Chassis, generic

C0629 Variable Effort Steering Control Module Incorrect Component Installed

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

C0629 flags a mismatch between what the variable effort steering module expects and what is fitted. Variable-effort gears exist in versions that cannot be swapped blindly: replacement racks come with or without the EVO solenoid, and GM's second Magnasteer generation dropped the permanent magnet and only raises effort with speed, whereas the first one reverses coil current around 45 mph. A Steering Solutions patent shows why this matters: the current's direction decides whether effort goes up or down. A module that detects the wrong part, wrong position or wrong variant blocks its function, much like Mitsubishi's brake unit flags a wheel sensor fitted in the wrong place within 3 s. No maker publishes C0629. It usually follows a gear or module swap.

Likely causes

Replacement steering gear of the wrong variant, for example without actuator
Module from another vehicle or not configured for this equipment
Actuator connected with reversed polarity after a repair

Symptoms

  • Variable assist inactive after a steering or module repair
  • Steering effort behaves the wrong way round, heavy when slow
  • Steering warning on some vehicles

Repair estimate

DifficultyHardWorkshop job
Parts and labour€50–1,500
Time0.5–4 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

ves moduleves actuator

Related codes

C0628C061CC0624

References: aa1car.com, patents.google.com, mitsubishitechinfo.com.