OBD-II code · Powertrain (generic)
P0635 Power Steering Control Circuit
A general circuit fault is detected on the power steering control output - typically the line that the ECU uses to request raised idle when steering load is high, or to enable an electric pump.
Is it safe to drive with P0635?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyOpen in control line
Symptoms
- Check engine light on
- Possible limp mode or no-start
- Multiple follow-up faults across modules
- Reset/relearn may be needed after repair
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–1.8 h
- Emissions test
- Usually unaffected
- Parts involved
- Power Steering Control Signal
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.