What does code P2890 mean?

Q: What does code P2890 mean?

Cylinder 1 Ion Current Sense Circuit. P2890 indicates that the powertrain control module (PCM) has detected an abnormal signal on the ion current sense circuit for cylinder 1. The ion current sense system uses a small voltage across the spark plug electrodes after combustion to measure ionization, which helps the PCM detect misfires and optimize ignition timing; this code means the circuit's electrical value is outside the expected range.

DTC codes / P28xx · Transmission / P2890

P2890Cylinder 1 Ion Current Sense Circuit

P2890 indicates that the powertrain control module (PCM) has detected an abnormal signal on the ion current sense circuit for cylinder 1. The ion current sense system uses a small voltage across the spark plug electrodes after combustion to measure ionization, which helps the PCM detect misfires and optimize ignition timing; this code means the circuit's electrical value is outside the expected range.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaTransmission

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