PACCAR PX-8 CM2150 (2007-09) Fault Code: 2554 PID: 131 SPN: 1209 FMI: 2 Exhaust Gas Pressure – Data Erratic, Intermittent, or Incorrect. The exhaust gas pressure sensor is reading an erratic value at initial Key On.

Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe™ Online for applicable fixes to the calibration stored in the ECM. If necessary, calibrate the ECM. Use the following procedure in the corresponding Troubleshooting and Repair Manual for the engine being serviced.

At KEY ON, before the engine starts, the sensor readings for intake manifold pressure, barometric air pressure, and exhaust gas pressure are compared to each other. This fault code occurs if the exhaust gas pressure sensor reading is different from the other sensor readings. This check is only done once after the keyswitch is turned ON.

Possible causes:

1)A stuck in-range exhaust gas pressure sensor reading
2)A high resistance in the exhaust gas pressure sensor signal or return lines
3)Plugging or restriction in the exhaust gas pressure sensor tube.

Possible repairs:

1)Replace the exhaust gas pressure sensor.
2)Repair or replace the engine harness.
3)Clean or replace the exhaust gas pressure sensor tube.
4)If necessary, calibrate the ECM.

PACCAR PX-8 CM2150 (2007-09) Fault Code: 2451 PID: SPN: 2789 FMI: 0 Turbocharger Turbine Inlet Temperature (Calculated) – Data Valid but Above Normal Operational Range – Moderately Severe Level. Turbocharger turbine inlet temperature has exceeded the engine protection limit.
PACCAR PX-8 CM2150 (2007-09) Fault Code: 2449 PID: SID 027 SPN: 641 FMI: 13 VGT Actuator Controller – Out of Calibration. The VGT has failed the automatic calibration procedure at initial key-ON.
PACCAR PX-8 CM2150 (2007-09) Fault Code: 2448 PID: SPN: 111 FMI: 1 Coolant Level – Data Valid but Below Normal Operational Range – Least Severe Level. Low engine coolant level detected.
PACCAR PX-8 CM2150 (2007-09) Fault Code: 2387 PID: SID 027 SPN: 641 FMI: 7 VGT Actuator Driver Circuit (Motor) – Mechanical System Not Responding Properly or Out of Adjustment. The smart VGT controller has detected incorrect stop limits, or the VGT is unable to move to the closed position.
PACCAR PX-8 CM2150 (2007-09) Fault Code: 2377 PID: SID 033 SPN: 647 FMI: 3 Fan Control Circuit – Voltage Above Normal or Shorted to High Source. Open circuit or high voltage detected at the fan control circuit.
PACCAR PX-8 CM2150 (2007-09) Fault Code: 2376 PID: 412 SPN: 412 FMI: 4 Exhaust Gas Recirculation Temperature Sensor Circuit – Voltage Below Normal or Shorted to Low Source. Low signal voltage detected at EGR temperature circuit.
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