OBD-II Code C0287: Longitudinal Acceleration Sensor Circuit Fault

What Does C0287 Mean?

Code C0287 signifies the Electronic Brake Control Module (EBCM) detects a fault in the Longitudinal Acceleration Sensor circuit. This sensor measures forward and backward motion, providing critical data for Electronic Stability Control (ESC), Anti-lock Brakes (ABS), and All-Wheel Drive (AWD). When the EBCM receives invalid or missing data, it triggers C0287 and disables these safety systems.

Technical definition: The SAE/ISO standard reserves C0287 for manufacturer-specific definitions. For General Motors, it indicates the EBCM received invalid, implausible, or missing data from the Longitudinal Acceleration Sensor. Professional scan tools read a secondary 'symptom byte' (like 4B, 5A, or 71) detailing the exact failure, such as 'Calibration Not Learned' or 'Invalid Data'.

Can I Drive With C0287?

Yes, But With Caution. You can drive, but with extreme caution. Your Anti-Lock Brake (ABS) and Electronic Stability Control (ESC/StabiliTrak) systems are completely disabled. This increases the risk of wheel lock-up during emergency stops and fishtailing on slippery surfaces. On vehicles like the Chevrolet Camaro, it also disables power steering, making low-speed maneuvers difficult.

Common Causes

• Faulty Multi-Axis / Yaw Rate Sensor (Very Common) — The longitudinal acceleration sensor is integrated into the Multi-Axis or Yaw Rate Sensor. This unit fails internally due to age or electronic degradation, sending corrupt data to the EBCM.
• Corroded Wiring or Connector X411 (Common) — The wiring harness or connector going to the sensor corrodes or breaks, interrupting the signal. This is heavily documented on 2010-2017 Chevrolet Equinox and GMC Terrain vehicles at connector X411, located under the rear of the vehicle.
• Weak 12V Battery (Common) — Low system voltage causes widespread communication errors between modules. This frequently triggers false C0287 codes on hybrid vehicles like the Chevrolet Volt, which are highly sensitive to 12V auxiliary battery health.
• Sensor Calibration Not Performed (Less Common) — If the Multi-Axis Sensor or EBCM is replaced or disturbed, the sensor requires calibration using a bidirectional scan tool. Skipping this 'Yaw Rate Sensor Learn' procedure immediately sets code C0287 with symptom byte 4B.
• Incorrect Sensor Mounting or Physical Shock (Less Common) — The sensor must be bolted down securely and perfectly flat on its bracket. Improper mounting after a repair, or a severe physical impact to the floor pan, causes the sensor to report implausible data.
• Software or Firmware Glitch (Rare) — Transporting the vehicle on a tow truck with the ignition on sets false plausibility codes. A module 'sleep' cycle or a dealer-installed firmware update resolves these phantom codes.
• Faulty Electronic Brake Control Module (EBCM) (Rare) — The control module itself fails and misinterprets sensor data. This is the absolute last item to consider after confirming the sensor, wiring, and battery are fully functional.

Symptoms

• ABS Light On — The Anti-Lock Brake System warning light illuminates permanently on the dashboard.
• Stability Control Light On — The ESC/StabiliTrak warning light illuminates, accompanied by a 'Service StabiliTrak' or 'Service ESC' message.
• ABS and Stability Control Disabled — Safety systems do not intervene on slippery surfaces. Wheels lock up during hard stops, and the vehicle is prone to skidding.
• Power Steering Disabled — On models like the 2011-2015 Chevrolet Camaro, this fault triggers a 'Service Power Steering' message and disables power steering assist.
• All-Wheel Drive (AWD) Disabled — On the GMC Terrain and Chevy Equinox, the stability system fault disables the AWD system, triggering a 'Service AWD' message.
• Regenerative Braking Disabled — On hybrid vehicles like the Chevy Volt, this fault disables regenerative braking, reducing energy efficiency and altering deceleration feel.

Diagnostic Flowchart

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

Common Fixes & Costs

• Replace Multi-Axis / Yaw Rate Sensor — Parts: $80-$350, Labor: $150-$400, ~2 hr book time (Professional)
• Repair Wiring Connector X411 — Parts: $20-$80, Labor: $150-$350, ~2.5 hr book time (Intermediate)
• Replace 12V Battery — Parts: $150-$300, Labor: $50-$100, ~0.5 hr book time (DIY)
• Perform Sensor Calibration — Parts: $0, Labor: $100-$200, ~1 hr book time (Professional)
• Reprogram EBCM — Parts: $0, Labor: $150-$300, ~1 hr book time (Professional)
• Replace Electronic Brake Control Module (EBCM) — Parts: $600-$1200, Labor: $150-$300, ~1.5 hr book time (Professional)

Used vs. New Parts: Buying Guide

When a used part is worth it: A used sensor from a low-mileage vehicle is cost-effective for older cars where budget is the primary concern.

Donor-vehicle mileage cap: roughly under 80000 miles for the part to have meaningful remaining life.

Donor quality checklist:

• Verify donor mileage and salvage reason.
• Match the part number EXACTLY.
• Avoid parts from flood-damaged or rust-belt vehicles.
• Ensure a 30-90 day warranty.

Decision logic:

• If Vehicle is newer or has under 80k miles → Buy a new OEM or high-quality aftermarket part for long-term reliability.
• If Vehicle has over 150k miles and budget is tight → Buy a tested, used part from a reputable source.
• If Labor cost for replacement is high (sensor deep in console) → Buy a new part to avoid paying labor twice if the used part fails.

Warranty tradeoff: Used parts offer 30-90 days. New aftermarket offers 1-year to lifetime. New OEM offers 1-2 years.

Worst-case if a used part fails: $800 to replace a failed used part and pay labor twice.

What Happens If You Wait — Timeline

1. Immediate: EBCM disables ABS and StabiliTrak. Warning lights illuminate. (MPG impact: 0-5%% · Added cost: $0)
2. 1 week - 2 months: Increased risk of loss of control. Disabled regenerative braking on hybrids decreases efficiency. (MPG impact: 5-15%% · Added cost: $50)
3. 2-6 months: Wiring corrosion spreads to other pins, causing AWD or wheel speed sensor failures. (MPG impact: 5-15%% · Added cost: $500)
4. 6+ months: Vehicle fails state safety inspections. High risk of preventable accidents. (MPG impact: 5-15%% · Added cost: Thousands in accident damages)

Cost of Not Fixing It

• Immediate: ABS and Stability Control systems are disabled. Increased risk of wheel lock-up and loss of control. (Added cost: $0)
• 0-6 Months: Continued risk of a preventable accident. Disabled regenerative braking on hybrids decreases energy efficiency by 5-15%. (Added cost: $50 in wasted fuel)
• 6+ Months: Vehicle fails state safety inspections. Wiring corrosion spreads to other pins, causing AWD or wheel speed sensor failures. (Added cost: $500 for expanded wiring repairs)

Diagnosis Steps

1. Read Fault Codes and Symptom Bytes
   Use an OBD-II scanner capable of reading Chassis (C) codes. Record C0287 and any 2-digit symptom byte (e.g., 71, 5A, 4B) to determine if the issue is invalid data, implausibility, or missing calibration.
   Tools: OBD-II Scanner (with Chassis and GM-specific code capability) (Beginner)
2. Check 12V Battery Health
   Test the vehicle's 12V battery. Ensure resting voltage is above 12.4V and it passes a load test. A weak battery causes random communication codes, especially on the Chevrolet Volt.
   Tools: Multimeter, Electronic Battery Tester (Beginner)
3. Inspect Connector X411 and Wiring
   Inspect the wiring harness leading to the Multi-Axis Sensor. On GM SUVs (Equinox/Terrain), locate connector X411 under the rear of the vehicle and check for green or white corrosion.
   Tools: Flashlight, Trim Removal Tools (Intermediate)
4. Analyze Live Sensor Data
   Access the EBCM live data stream. With the car stationary on a level surface, longitudinal, lateral, and yaw rate values must read near zero. If the longitudinal reading is stuck or reads 'invalid', the sensor has failed internally.
   Tools: Advanced Scan Tool (with live data stream) (Advanced)
5. Test Sensor Circuit Power and Ground
   Disconnect the sensor and turn the ignition ON. Probe the harness connector for reference voltage (>11V) on the power pin and verify continuity to chassis ground (<5 ohms) on the ground pin.
   Tools: Multimeter, Vehicle-specific wiring diagram, Back-probe kit (Advanced)
6. Check CAN Bus Resistance
   With the battery disconnected, measure resistance between Pin 6 (CAN High) and Pin 14 (CAN Low) at the DLC. A healthy bus reads 60 Ω. A reading of 120 Ω indicates a broken wire or disconnected module.
   Tools: Multimeter (Advanced)
7. Analyze CAN Bus Waveform
   Connect an oscilloscope to the high-speed CAN bus. Healthy CAN lines show mirrored square-wave patterns. Distorted or flat-lined waveforms indicate a wiring short or a module corrupting the network.
   Tools: Oscilloscope, DLC Breakout Box (Professional)
8. Perform Sensor Calibration
   If the sensor is replaced, execute the 'Yaw Rate Sensor Learn' procedure using a bidirectional scan tool. Skipping this step guarantees the C0287 code returns immediately.
   Tools: Professional-grade Scan Tool (Professional)

When This Code Triggers (Freeze-Frame Conditions)

• Vehicle Speed: 25-60 mph (Sets during steady-state driving on a level surface.)
• Engine RPM: 1200-2500 RPM (Typical engine speed during city or highway cruise.)
• System Voltage: 11.5V - 14.5V (Low voltage triggers the code on startup; normal voltage triggers it during driving.)
• Steering Angle: 0° (Triggers when driving straight, as implausible sensor data conflicts with the zero-degree steering angle.)

Related Codes

• C0186 — Indicates a Lateral Accelerometer fault. Seeing C0186 and C0287 together confirms the entire Multi-Axis Sensor unit or its shared wiring has failed.
• C0196 — Indicates a Yaw Rate Sensor fault. Seeing C0196, C0186, and C0287 together guarantees a total failure of the sensor assembly or its connector.
• U0125 — Means 'Lost Communication With Multi-axis Sensor'. C0287 means bad data; U0125 means no data. U0125 points directly to a severed wire or heavily corroded connector.
• U0077 — Indicates a communication breakdown on the Chassis Expansion Bus. Suggests a major wiring issue affecting multiple modules, not just the sensor.

Climate & Environmental Factors

• High Humidity and Road Salt: Moisture and salt accelerate corrosion in exposed connectors like the X411 on the Equinox and Terrain, causing a massive failure rate in the 'Salt Belt'.
• Extreme Cold: Cold temperatures reduce battery efficiency. A weak battery provides insufficient voltage to power control modules on startup, triggering false StabiliTrak faults.

How to Talk to a Mechanic About This Code

Say this: "I have a 'Service StabiliTrak' light and a C0287 code. Please check the specific symptom byte and inspect for wiring corrosion before quoting a sensor replacement. If replacing the sensor, ensure your estimate includes the mandatory calibration."

Signals you are informed, directs them to common wiring issues, and ensures they possess the bidirectional tool required for calibration.

Avoid saying:

• 'My ABS light is on, can you just fix it?'
• 'I need a new StabiliTrak sensor.'
• 'Just do whatever you think is necessary.'

Questions to ask before authorizing the repair:

• What is the specific symptom byte associated with the C0287 code?
• Did you load-test the 12V battery?
• Did you visually inspect the wiring harness for corrosion?
• Does your estimate include the 'Yaw Rate Sensor Learn' calibration?

Where to Take It: Dealer vs Independent vs Chain

• Dealer: A safe but expensive choice. Guaranteed to have the correct calibration tools.
  Best for: Vehicles under warranty, Complex firmware updates
  Downsides: Highest labor rates., Defaults to replacing parts rather than repairing wiring. (Typical cost: +50% vs. baseline)
• Independent Shop: Best overall fit. Offers the best balance of expertise and value, provided they can perform the calibration.
  Best for: Out-of-warranty vehicles., Diagnosing common wiring problems.
  Downsides: Must verify they own a bidirectional scan tool capable of sensor calibration. (Typical cost: +0% vs. baseline)
• Chain Shop: Avoid. They cannot perform the mandatory calibration required to fix this code.
  Best for: Routine maintenance like oil changes and tires.
  Downsides: Lacks specialized training for electronic diagnostics., Lacks bidirectional scan tools for calibration. (Typical cost: -10% vs. baseline)

When to Walk Away From the Repair

If the repair cost exceeds 50% of the car's value, evaluate its overall condition. However, because C0287 disables critical safety systems, the threshold to repair should be higher.

• Car worth $6000, fix is $750: Fix it. Restores critical safety systems for a fraction of the car's value.
• Car worth $3000, fix is $750: Fix it. Driving without ABS is a major safety risk. Get a second opinion to confirm costs.
• Car worth $2000, fix is $1500: Walk away. Repair cost approaches the car's value.

What Scan Tool You Need for This Code

Minimum: An OBD-II scanner that reads Chassis (C) codes and displays live sensor data.

Basic $20 readers cannot see Chassis codes. You need live data to diagnose the sensor and bidirectional control to calibrate a new one.

Budget: OBD Fusion (App) with compatible OBD-II adapter (~$50) — Reads C-codes and displays live data for diagnosis. Cannot perform calibration.

Mid-range: Foxwell NT510 Elite for GM (~$180) — Reads symptom bytes, graphs live data, and performs the mandatory 'Yaw Rate Sensor Learn' calibration.

Professional: Autel MaxiCOM MK808S (~$450) — Offers OE-level diagnostics, live data graphing, and easy-to-follow calibration procedures.

Rent vs buy: Rent a basic scanner for initial diagnosis. Buy a bidirectional tool (like Foxwell) if you plan to replace and calibrate the sensor yourself.

How to Clear the Code After You Fix It

1. Reconnect the 12V battery.
2. Use an OBD-II scan tool to clear the Chassis (C) fault codes.
3. Perform the mandatory 'Yaw Rate Sensor Learn' procedure with a bidirectional scan tool.
4. Perform a complete GM drive cycle to allow the system to self-test.

Drive cycle (~20 minutes): From a cold start, idle for 3 minutes. Accelerate to 55 mph for 5 minutes. Coast down to 20 mph without braking. Accelerate to 55 mph for 5 minutes. Stop. This completes EBCM self-tests.

Readiness monitors affected: Catalyst monitor, Evaporative System monitor, O2 Sensor monitor

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

Watch out for:

• Clearing the code without fixing the hardware guarantees immediate return.
• Forgetting the sensor calibration sets code C0287 4B instantly.
• Disconnecting the battery resets emissions monitors, causing a failed smog test.

Will This Fail Emissions / State Inspection?

Yes — this code typically fails an OBD-II emissions inspection.

• California: An ABS light does not fail the emissions test. However, clearing the code resets OBD-II monitors, causing an automatic failure for 'not ready'.
• New York: An illuminated ABS light is a direct failure of the mandatory safety inspection.
• Texas: An illuminated ABS warning light causes an automatic failure of the safety inspection.

Most Commonly Affected Vehicles

• Chevrolet Equinox (2010-2017) — Extremely prone to corrosion in the X411 wiring connector under the rear of the vehicle. See GM TSB PIT5427A.
• GMC Terrain (2010-2017) — Shares the Equinox platform and the identical X411 connector failure rate.
• Chevrolet Cruze (2011-2015) — Internal failure of the Multi-Axis Acceleration Sensor under the center console is the primary cause.
• Chevrolet Volt (2011-2015) — A weak 12V auxiliary AGM battery is the most frequent root cause of this code and must be tested first.
• Chevrolet Camaro (2011-2015) — This code disables power steering as a safety precaution. The fault is almost always the Multi-Axis sensor (P/N 23483148).
• Buick Regal (2011-2017) — Caused by a failed Multi-Axis sensor or communication issues on the Chassis Bus wiring network.
• GMC Yukon / Yukon XL (2007-2014) — A failed combination yaw/lateral/longitudinal accelerometer sensor under the front passenger seat triggers this code.
• Saab 9-4X (2011-2011) — Built on the GM Theta Premium platform, it uses the identical Multi-Axis Acceleration Sensor and shares GM diagnostic procedures.

Manufacturer-Specific Notes

• General Motors: Diagnosis relies heavily on the 'symptom byte' (71, 5A, 4B) read by a professional scan tool. GM TSBs PIT5427A and PIT5187A acknowledge widespread connector and sensor faults.
• Ford: C0287 aligns with a generic 'ABS valve relay circuit' definition. Diagnosis focuses on testing the ABS module's power relay and wiring, not the G-sensor.
• Honda: C0287 is not standard. Similar VSA light symptoms point to internal VSA modulator-control unit problems.
• Stellantis (Chrysler/Dodge/Jeep): C0287 is rarely used. Stability issues trigger U-series codes pointing to lost communication with the Dynamics Sensor.
• Subaru: Subaru uses C0071 or C1711 for equivalent Vehicle Dynamics Control (VDC) sensor failures, requiring a 'VDC Sensor Centering' procedure after repair.

Real Owner Stories

2013 Chevy Equinox at 110K miles - The Classic X411 Corrosion

Owner experienced permanent 'Service StabiliTrak' and 'Service AWD' messages after a rainstorm. Codes C0287, C0196, and U0074 were present.

What they tried:

1. Shop quoted $800 to replace the Multi-Axis sensor.
2. Owner found GM TSB PIT5427B detailing connector X411 corrosion.
3. Owner inspected connector X411 and found heavy green corrosion.

Outcome: Owner cleaned the X411 connector pins with contact cleaner and applied dielectric grease. All codes cleared permanently. Total cost: $20.

Lesson: On a 2010-2017 Equinox or Terrain, always inspect the X411 connector for corrosion before replacing parts. It is the most common cause.

2012 Chevy Camaro SS at 75K miles - The Misleading Power Steering Failure

'Service StabiliTrak' and 'Service Power Steering' messages appeared simultaneously. Power steering assist failed. Code C0287 71 was stored.

What they tried:

1. Owner suspected a failed power steering pump.
2. Live data showed the longitudinal G-sensor value was frozen and invalid.

Outcome: An independent shop replaced the Multi-Axis Sensor and performed the 'Yaw Rate Sensor Learn'. StabiliTrak and power steering were restored. Total cost: $650.

Lesson: On the Camaro, a C0287 fault disables power steering electronically. Do not replace hydraulic steering components before diagnosing chassis codes.

2014 Chevy Volt at 95K miles - The Simple Battery Fix

Car displayed 'Service StabiliTrak' and refused to enter 'Ready' mode. Code C0287 and multiple U-codes were present.

What they tried:

1. Owner jump-started the car, but faults remained.
2. Multimeter check showed 12V battery resting at 10.5V.

Outcome: Owner replaced the 12V AGM battery in the trunk. All fault codes disappeared permanently. Total cost: $220.

Lesson: On hybrids like the Chevy Volt, a weak 12V battery causes widespread electronic faults. Always load-test the battery first.

2011 Buick LaCrosse at 120K miles - The Calibration Trap

Shop replaced the Multi-Axis sensor to fix C0287 71. The 'Service StabiliTrak' light returned immediately upon pickup.

What they tried:

1. Shop rescanned the car and found code C0287 4B 'Calibration Not Learned'.

Outcome: The shop performed the forgotten 'Yaw Rate Sensor Learn' procedure with their scan tool. The code cleared. Total cost: $0 (shop error).

Lesson: Replacing the sensor requires a mandatory calibration. Ensure your shop has the bidirectional tool to perform this step.

How to Prevent This Code From Triggering

• Apply Dielectric Grease to Connectors (Once) — Packing exposed connectors (like X411) with dielectric grease seals out moisture and prevents corrosion.
• Perform Underbody Washes (Monthly during winter) — Removes road salt and brine from wiring harnesses, slowing corrosion.
• Test 12V Battery Health (Annually) — Identifies weakening batteries before they trigger random electronic faults.
• Apply Undercoating (Annually) — Provides a physical barrier protecting wiring from salt, moisture, and rodents.

Frequently Asked Questions

Can I reset the ABS light myself?

You can clear the code with an OBD-II scanner, but the light returns immediately if the underlying problem remains. Disconnecting the battery is not a permanent repair. You must fix the hardware or wiring issue first.

My mechanic says C0287 is a camshaft sensor code. Is that right?

No, that is incorrect for most vehicles, especially GM. C0287 is a Chassis ('C') code related to the brake and stability control system, not a Powertrain ('P') code for the engine. A scanner reporting C0287 for a camshaft issue is misinterpreting the data.

Why did the light come on right after I replaced the sensor?

The new sensor requires calibration to the vehicle's EBCM. This procedure, called a 'Yaw Rate Sensor Learn,' requires a bidirectional scan tool. Skipping this step immediately sets code C0287 with a '4B' symptom byte.

What does the symptom byte 'C0287 71' or 'C0287 5A' mean?

These are manufacturer-specific extensions read by professional scan tools. '71' means 'Invalid Data,' pointing to an internal sensor failure. '5A' means 'Not Plausible,' indicating the sensor's data conflicts with other vehicle sensors, while '4B' means 'Calibration Not Learned'.

The light came on after my car was towed. What should I do?

The code is likely a false positive. Transporting a vehicle with the ignition on confuses the stability system and sets plausibility faults. Clear the code with a scanner and test drive; if it stays off, no repair is needed.

My mechanic wants to replace the whole ABS module. Is that necessary?

It is highly unlikely. A faulty ABS/EBCM module is a rare cause of this specific code. Always diagnose and rule out the multi-axis sensor and its wiring before replacing the expensive EBCM.

What is a Multi-Axis Sensor?

It is an electronic module containing longitudinal, lateral, and yaw rate sensors. Your car's computer uses this combined data to detect skids, spins, or rolls. It then activates the stability control system to help you maintain control.

What is the CAN bus and why is it important for C0287?

The Controller Area Network (CAN bus) is the communication network connecting your car's computers. The Multi-Axis Sensor sends data to the EBCM over this network. Diagnosing the CAN bus determines if the fault lies in the sensor, the wiring, or the module.

Can a bad wheel alignment cause code C0287?

A bad alignment does not directly cause code C0287. However, failing to reset the steering angle sensor after an alignment creates conflicting data for the EBCM. This conflict triggers a 'Not Plausible' (5A) fault.

Key Takeaways

• Code C0287 is a critical safety fault that completely disables your ABS and StabiliTrak systems, increasing emergency stopping distances.
• On 2010-2017 GM SUVs like the Equinox, inspect the X411 wiring connector for corrosion before replacing any parts; it causes over 50% of these faults.
• Replacing the Multi-Axis Sensor requires a mandatory 'Yaw Rate Sensor Learn' calibration using a $150+ bidirectional scan tool to function.
• Always load-test the 12V battery first, especially on hybrids like the Chevy Volt, as a resting voltage below 12.4V triggers false C0287 codes.