OBD-II Code C1568: Electric Power Steering Converter Malfunction

What Does C1568 Mean?

Code C1568 signifies the vehicle's main computer identified a critical malfunction in the Electric Power Steering (EPS) DC-DC converter. This converter transforms standard 12V battery voltage into the higher voltage (42V or more) required by the electric steering motor. When triggered, the system enters fail-safe mode and shuts off all power steering assist, resulting in an immediately heavy steering wheel.

Technical definition: The SAE/ISO definition is 'DC-DC Converter Malfunction' within the EPS system. The Power Steering ECU sets this code when it detects an internal circuit failure preventing the converter from supplying specified voltage to the EPS motor. The system immediately cuts all power assistance to ensure predictable, albeit unassisted, steering.

Can I Drive With C1568?

Yes, But With Caution. You can physically drive, but the complete loss of power steering requires 2 to 3 times the normal effort to turn the wheel. This makes emergency maneuvers and low-speed turns extremely dangerous. While driving won't cause further component damage, it dramatically increases accident risk. Tow the vehicle to a qualified shop.

Common Causes

• Water-Damaged Power Steering Converter (DC-DC Converter) (Very Common) — This is the root cause in the vast majority of cases. The converter is often located under the battery tray, making it highly susceptible to water runoff from the windshield cowl. Moisture seeps into the housing or connectors, causing severe corrosion, short circuits, and complete module failure.
• Damaged Wiring or Corroded Grounds (Common) — Wiring harnesses connecting the battery, Power Steering ECU, and converter suffer from chafing, breaks, or corrosion. Loose or corroded ground straps introduce high resistance, interrupting power flow or critical command signals.
• Blown High-Amperage EPS Fuses (Less Common) — Specific high-current fuses (labeled 'EPS', 'P/S', or 'DDC') protect the system. A blown fuse instantly cuts power to the converter. However, a blown fuse is usually a symptom of a shorted converter drawing excessive current, not the root cause.
• Failed Power Steering ECU (Less Common) — The main Power Steering ECU fails internally and stops sending the 'turn-on' command to the converter. It erroneously logs a C1568 code even if the converter is functional. A burnt electronics smell inside the cabin strongly indicates ECU failure.
• Hybrid System High-Voltage Fault (Rare) — On hybrid models (e.g., RX400h), the EPS converter relies on the main high-voltage battery pack. A fault preventing the high-voltage battery from coming online starves the EPS converter of input power, triggering C1568.
• Inhibiting ECU Safety Logic (Rare) — The Power Steering ECU intentionally disables the converter if it receives conflicting data from the Vehicle Stability Control (VSC) or Hybrid Control System. This logs C1568 without a direct hardware fault in the EPS power circuit.

Symptoms

• Complete and Sudden Loss of Power Steering — The steering wheel becomes extremely heavy, requiring significant physical effort to turn, especially at low speeds.
• Power Steering (P/S or EPS) Warning Light On — A dedicated warning light showing 'P/S' or 'EPS' illuminates on the instrument cluster.
• Intermittent Power Steering Failure — Power assist cuts out during a drive, returns on the next ignition cycle, and fails again minutes later. This is an early warning of a failing converter or loose connection.
• Multiple Warning Lights Activated — Network communication issues stemming from the electrical fault trigger ABS, VSC, or general 'Check System' warnings simultaneously.
• DTC C1568 Stored in EPS Module (scan-tool only — no driver-felt sign) — The specific Diagnostic Trouble Code C1568 logs in the Electric Power Steering control module memory.

Diagnostic Flowchart

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

Common Fixes & Costs

• Replace the Power Steering Converter — Parts: $75-$250 (Used OEM Parts-Only), Labor: $200-$400 (Labor-Only), ~2 hr book time (Intermediate)
• Repair Damaged Wiring or Connectors — Parts: $20-$75 (Parts-Only), Labor: $150-$500 (Labor-Only), ~2.5 hr book time (Advanced)
• Replace Blown EPS Fuse/Fusible Link — Parts: $15-$50 (Parts-Only), Labor: $50-$150 (Labor-Only), ~0.5 hr book time (DIY)
• Replace the Power Steering ECU — Parts: $400-$800 (Used), $1300-$1700 (New OEM), Labor: $100-$200 (Labor-Only), ~1 hr book time (Professional)

Used vs. New Parts: Buying Guide

When a used part is worth it: For the Power Steering Converter, a used OEM part is the best choice. New OEM parts are expensive or discontinued, and aftermarket options are rare. A used converter from a reputable dismantler is a reliable, plug-and-play solution.

Donor-vehicle mileage cap: roughly under 120000 miles for the part to have meaningful remaining life.

Donor quality checklist:

• Match the OEM part number exactly.
• Critically inspect electrical connectors for green/white corrosion, bent pins, or melted plastic.
• Purchase from a seller offering a 30-90 day warranty who confirms the part was tested.
• Ensure the donor vehicle was not scrapped due to flood or fire damage.

Decision logic:

• If The fault is confirmed to be the Power Steering Converter → A tested, used OEM part with a clean connector and a warranty is the most economical option.
• If The fault is confirmed to be the Power Steering ECU → Consider a professional 'Repair & Return' service for your original ECU. If buying a replacement, a used ECU requires a Zero Point Calibration.
• If The vehicle is a late-model with low mileage and under warranty → Use new OEM parts installed by a dealer to maintain the warranty.

Warranty tradeoff: Used parts typically come with a 30-90 day warranty. New OEM parts have a 1-year warranty. Remanufacturing services often provide a lifetime warranty on the repair work.

Worst-case if a used part fails: $250-$600 if a used part fails after the warranty period, primarily due to repeated labor costs.

What Happens If You Wait — Timeline

1. First Occurrence: Power steering fails to initialize on startup but works after restarting the car. The issue is intermittent. (MPG impact: 0%% · Added cost: $0. This is the warning stage.)
2. Weeks to Months: Failures become frequent. Steering cuts out during low-speed maneuvers. Restarting the car usually restores function temporarily. (MPG impact: 0%% · Added cost: $50-$150 in potential wasted diagnostic fees if a shop cannot replicate the intermittent problem.)
3. Months: Power steering is permanently inoperative. The 'P/S' light stays on constantly. The steering is consistently heavy and dangerous. (MPG impact: 0%% · Added cost: $200+. The risk of an accident is constant. The cost of the inevitable repair is now fixed.)
4. 6+ Months of Inoperation: No further damage to the EPS system occurs. The primary consequence is the severe safety hazard of operating a vehicle with unassisted steering. (MPG impact: 0%% · Added cost: Potential for thousands in collision damage or injury-related costs.)

Cost of Not Fixing It

• Immediate: Significantly increased risk of an accident. Sudden loss of assist makes the steering wheel extremely heavy, hindering emergency evasive maneuvers. (Added cost: Potential for collision-related damages, insurance claims, and injury.)
• Short-Term (Days to Weeks): Extreme driver fatigue and strain. The physical effort required for turning makes driving exhausting and unsafe. (Added cost: Negligible component damage. The system is in fail-safe mode; continued driving does not harm EPS components.)
• Long-Term (Months): No further component damage occurs. The primary cost remains the persistent and serious safety hazard of driving without power steering assist. (Added cost: The eventual repair of the EPS system. Ignoring C1568 does not cause cascading damage to unrelated systems.)

Diagnosis Steps

1. Scan for All Trouble Codes
   Read codes from all vehicle modules using a professional-grade OBD-II scanner. Note codes from the EPS, ABS, and Hybrid modules. Resolve codes like C1241 (Low Voltage) or C1532 (ECU Malfunction) first, as they provide critical diagnostic direction.
   Tools: OBD-II Scan Tool (with multi-system support) (Beginner)
2. Verify Battery and Charging System Health
   A weak battery causes low system voltage, triggering false codes. Test the 12V battery with a multimeter (should read ~12.6V off). With the engine running, charging voltage must be 13.7V-14.7V. Resolve any C1241 (Low Voltage) code before proceeding.
   Tools: Multimeter (Beginner)
3. Inspect EPS Fuses and Fusible Links
   Inspect all high-amperage (50A-80A) fuses related to the EPS system in the engine bay and cabin fuse boxes. Look for labels like 'EPS', 'P/S', or 'DDC'. A blown fuse indicates a short circuit in the converter.
   Tools: Fuse Puller or Pliers, Flashlight (Beginner)
4. Perform Detailed Visual Inspection
   Locate the Power Steering Converter (often under the 12V battery tray). Remove the battery and tray. Inspect the converter and connectors for water damage, green/white corrosion, or burnt plastic. Check the wiring harness for chafing.
   Tools: Socket Set, Flashlight (Intermediate)
5. Check for 12V Power at the Converter
   Disconnect the converter's input connectors. Verify the main power wire has a constant 12V supply from the battery. Check that the ignition 'IG' wire receives 11-14V when the car is switched to 'ON'. Lack of power points to a fuse or wiring issue.
   Tools: Multimeter, Service Manual (Advanced)
6. Pro Tip: The 'Forced Activation' Test (42V Output Test)
   Disconnect the ECU connector. Identify the command wire going from the ECU to the converter. Apply 12V directly to this pin on the converter side using a fused jumper wire. Check the output wire from the converter to the ECU. If it reads the specified high voltage (e.g., 42V), the converter is good and the ECU is bad. If it reads 0V, the converter is faulty.
   Tools: Multimeter, Fused Jumper Wire, Service Manual with Wiring Diagrams (Professional)
7. Pro Tip: Hybrid High-Voltage Input Check
   On hybrid models, the converter requires high-voltage input from the main hybrid battery. With the vehicle in 'READY' mode, a trained technician must verify the presence of high voltage (e.g., 288V DC) at the converter's input terminals. Absence of voltage indicates a main hybrid relay fault.
   Tools: CAT III-rated Multimeter, High-Voltage Safety Gloves, Service Manual (Professional)
8. Check Converter Output Voltage at ECU
   Check the expected voltage from the converter directly at the Power Steering ECU. With the engine switch ON, measure voltage between the specific power terminal and body ground. Absent or incorrect voltage points to a faulty converter or wiring issue.
   Tools: Multimeter, Service Manual with Connector Pinouts (Advanced)
9. Check Network Resistance (CAN Bus)
   If multiple unrelated codes are present, check the communication network. With the battery disconnected, measure resistance between CAN High (Pin 6) and CAN Low (Pin 14) at the OBD-II port. A reading of 120 ohms suggests a module is offline; 60 ohms is healthy.
   Tools: Multimeter, Service Manual (Advanced)
10. Check Harness and Connector Resistance
    With all components disconnected, measure resistance between the ECU's output pin and the converter's input pin. It must be below 1 Ω. Resistance between that pin and body ground must be 10 kΩ or higher to ensure no short to ground exists.
    Tools: Multimeter, Service Manual with Wiring Diagrams (Advanced)

When This Code Triggers (Freeze-Frame Conditions)

• Vehicle Speed: 0-15 mph (The fault triggers during low-speed maneuvers, like parking, when the demand for steering assist is highest.)
• System Voltage: 11-14V (The code sets with normal system voltage present, indicating the issue is a failure within the EPS power circuit itself, not a weak battery.)
• Engine/Hybrid System Status: Engine Running or Hybrid System 'READY' (The fault occurs when the vehicle is on and the EPS system is expected to be active.)
• Time After Ignition ON: 1-5 minutes (The system works for a few minutes after starting, then fails and sets the code once the faulty converter heats up or fails a self-check.)

Related Codes

• C1532 — Indicates 'ECU Malfunction'. If the ECU fails to send the 12V 'turn-on' signal to the converter, C1532 stores. The 'Forced Activation Test' differentiates the two: if forcing the converter on works, the fault is the ECU (C1532); if not, it's the converter (C1568).
• C1241 — Indicates 'Low or Abnormal Battery Voltage'. Address this FIRST. A failing battery or alternator starves the EPS system of power, causing a secondary C1568 code.
• C1515 / C1525 — These codes ('Torque Sensor Zero Point Adjustment Undone') are consequences, not causes. They appear after power is lost to the EPS system or after the ECU is replaced. Clear them by performing a steering sensor calibration.
• U0131 — Indicates 'Lost Communication With Power Steering Control Module'. It means other modules cannot communicate with the Power Steering ECU because the ECU lost power or a network wiring issue exists.

Climate & Environmental Factors

• Humidity and Water: The converter's placement under the battery tray makes it highly vulnerable to water intrusion from rain or car washes overflowing the windshield cowl. High-humidity climates accelerate corrosion of the housing and electrical pins.
• Road Salt: Salt spray coats engine bay components. This salt-laden moisture is highly corrosive and dramatically accelerates the degradation of electrical connectors and ground points for the EPS system.
• Extreme Cold: Extreme cold makes old plastic connectors and wire insulation brittle and prone to cracking or failure if disturbed during diagnosis.

How to Talk to a Mechanic About This Code

Say this: "I have a P/S light on and my scanner shows code C1568. I understand this is often a failed power steering converter, but I want to avoid misdiagnosing it for the more expensive ECU. Please confirm you can test the converter and ECU outputs separately."

This directs the mechanic to perform a specific, conclusive diagnosis (like the 'Forced Activation Test') rather than just replacing the most expensive part.

Avoid saying:

• 'My power steering is out, can you fix it?'
• 'I think I need a new power steering computer.'
• 'Just replace whatever is needed.'

Questions to ask before authorizing the repair:

• What was the specific failure you found? Was the converter not producing voltage, or was the ECU not sending the 'turn-on' signal?
• If you are recommending an ECU replacement, can you show me the test results that prove the converter is good?
• Will the replacement part be a new OEM, used OEM, or an aftermarket part?
• If the ECU is replaced, does the estimate include the mandatory 'Zero Point Calibration' required afterward?

Where to Take It: Dealer vs Independent vs Chain

• Dealer:
  Best for: Vehicles still under warranty or extended service contracts., Complex hybrid models where high-voltage system diagnosis is required., When you want guaranteed OEM parts and a manufacturer-backed warranty.
  Downsides: Highest labor rates, typically 1.5-2x more than independent shops., May replace both the ECU and converter as an assembly rather than isolating the single failed component. (Typical cost: +50% vs. baseline)
• Independent Shop: Excellent fit, especially a trusted independent shop specializing in Japanese imports. They perform the correct, cost-effective diagnosis.
  Best for: Out-of-warranty Lexus or Toyota vehicles., Shops that specialize in Toyota/Lexus, as they are familiar with this specific C1568 issue., Cost-conscious owners comfortable with tested, used OEM parts.
  Downsides: Quality and expertise vary greatly. Vet the shop by checking for ASE certifications., May not have immediate access to the latest technical service bulletins. (Typical cost: +0% vs. baseline)
• Chain Shop: AVOID. This repair requires diagnostic depth and specific knowledge of Toyota/Lexus systems beyond the scope of a general chain repair shop.
  Best for: Simple, unrelated maintenance like oil changes, tires, and brakes.
  Downsides: Technicians lack specialized knowledge for complex electronic faults like C1568., High pressure to upsell leads to misdiagnosis and unnecessary replacement of expensive parts., Unlikely to have the specific scan tools needed for post-repair calibrations. (Typical cost: -10% vs. baseline)

When to Walk Away From the Repair

If the estimated repair cost exceeds 40-50% of the car's private-party value, consider your options. For a safety-critical issue like this, the repair is non-negotiable if you plan to keep driving it.

• Car worth $6000, fix is $2200: Borderline. The repair is about 37% of the car's value. Get a second opinion, and strongly consider using a warrantied used converter to bring the cost down.
• Car worth $10000, fix is $900: Fix it. This repair is well below the threshold and restores a critical safety function.
• Car worth $3500, fix is $1800: Walk away. The repair cost is over 50% of the vehicle's value. It is not economical to proceed.

What Scan Tool You Need for This Code

Minimum: A scanner that reads and clears codes from ALL vehicle modules, including the Power Steering (EPS) module. A basic engine-only code reader will NOT see the C1568 code.

A standard $20-$50 OBD-II reader only accesses the Engine Control Unit. The C1568 code is stored in the EPS module. Furthermore, if the Power Steering ECU is replaced, a 'Zero Point Calibration' is required, which basic scanners cannot perform.

Budget: BlueDriver Pro (~$100) — Reads and clears codes from the EPS module on Toyota/Lexus vehicles. It displays live data but lacks the bidirectional control needed to perform the Zero Point Calibration.

Mid-range: Foxwell NT510 Elite (with Toyota/Lexus software) (~$180) — Offers full-system diagnostics to read/clear the C1568 code, views live sensor data, and has the bidirectional control needed to perform the 'Zero Point Calibration' after an ECU replacement.

Professional: Autel MaxiCOM MK808 / MK906BT (~$500-1200) — Provides full professional-level capabilities. It reads all modules, graphs live data, and performs necessary calibrations for the EPS system.

Rent vs buy: Buy. Auto parts stores lend out basic code readers that only check for engine codes. These tools cannot access the EPS module where the C1568 code is stored.

How to Clear the Code After You Fix It

1. Reconnect the 12V battery if it was disconnected for the repair.
2. Use a professional-grade OBD-II scan tool to clear the C1568 code from the Power Steering (EPS) module.
3. If the Power Steering ECU was replaced, perform the 'Zero Point Calibration' for the steering angle and torque sensors.
4. Perform a short test drive involving left and right turns to confirm power assist is fully restored.

Drive cycle (~15 minutes): A long drive cycle is not required. After clearing the code, a 10-15 minute test drive including low-speed turns and a short period at 30+ mph confirms the fix.

Readiness monitors affected: Not Applicable

Watch out for:

• Disconnecting the battery does not clear the code from the EPS module's memory; a scan tool is required.
• If the code immediately returns, the root cause was not fixed. This happens when a good ECU is replaced instead of the faulty converter.
• Forgetting to perform the Zero Point Calibration after replacing the ECU prevents the system from working.

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).

• General: C1568 does not relate to emissions and will not cause an OBD-II emissions scan failure. However, the illuminated 'P/S' warning light results in an automatic failure of the safety inspection in most states.
• California: The emissions check passes with a C1568 code, but a separate safety inspection fails due to the warning light.
• New York: The annual safety inspection checks dashboard warning lights. An illuminated power steering warning light causes a failure.
• Texas: The power steering system is checked during the annual safety inspection. An illuminated warning light results in failure.

Most Commonly Affected Vehicles

• Lexus LS460 / LS460 L (2007-2017) — Extremely common failure. The converter is located under the battery and is highly prone to water damage. 2007-2012 models are particularly susceptible.
• Lexus RX400h (2006-2008) — Diagnosis on this hybrid model requires high-voltage checks (288V input) and a specific 42V output test.
• Lexus LS600h (2008-2016) — Shares the complex EPS architecture of the LS460 and RX400h, making it prone to the same converter and ECU malfunctions.
• Toyota Highlander Hybrid (2006-2007) — The 2006 model year was subject to an NHTSA investigation (PE06-055) for EPS malfunctions where C1568 was a primary trouble code.
• Lexus GS460 / GS450h (2007-2011) — Utilizes similar EPS systems to LS and RX counterparts and experiences C1568 due to converter failure.
• Toyota Crown / Crown Majesta (2004-2013) — Primarily in the S180 and S200 generations, these imported vehicles share platforms with Lexus models and suffer from identical EPS converter issues.
• Lexus IS250 / IS350 (2006-2013) — Check for specific Technical Service Bulletins regarding EPS wiring harness updates for the 2006-2008 models.
• Lexus GS350 (2007-2011) — RWD models log the C1568 code due to a fault in the power supply circuit for the EPS motor, though less common than in V8 or hybrid versions.

Manufacturer-Specific Notes

• Toyota/Lexus: This code is a hallmark of Toyota/Lexus EPS systems from the mid-2000s to late-2010s. Diagnostic flowcharts involve checks for unique voltages like 42V. On hybrid models, diagnosis requires high-voltage safety equipment.
• Jeep/Chrysler/Dodge: Code definitions are not universal. On Stellantis vehicles, C1568 indicates an unrelated fault, such as 'O2 Sensor 1/2 Heater Performance'.
• General: The term 'Converter' is misleading. While it functions as a DC-DC converter, service literature may officially name it 'Power Steering Module' or 'Inverter'.
• Toyota/Lexus Hybrids: The main EPS fuse on hybrid models is integrated into a larger 'Main Relay' or 'Fusible Link Block'. If this internal fuse blows, the entire assembly must be replaced.

Real Owner Stories

2008 Lexus LS460 with intermittent failure

Owner experienced intermittent loss of power steering. It failed upon starting but worked mid-drive. No codes were found with a basic scanner.

What they tried:

1. Puzzled by the lack of codes on a basic scanner.
2. Used an advanced scanner to retrieve C1568 and inspected connections.

Outcome: A loose 4-pin connector on the steering rack was the culprit. Securing it with a zip-tie provided a reliable connection and a free fix.

Lesson: Intermittent failure that changes with bumps strongly points to a wiring or connection issue. Inspect connectors for corrosion and security before buying expensive parts.

2006 Lexus RX400h with C1568 and C1241

After sitting for a week, the car lost power steering with 'Check Hybrid System' warnings. Codes C1568 and C1241 were present.

What they tried:

1. Performed the 'Forced Activation Test' by applying 12V to the converter's command wire.
2. Confirmed the converter produced 42V, proving it was good.

Outcome: The successful 42V test proved the converter was functional, pointing to a failed Power Steering ECU that was not sending the 'turn-on' signal. Replacing the ECU resolved the problem.

Lesson: Do not automatically replace the converter for C1568. Perform the 'Forced Activation Test' to isolate the fault between the ECU and the converter.

2007 Toyota Highlander Hybrid with C1568

The P/S light came on, and a scan revealed only code C1568. Power steering was completely inoperative.

What they tried:

1. Scan data showed a key voltage was at 1.4V instead of 10-14V.
2. Discovered a high-amperage fuse inside the main relay/fusible link block had blown.

Outcome: Instead of replacing the entire expensive relay block, the owner opened the unit and replaced just the internal 50A fuse to restore power.

Lesson: On hybrid models, a blown EPS fuse may be integrated into a larger fusible link block. Check for power into and out of this block before condemning the converter.

How to Prevent This Code From Triggering

• Clean Windshield Cowl and Fender Drains (Once per year, or twice in leafy/dusty areas) — Water overflowing clogged cowl drains drips directly onto the converter. Keeping these drains clear is the single most effective preventive measure.
• Inspect and Seal the Converter Connector (Once, during any under-hood service) — Apply dielectric grease to the connector housing to create a waterproof seal, preventing moisture from wicking into the pins.
• Install a DIY Water Shield (Once) — Fashion a simple shield from durable plastic and position it above the exposed converter to physically deflect water.
• Check and Clean Main Ground Points (Every 30,000 miles) — Clean the contact surfaces of the main ground straps with a wire brush to prevent high resistance and intermittent electrical faults.

Frequently Asked Questions

What is the '42V test' for C1568 and can I do it myself?

The '42V test' confirms if the converter or the ECU is at fault by manually sending a 12V signal to the converter to check its output. Due to the risk of component damage and high hybrid voltages (288V+), leave this test to professionals. It definitively isolates the failed component.

I replaced the Power Steering ECU, but C1568 came back. What did I do wrong?

C1568 most often points to the converter, not the ECU. The proper procedure is to verify the ECU sends the 'turn-on' signal first. If that signal is present, the ECU works, and the cheaper converter is the faulty part.

Can I use a used Power Steering Converter?

Yes, a used OEM part is often the best solution. New OEM converters are expensive or discontinued, and aftermarket options are rare. A tested, used OEM unit from a reputable dismantler is a reliable, plug-and-play repair.

Do I need to do any programming after replacing a part for C1568?

Replacing the Power Steering Converter requires zero programming. However, replacing the Power Steering ECU mandates a 'Zero Point Calibration' for the torque and rotation angle sensors. You must use a compatible scan tool to clear codes like C1515 and restore function.

Why did my power steering start working again after I hit a bump?

This strongly suggests a loose connection, a corroded ground wire, or an internal wire break. The physical shock temporarily re-establishes electrical contact, but the fault will return. Meticulously inspect all wiring and connectors before replacing expensive components.

Is there a recall for code C1568 on my Lexus or Toyota?

There is no widespread recall for code C1568, but NHTSA opened investigation PE06-055 for the 2006 Toyota Highlander Hybrid regarding this issue. Dealers handle this as a standard repair, though some offer goodwill assistance on low-mileage vehicles.

What does a burnt smell from under the hood have to do with C1568?

A burnt electronics smell is a major diagnostic clue. A smell under the hood near the battery means the Power Steering Converter shorted out internally. A smell inside the cabin near the driver's footwell indicates the Power Steering ECU failed.

Key Takeaways

• Code C1568 indicates a critical failure in the Electric Power Steering (EPS) DC-DC converter, resulting in an immediate, heavy steering wheel.
• Water intrusion into the converter module—typically located under the battery tray—causes over 80% of these failures in Toyota and Lexus vehicles.
• Never replace the $1,500 Power Steering ECU without first performing a 12V 'Forced Activation Test' to prove the much cheaper converter is actually at fault.
• Driving with this code requires 2 to 3 times the normal physical steering effort, making the vehicle unsafe for emergency maneuvers and requiring an immediate tow.
• A used OEM converter costing $75 to $250 is the most reliable and cost-effective repair, requiring zero programming after installation.