What does code P03A4 mean?

Q: What does code P03A4 mean?

Cylinder 2 Pressure Too Low. P03A4 indicates that the powertrain control module has detected abnormally low pressure in cylinder 2 during the power stroke, typically by comparing crankshaft speed fluctuations or using a dedicated in-cylinder pressure sensor. The engine computer sets this code when the measured or inferred pressure falls below the expected threshold for that cylinder under the current operating conditions.

DTC codes / P03xx · Ignition system and misfire / P03A4

P03A4Cylinder 2 Pressure Too Low

P03A4 indicates that the powertrain control module has detected abnormally low pressure in cylinder 2 during the power stroke, typically by comparing crankshaft speed fluctuations or using a dedicated in-cylinder pressure sensor. The engine computer sets this code when the measured or inferred pressure falls below the expected threshold for that cylinder under the current operating conditions.

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.