P0635
Power Steering Control Circuit
P0635 is an OBD-II diagnostic trouble code meaning: Power Steering Control Circuit. Common causes: open or shorted in the steering pump control circuit, faulty power steering pump relay. Estimated repair cost: $3–667.
Symptoms
- The Check Engine light comes on
- Heavy steering, especially at low speeds
- EPS or power steering light comes on
- Unstable gain: sometimes it works, sometimes it doesn’t
- Extraneous noise from the steering pump or motor
Causes
- Open or shorted in the steering pump control circuit
- Faulty power steering pump relay
- EHPS electric pump malfunction
- Failure in data exchange between the ECU and the EPS unit
- Damage to the connector or wiring of the steering system
How to Fix
- Read error codes from the EPS control unit (if separate)
- Check the power steering pump fuse and relay
- Check the control wire between the ECU and the relay/pump
- Measure the pump supply voltage with the engine running
- Check hydraulic fluid level (for EHPS)
- If the wiring is in good condition - diagnostics of the pump and EPS unit
Related codes
Error P0635 by Vehicle Brand
FAQ
What does the P0635 code mean?
P0635 is an OBD-II diagnostic trouble code that indicates: Power Steering Control Circuit
What causes a P0635 error code?
The most common causes of P0635 include: Open or shorted in the steering pump control circuit; Faulty power steering pump relay; EHPS electric pump malfunction; Failure in data exchange between the ECU and the EPS unit.
How do I fix a P0635 diagnostic trouble code?
To fix P0635: Read error codes from the EPS control unit (if separate). Check the power steering pump fuse and relay. Check the control wire between the ECU and the relay/pump. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P0635?
Do not drive — repair immediately
How much does it cost to fix P0635?
The estimated repair cost for P0635 is $3–667. Actual cost depends on your vehicle, location, and labor rates.
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