P1CEF

P1CEF-COLD CLIMATE TURBO PROTECTION ENGINE DE-RATE MODE

For a complete wiring diagram, refer to the Wiring Information.

Theory of Operation

Oil to the bearings in the turbocharger is supplied through a hose connected to the filter head. In cold temperatures, oil becomes more viscous and hence travels slowly through the oil passages. If the turbo spins at higher speeds before the oil reaches the turbo, the bearings in the turbo fail. So, at cold ambient temperatures, the torque and power available to the engine are being limited to limit the turbo speeds until the oil reaches the turbo. Depending on the Ambient / coolant temperature, the torque de-rate is applied from 2 seconds to 200 seconds. This DTC will not turn on the MIL lamp.

- When Monitored:
Key on, engine running.

- Set Condition:
Coolant and ambient temperature less than 10°F (-12°C).





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Pre-Diagnostic Troubleshooting Procedure.

1. OTHER DTCs PRESENT
1. Ignition on, engine not running.
2. With the scan tool, read DTCs.
3. Check for any faults present for Coolant Temperature Sensor, Temperature/Barometric Pressure Sensor (TBAP) and, or Oil Pressure Switch?

Are any faults present for the above sensors?

Yes

- Repair any faults present for the above listed sensors.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test.

No

- Go To 2

2. COLD CLIMATE DERATE VERIFICATION





NOTE: This is a normal turbo protection condition. The de-rate was activated to protect the turbocharger from failing due to oil delay to the bearings. Please inform the customer on this condition.

1. View the de-rate protection strategy in the table above.

Information only