P0525
Cruise Control Servo Control Circuit Range/Performance
Cruise control
Generic OBD-II
Medium
What it means
P0525 means the control circuit for the cruise control servo (the actuator that adjusts the throttle to hold your set speed) is reading outside its expected range. The result is cruise control that won't engage or won't maintain speed, usually from a faulty servo or a wiring problem in its circuit. Normal driving is unaffected, so this is a convenience-feature and check-engine-light issue rather than a safety one.
Medium
Can I keep driving? Safe to keep driving — only cruise control is affected, so the engine and normal driving are unchanged.
Common symptoms
What you'll notice
- Cruise control won't engage or won't hold a set speed
- Cruise control drops out unexpectedly
- Check-engine light on
- No change to normal (non-cruise) driving
Common causes
Most likely first
- Faulty cruise control servo/actuatorLikely
- Wiring or connector fault in the servo control circuitCommon
- Faulty cruise control module or switchCommon
- Engine control module (ECM) fault (rare)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and confirm the code with a scan tool.
- Verify cruise control is inoperative and check the on/off and set switches.
- Inspect the servo's connector and wiring for opens, shorts, or corrosion.
- Test the servo's control signal and resistance against spec.
- Replace the servo if it fails; treat the module/ECM as a last resort. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P0525?+
Yes. This only disables cruise control — the engine, brakes, and normal acceleration are unaffected. Fix it when convenient to get cruise working and clear the light.
Can I just clear P0525?+
It returns once the ECM re-checks the servo circuit unless the servo or its wiring is repaired.
Related codes
Often seen with P0525
Read & clear P0525 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX