P0637
Power Steering Control Circuit High
P0637 is an OBD-II diagnostic trouble code meaning: Power Steering Control Circuit High. Common causes: short circuit of the control circuit to the power source, damaged power steering wiring insulation. Estimated repair cost: $17–556.
Symptoms
- Heavy or unstable steering wheel
- Check Engine light comes on
- EPS/EPAS indicator on the instrument panel
- Power steering is in emergency mode
- The power steering may turn off spontaneously
Causes
- Short circuit of the control circuit to the power source
- Damaged power steering wiring insulation
- Electric Power Steering (EPS) module malfunction
- Lost contact in control circuit connectors
- ECU malfunction
How to Fix
- Read all error codes, record the order in which they appear
- Check control circuit wiring for short to positive
- Inspect and clean all EPS module connectors
- Check the integrity of the fuses and relays of the EPS system
- Test the EPS module using a dealer or third party scanner
- If a malfunction is confirmed, replace the EPS module or ECU
Related codes
Error P0637 by Vehicle Brand
FAQ
What does the P0637 code mean?
P0637 is an OBD-II diagnostic trouble code that indicates: Power Steering Control Circuit High
What causes a P0637 error code?
The most common causes of P0637 include: Short circuit of the control circuit to the power source; Damaged power steering wiring insulation; Electric Power Steering (EPS) module malfunction; Lost contact in control circuit connectors.
How do I fix a P0637 diagnostic trouble code?
To fix P0637: Read all error codes, record the order in which they appear. Check control circuit wiring for short to positive. Inspect and clean all EPS module connectors. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P0637?
Do not drive — repair immediately
How much does it cost to fix P0637?
The estimated repair cost for P0637 is $17–556. Actual cost depends on your vehicle, location, and labor rates.
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