SAE P1xxx DTCs: Engine

DTC	Error Message	Diagnostic Procedure	Malfunction Criteria and Threshold Value	Secondary Parameters with Enable Conditions	Monitoring Time Length	Frequency of checks, MIL Illum
P12A1	Fuel Rail Pressure Sensor High Pressure System	Check Fuel Pressure Sensor G247. Refer to → Fuel Pressure Sensor, Checking .	Pressure control activity >0.18MPa Fuel trim activity 0.85	Lambda control, Closed loop EVAP purge flow, 1 kg/h Engine speed, 500900 RPM Engine load, 1027% Fuel cut off, Not active	5 Seconds	Continuous 2 DCY
P12A2	Fuel Rail Pressure Sensor High Pressure System	Check Fuel Pressure Sensor G247. Refer to → Fuel Pressure Sensor, Checking .	Pressure control activity -0.2 MPa Fuel trim activity >1.3	Lambda control, Closed loop EVAP purge flow, 1 kg/h Engine speed, 600900 RPM Engine load, 1027% Fuel cut off, Not active	5 Seconds	Continuous 2 DCY
P12A4	Fuel Rail Pressure Control valve	Check Fuel Pressure Sensor G247. Refer to → Fuel Pressure Sensor, Checking .	Pressure control activity -8.0 MPa Fuel trim activity 0.951.3	Lambda control, Closed loop EVAP purge flow, 1 kg/h Engine speed, 600900 RPM Engine load, 1027%	5 Seconds	Continuous 2 DCY
P129B	Fuel Pressure Regulator 2 Control Circuit	Check Fuel Pressure Sensor G247. Refer to → Fuel Pressure Sensor, Checking .	Signal voltage 2.31 - 2.7 V	EVAP purge valve Commanded off Engine relay, Commanded on	1 Second	Continuous 2 DCY
P129C	Fuel Pressure Regulator 2 Control Circuit Low	Check Fuel Pressure Sensor G247. Refer to → Fuel Pressure Sensor, Checking .	Signal voltage 1.8- 2.25 V	EVAP purge valve Commanded off Engine relay, Commanded on	1 Second	Continuous 2 DCY
P129D	Fuel Pressure Regulator 2 Control Circuit High	Check Fuel Pressure Sensor G247. Refer to → Fuel Pressure Sensor, Checking .	Signal voltage >3.91 V	EVAP purge valve Commanded on Engine relay, Commanded on	1 Second	Continuous 2 DCY