What does code P28BA mean?

Q: What does code P28BA mean?

Cylinder 11 Ion Current Sense Circuit Low. P28BA indicates that the engine control module (ECM) has detected an abnormally low voltage on the ion current sense circuit for cylinder 11, which is used to monitor combustion quality and detect misfires. The ECM compares the signal from the ion current sensor to expected values and sets this code when the circuit voltage falls below the calibrated threshold, indicating a short to ground, open circuit, or faulty sensor.

DTC codes / P28xx · Transmission / P28BA

P28BACylinder 11 Ion Current Sense Circuit Low

P28BA indicates that the engine control module (ECM) has detected an abnormally low voltage on the ion current sense circuit for cylinder 11, which is used to monitor combustion quality and detect misfires. The ECM compares the signal from the ion current sensor to expected values and sets this code when the circuit voltage falls below the calibrated threshold, indicating a short to ground, open circuit, or faulty sensor.

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.