What it means
The EBCM detects a fault in the ABS pump-motor circuit (open/short/failed activation). Many OEM procedures state the pump motor is integral to the brake modulator and not serviceable separately; diagnosis focuses on power/ground and relay control before condemning the unit. HSV GTS+1
Symptoms
- ABS light on; ABS function inhibited; base brakes typically normal. TrailVoy
Common causes
- Open/short in pump-motor feed or ground; failed relay/driver.
- Internal pump-motor failure (seized or out-of-spec current draw). TrailVoy
Diagnostic notes
- Verify power/ground at the modulator; command pump with scan tool/bi-directional test.
- If power/ground and command are good but motor won’t run, the modulator/pump assembly is usually replaced. HSV GTS
Possible fixes
- Repair feed/ground/relay circuits; if internal fault is confirmed, replace the modulator assembly (per OEM).
- Some platforms have updated EBCM software/hardware for pump-motor faults. RepairPal.com