABS initial self-test. 3. Drive for 5-10 minutes, including turns and varied city speeds. 4. Bring the vehicle to a complete stop. 5. Accelerate over 40 mph for at least one minute. If the warning lights remain off, the cycle is complete.

Readiness monitors affected: This is a chassis code (C-code) and does not directly affect emissions readiness monitors. However, disconnecting the battery during repair resets all emissions monitors.

Before emissions retest: drive at least 50 miles to fully set monitors.

Watch out for:

• Disconnecting the battery will not clear the C1250 code from the ABS module's non-volatile memory; a scan tool is mandatory.
• If the root cause remains unfixed, the code returns immediately after being cleared during the 4 mph startup self-test.
• Skipping the automated ABS bleed procedure after replacing the actuator leaves air in the valve body, causing a spongy pedal and immediate return of the code.

Will This Fail Emissions / State Inspection?

No — by itself this code doesn't fail OBD inspection (but it can keep readiness monitors from setting, which causes a separate fail).

• California: An illuminated ABS light does NOT cause a smog check failure. The test only checks emissions-related systems and the Check Engine Light.
• New York: An ABS warning light is not a cause for rejection during the annual safety inspection, though legislation frequently proposes changing this.
• Texas: The vehicle passes the state safety inspection with an ABS light on, provided the primary red 'BRAKE' warning light is not illuminated.

Most Commonly Affected Vehicles

• Toyota Prius (2004-2009) — Extremely common for the brake actuator assembly to fail. Toyota issued Warranty Enhancement Program ZJB extending coverage. Codes C1256 and C1391 are key indicators.
• Lexus IS250, RX400h, GS models (2006-2012) — Shares a similar brake actuator design with Toyota. Lexus issued Warranty Enhancement Program ZLG, extending coverage for the brake actuator assembly to 10 years or 150,000 miles.
• Ford F-150, Explorer (1999-2008) — Prone to internal ABS module circuit failures or ABS power relay failures, triggering a long list of codes including C1250 and C1185.
• Chevrolet / GMC Silverado / Sierra 1500/2500 (1999-2007) — Frequently experiences C1250 due to a corroded ground connection for the EBCM located on the frame rail under the driver's door.
• BMW 3-Series (E90), Z4 (E89) (2006-2013) — The ATE Mk60E DSC/ABS hydraulic unit fails frequently, leading to a trio of brake, ABS, and DSC warning lights. Rebuilding the unit is the standard fix.
• Honda Civic (2022-Present) — Code C1250-98 specifically indicates an overheating issue with the Electric Vacuum Pump Control Unit (EVPU), affecting brake assist performance.

Manufacturer-Specific Notes

• Toyota/Lexus: The code almost always points to a failure of the expensive brake actuator assembly, accompanied by a continuous buzzing sound. Check for Warranty Enhancement Programs (ZLG/ZJB) for free replacements.
• Ford: A large number of ABS circuit codes (C1185, C1194, C1250) appear simultaneously. This points to a single failure in the main power circuit, usually the $20 power relay.
• General Motors (Chevy/GMC): The most likely cause is a corroded ground wire for the EBCM located on the outside of the driver-side frame rail, especially in Rust Belt states.
• Hyundai: On vehicles with Electronic Control Suspension (ECS), C1250 indicates a 'Height Sensor Supply Voltage Failure' and is completely unrelated to the braking system.

Real Owner Stories

2005 GMC Sierra 1500 at 185K miles

ABS and Brake light came on intermittently, especially after driving in rain or snow in Ohio. No other symptoms.

What they tried:

1. Checked fuses, all were good.
2. Scanned codes, got C1250 for EBCM communication failure.
3. Replaced the EBCM with a used unit for $150, but the code returned within a week.

Outcome: The owner located the EBCM ground wire on the frame rail under the driver's door. The bolt was rusted and the connection was corroded. They cleaned the frame and wire terminal to bare metal, applied dielectric grease, and reinstalled with a new bolt. The total cost was under $10, and the lights never returned.

Lesson: On GM trucks from this era, always check the frame ground connection under the driver's side before replacing the expensive EBCM. It is the most common point of failure in the Rust Belt.

2008 Toyota Prius at 140K miles

ABS, VSC, and the red BRAKE light all came on. A loud, continuous buzzing noise was heard from the engine bay, draining the 12V battery overnight.

What they tried:

1. A general mechanic read code C1256 and C1250 and recommended replacing the entire ABS actuator assembly for $3,200.
2. Owner had to jump-start the car multiple times due to the battery drain from the buzzing pump.

Outcome: The owner researched online and found Toyota had a Warranty Enhancement Program (ZJB) for this exact issue. A Toyota dealer confirmed the failure and replaced the brake actuator assembly for free, even though the car was 10 years old.

Lesson: If you own a Toyota or Lexus and have C1250 accompanied by C1256 and a buzzing pump, immediately check for manufacturer warranty extensions. This well-known failure is often a free repair at the dealer.

2006 Ford F-150 at 115K miles

ABS light was on. A basic scanner only showed C1250.

What they tried:

1. Visually inspected wiring to the ABS module.
2. Tested battery and alternator, both were healthy.
3. Replaced the ABS module with a remanufactured one for $350. The light came back on immediately.

Outcome: The owner took the truck to a shop with an advanced scanner, which pulled multiple codes: C1250 and C1185 (ABS Power Relay Circuit Failure). The mechanic swapped the ABS power relay with the horn relay. The ABS light went out immediately. A new $25 relay permanently fixed the problem.

Lesson: A basic scanner is misleading. On Fords, a flurry of ABS codes points to a single power supply issue. If C1185 is present, always test the inexpensive power relay before assuming the module failed.

How to Prevent This Code From Triggering

• Flush brake fluid every 2-3 years or 30,000 miles (Every 2-3 years) — Brake fluid absorbs moisture over time. This moisture corrodes the delicate internal valves and electronic components of the ABS module from the inside out, causing them to seize.
• Clean and protect critical ground points (Once, then inspect every few years) — The ABS module relies on a clean ground connection. Proactively locating the ABS ground, cleaning it to bare metal, and coating it with dielectric grease prevents corrosion-induced communication failures.
• Ensure a healthy battery and charging system (Test annually) — The ABS module requires stable voltage to operate. A weak battery provides erratic power, causing the module to log communication faults like C1250.
• Perform an 'ABS bleed' with a scan tool during fluid flushes (During brake fluid flush) — Standard bleeding doesn't cycle old fluid out of the ABS pump. Using a scan tool to activate the ABS pump during a flush ensures 100% of the moisture-laden fluid is replaced.

Frequently Asked Questions

Is it safe to drive with code C1250?

Yes, but exercise extreme caution. Your anti-lock brakes and stability control are disabled, meaning wheels will lock up during a panic stop. Leave extra following distance and avoid driving in wet or icy conditions.

What is the most common misdiagnosis for C1250?

Mechanics often replace the expensive ABS module without checking the battery, alternator, or ground wires first. Low voltage or a corroded $5 ground bolt frequently triggers this code. Always verify power and ground integrity before condemning the module.

Does a new ABS module require programming?

Yes, most modern vehicles require a new ABS module to be programmed with the vehicle's VIN using a factory-level scan tool. This ensures it communicates correctly with the ECU. Using a mail-in rebuild service for your original module bypasses this requirement.

Will clearing the code fix the problem?

No. C1250 indicates a hard electrical fault or hardware failure. The warning lights return immediately after clearing as soon as the ABS module runs its 4 mph startup self-test.

Can I fix a C1250 code myself?

You can easily perform basic checks like testing the battery, replacing relays, and cleaning ground wires. However, replacing the ABS hydraulic unit requires a bidirectional scan tool to perform an automated brake bleed, making it a professional-level job.

Why is the repair so expensive?

The ABS actuator assembly combines a computer, a high-pressure hydraulic pump, and solenoid valves into one unit. New OEM units cost over $1,500 for the part alone. Labor and specialized bleeding procedures add several hundred dollars.

My mechanic quoted $3,000 to fix my Prius. Is that normal?

Yes, $2,500 to $3,500 is the standard dealership rate for a new OEM brake actuator assembly. Save money by asking an independent shop to install a remanufactured unit. Also, verify if your VIN is covered by Toyota's ZJB warranty enhancement program.

Can a bad wheel speed sensor cause C1250?

A failed wheel speed sensor typically sets a specific code (like C0035), but a dead short in the sensor's wiring occasionally crashes the ABS network, triggering C1250.

Key Takeaways

• Test your battery and charging system first, ensuring voltage is above 12.4V off and 13.7V running, as low voltage triggers C1250 before any hardware actually fails.
• Clean the ABS module's frame ground connection to bare metal, which fixes over 80% of C1250 codes on 1999-2007 GM trucks for under $10.
• Check your VIN against Toyota/Lexus Warranty Enhancement Programs ZJB or ZLG, which cover the $2,500+ brake actuator replacement for 10 years or 150,000 miles.
• Use a mail-in ABS module rebuild service for $150-$400 instead of buying a new $1,500+ OEM unit, which also avoids expensive dealership VIN programming fees.