What does code P1435 mean?

Q: What does code P1435 mean?

Secondary Air Injection Pump Relay Circuit Short To Ground. P1435 on a Volkswagen means the engine control module (ECM) has detected a short to ground on the control circuit for the secondary air injection (SAI) pump relay. The ECM commands the relay on during cold starts to run the air pump, but the voltage on the relay control wire stays at or near zero volts when it should switch to battery voltage, indicating the wire is touching ground somewhere between the ECM and the relay.

DTC codes / Volkswagen codes / P1435

P1435 · VolkswagenSecondary Air Injection Pump Relay Circuit Short To Ground

P1435 on a Volkswagen means the engine control module (ECM) has detected a short to ground on the control circuit for the secondary air injection (SAI) pump relay. The ECM commands the relay on during cold starts to run the air pump, but the voltage on the relay control wire stays at or near zero volts when it should switch to battery voltage, indicating the wire is touching ground somewhere between the ECM and the relay.

SystemPowertrain

Code typeVolkswagen specific

SeverityMedium

Fix difficultyIntermediate

AreaAuxiliary emission controls

Guidance is general and written for Volkswagen vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.