What it means
The control module monitors supply voltage circuit A for the ABS pump motor. It sets this code when the voltage is higher than the expected range.
At a glance
- Usually lights the ABS or stability-control warning light
- The engine or gearbox may go into limp mode
How it works
The ABS control system monitors supply voltage circuit A for the ABS pump motor, which helps build hydraulic pressure during ABS operation. This code sets when circuit A voltage rises above the expected range, potentially affecting ABS and stability functions.
Common causes
Most likely first.
- Charging system overvoltage
- Voltage regulator fault
- Wiring short to voltage
- Control module fault
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
How to diagnose it
- Record ABS freeze-frame data and check live system voltage to see whether the high reading occurred with a charging-system event.
- Measure battery and charging-system voltage under the conditions specified by the manufacturer to check for overvoltage.
- Inspect the ABS pump motor supply circuit A fuse, connectors, and wiring for damage or a short to a voltage source.
- Check circuit A voltage at the ABS hydraulic unit using the manufacturer’s procedure to determine whether the high reading is present at the unit.
- If charging voltage and circuit wiring are correct, follow the manufacturer’s tests to assess the ABS control module.
Common fixes
- Correct a charging-system or voltage-regulator fault causing overvoltage.
- Repair wiring in ABS pump motor supply circuit A that is shorted to voltage.
- Clean or repair a damaged connector or fuse contact in circuit A.
- Replace the ABS control module only if testing confirms an internal fault.
Can I keep driving?
Normal braking may remain, but ABS and stability control can be unavailable. Drive cautiously, leave extra stopping distance, and have the overvoltage checked promptly to reduce the risk of further electrical damage.
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.