Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Normal Operation and Fault Conditions
The ABS module uses an internal solid state switch to operate the hydraulic pump motor. The ABS module tests the hydraulic pump motor by activating it for 30 milliseconds. The ABS module monitors the voltage drop across the hydraulic pump motor while the pump motor is being activated. After 30 milliseconds have passed, the ABS module stops applying voltage to the pump motor and monitors the voltage the spinning hydraulic pump motor is generating and the voltage drop across the hydraulic pump motor solid state switch. If the monitored voltages are not within the specifications, the ABS module sets one or more DTCs.
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| C0020:16 | ABS Pump Motor Control: Circuit Voltage Below Threshold | Sets when the ABS module detects an under voltage condition at the pump motor voltage input. |
| C0020:17 | ABS Pump Motor Control: Circuit Voltage Above Threshold | Sets when the ABS module detects more than 0.93 volt for longer than 3 seconds from the pump motor once the pump motor has been deactivated. |
| C0020:49 | ABS Pump Motor Control: Internal Electronic Failure | Sets if the hydraulic pump motor actual state does not match the commanded state for 30 seconds; pump is running, pump is not running or pump motor relay shorted. |
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.