What does code P1252 mean?

Q: What does code P1252 mean?

Start Of Injection Solenoid Circuit Open/Short To Ground. P1252 on Volkswagen vehicles indicates that the engine control module (ECM) has detected an open circuit or a short to ground in the start of injection solenoid circuit. This solenoid is used on certain diesel engines to control the injection timing, and the ECM monitors the circuit for expected voltage and current; when the signal falls outside the expected range, the code is stored and the ECM may default to a limp mode.

DTC codes / Volkswagen codes / P1252

P1252 · VolkswagenStart Of Injection Solenoid Circuit Open/Short To Ground

P1252 on Volkswagen vehicles indicates that the engine control module (ECM) has detected an open circuit or a short to ground in the start of injection solenoid circuit. This solenoid is used on certain diesel engines to control the injection timing, and the ECM monitors the circuit for expected voltage and current; when the signal falls outside the expected range, the code is stored and the ECM may default to a limp mode.

SystemPowertrain

Code typeVolkswagen specific

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering (injector circuits)

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