OBD-II reference

All 9.533 generic OBD-II codes, explained in detail.

Causes, inspection steps and sources — a comprehensive DIY archive. Created and maintained with love for the detail. Good luck and have fun!

Powertrain generic / SAE

P0525

Cruise Control Servo Control Circuit Range or Performance

The control circuit to the cruise control servo (vacuum or electric actuator that holds throttle position) shows feedback in plausible range yet inconsistent with the commanded action - servo slow, sticking, or supply weak.

SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number5 / 25

Possible causes

  • Servo response slow due to wear high
  • Vacuum supply low (vacuum servo) medium

Inspection / repair

  • Difficulty: medium
  • DIY: possible
  • Estimated cost: 120–500 €
  • Estimated time: 0.8–2.5 h
  • Component: cruise control servo
  • MIL / check engine light

Sources

References

How to read OBD-II codes

The first letter names the vehicle system, the second digit distinguishes generic from manufacturer-specific, the remaining digits group fault area and number.

PPowertrain: engine, transmission, emissions
BBody: chassis trim, comfort, interior
CChassis: suspension, brakes, steering
UNetwork: CAN, control modules, communication