What does code P03B4 mean?

Q: What does code P03B4 mean?

Cylinder 4 Pressure Sensor Circuit Range/Performance. P03B4 indicates that the powertrain control module has detected an out-of-range or erratic signal from the cylinder 4 pressure sensor circuit, which is used on engines with in-cylinder pressure sensing for precise combustion monitoring. The computer compares the sensor voltage against expected values for the current operating conditions and flags the circuit when the signal falls outside the allowable range or fails a performance rationality check.

DTC codes / P03xx · Ignition system and misfire / P03B4

P03B4Cylinder 4 Pressure Sensor Circuit Range/Performance

P03B4 indicates that the powertrain control module has detected an out-of-range or erratic signal from the cylinder 4 pressure sensor circuit, which is used on engines with in-cylinder pressure sensing for precise combustion monitoring. The computer compares the sensor voltage against expected values for the current operating conditions and flags the circuit when the signal falls outside the allowable range or fails a performance rationality check.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaIgnition system and misfire

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