OBD-II Generic Error Code P0637: How to Fix It

Medium 1-2 hours Medium Severity Verified June 2026
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Error Code
P0637
Brand
OBD-II Generic
Product Type
automotive
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
1-2 hours
Error code P0637 means the Powertrain Control Module (PCM) detected a high voltage condition in the steering control circuit. This usually indicates a wiring fault, a failing steering angle sensor, or a problem with the Power Steering Control Module (PSCM). While you can drive cautiously, the vehicle may have reduced power steering assist or other drivability issues.
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Tools You'll Need

How to Fix Error Code P0637

  1. Safety First: Disconnect Battery

    Always disconnect the battery before working on electrical components. Failure may cause injury or damage.

  2. Inspect Steering Control Wiring and Connectors

  3. Check for Continuity and Short to Voltage

    Reconnect battery temporarily for voltage checks, but be careful of moving parts and airbag systems.

  4. Test the Steering Angle Sensor

  5. Replace the Power Steering Control Module (PSCM)

    Some vehicles require PSCM programming after replacement. You may need a professional scan tool or dealer visit.

Parts You May Need

Steering angle sensor
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Power Steering Control Module (PSCM)
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Steering angle sensor
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Power Steering Control Module (PSCM)
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Steering angle sensor
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Power Steering Control Module (PSCM)
Check Price on Amazon
Steering angle sensor
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Power Steering Control Module (PSCM)
Check Price on Amazon
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When to Call a Professional

If you've checked wiring and sensors and the code returns, or if the vehicle requires PSCM programming/calibration, visit a qualified mechanic or dealer.

Frequently Asked Questions

Can I drive with code P0637?
You can drive short distances, but power steering assist may be reduced or erratic. Get it diagnosed promptly to avoid safety issues.
What causes error P0637?
Common causes include a faulty steering angle sensor, damaged wiring, a failed power steering control module, or a short to voltage in the steering control circuit.
Will a bad steering angle sensor trigger P0637?
Yes, a malfunctioning steering angle sensor can send high voltage signals, setting code P0637.
How much does it cost to fix P0637?
DIY cost: $20-$50 for sensors or $100-$300 for a PSCM. Professional repair: $200-$800 depending on parts and labor.
Can I clear code P0637 with a scanner?
Yes, but if the underlying issue isn't fixed, the code will return immediately.

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