What does code P1237 mean?

Q: What does code P1237 mean?

Cylinder 1 Injector Circuit Open Circuit. P1237 on a Volkswagen indicates that the engine control module (ECM) has detected an open circuit in the electrical path for cylinder 1's fuel injector. The ECM commands the injector to fire but sees no current flow or an unexpected voltage drop, meaning the circuit is broken somewhere between the ECM and the injector, or inside the injector coil itself.

DTC codes / Volkswagen codes / P1237

P1237 · VolkswagenCylinder 1 Injector Circuit Open Circuit

P1237 on a Volkswagen indicates that the engine control module (ECM) has detected an open circuit in the electrical path for cylinder 1's fuel injector. The ECM commands the injector to fire but sees no current flow or an unexpected voltage drop, meaning the circuit is broken somewhere between the ECM and the injector, or inside the injector coil itself.

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.