What does code P229B mean?

DTC codes / P22xx · Fuel and air metering (injector circuits) / P229B

P229BFuel Pressure Regulator B Exceeded Control Limits - Pressure Too High

P229B indicates that the powertrain control module has detected the fuel pressure regulator for circuit B is unable to maintain the commanded pressure, with actual pressure rising above the control limit. The computer compares the desired fuel pressure to the measured pressure from the fuel rail pressure sensor and sets this code when the regulator cannot reduce pressure enough to stay within its calibrated range.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering (injector circuits)

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