C0252
Pump Motor Ground Circuit Open
The pump motor ground return is open. The motor cannot run, and the system disables ABS and stability control.
- Check engine light: Not always
- Emissions related: No
- Repair difficulty: medium
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
Common causes
Ordered by how often each turns out to be the cause.
- Ground strap corrodedCommon
- Ground wire brokenPossible
- Pin pushed back out of connector bodyLess likely
Parts involved
- ABS Pump Motor
- Ground Strap
C0252 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.