What does code P21C0 mean?

Q: What does code P21C0 mean?

Cold Start Cylinder 11 Injection Timing. P21C0 indicates that the engine control module (ECM) has detected an injection timing fault specifically for cylinder 11 during a cold start event. The ECM compares the expected injection timing window against the actual camshaft and crankshaft signals and sets this code when the deviation exceeds a calibrated threshold while the engine is cold.

DTC codes / P21xx · Fuel and air metering / P21C0

P21C0Cold Start Cylinder 11 Injection Timing

P21C0 indicates that the engine control module (ECM) has detected an injection timing fault specifically for cylinder 11 during a cold start event. The ECM compares the expected injection timing window against the actual camshaft and crankshaft signals and sets this code when the deviation exceeds a calibrated threshold while the engine is cold.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyProfessional

AreaFuel and air metering

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