Chassis, generic

C062B Variable Effort Steering Module Temperature Too Low

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

C062B is set when the module or its coil driver reads a temperature below the range it is designed for. Automotive driver chips such as TI's DRV8873-Q1 are specified down to an ambient of −40 °C, so a lower reading means either an extreme cold soak or a measurement that has failed. Cold also changes the steering itself: the GM patent on temperature compensation for magnetic variable effort steering points to thicker fluid and changed electrical and magnetic behaviour, and corrects the coil current with tables tested at different temperatures, either from a fluid temperature sensor or from the current deviation. Outside its table the module cannot compensate and suspends variable effort. No maker publishes C062B. Unlike C062A, warming up usually clears it.

Likely causes

Vehicle parked for a long time in severe frost
Open or failed temperature measurement inside the module or at the fluid sensor
Moisture or corrosion at the connector distorting the reading

Symptoms

  • Variable effort inactive after a cold start
  • Heavy or uneven steering until the system warms up

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€0–1,200
Time0.3–3 h

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

Parts involved

ves module

Related codes

C062AC0628C061F

References: patents.google.com, ti.com.