C05A9

ABS Pump Motor Supply Voltage Circuit A/B Correlation

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

ABS light is on
The ABS system does not activate correctly
Loss of braking efficiency

Causes

Poor contact in the ABS pump connectors
Open or short circuit in wiring harness
ABS pump motor malfunction
Problems with the ABS control unit

How to Fix

Check the connectors and wiring harness of the ABS pump
Measure the voltage on circuits A and B
Replace the faulty component (pump, wiring, control unit)

Related codes

C05A8 C05AA C05AB