What it means
The control module monitors supply voltage circuit A for the ABS pump motor for stable operation. It sets this code when the voltage response is outside the expected range or performance limits.
At a glance
- Usually lights the ABS or stability-control warning light
How it works
ABS pump motor supply voltage circuit A provides power monitored by the brake control system while the pump operates. This code sets when the voltage response is unstable or outside the expected performance range, even if it is not consistently too high or too low.
Common causes
Most likely first.
- ABS pump motor supply voltage instability
- Poor connection or damaged wiring
- ABS control module fault
Symptoms
- ABS warning light
- ABS or stability-control functions may be limited
How to diagnose it
- Save freeze-frame data and check for related ABS or charging-system codes that could explain an unstable circuit A supply.
- Monitor system and circuit A voltage while the ABS pump is commanded under the manufacturer’s test procedure, looking for drops or fluctuations.
- Inspect the circuit A fuse, ABS connector, and wiring for loose contacts, corrosion, heat damage, or intermittent connections.
- Check the charging system and battery connections for voltage instability that could affect pump supply.
- If the supply remains unstable at the ABS unit despite sound wiring and charging voltage, test the module using the manufacturer’s procedure.
Common fixes
- Secure or clean a loose circuit A fuse or connector contact.
- Repair damaged wiring or an intermittent connection in circuit A.
- Correct a battery or charging-system fault causing unstable voltage.
- Replace the ABS control module if testing confirms it cannot regulate or interpret the circuit correctly.
Can I keep driving?
ABS or stability functions may be limited, although base braking may continue. Drive cautiously and allow extra stopping distance until circuit A voltage is stable and the warning is resolved.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.