Engine Controls - MIL ON/ Possible DTC P0123/P01596
NUMBER: 08-031-03GROUP: Electrical
DATE: Oct. 31, 2003
SUBJECT:
PCM Connector Corroded - Sets MIL Light
OVERVIEW:
This bulletin involves replacing the Power Train Control Module (PCM) and the related wire harness.
MODELS:
2003 (DR) Ram Truck
NOTE:
This bulletin applies to vehicles equipped with a 5.9L diesel engine and an automatic transmission.
SYMPTOM/CONDITION:
Water may enter the PCM connector causing corrosion of electrical terminals on the PCM. This condition can set diagnostic trouble codes and illuminate the MIL light. The most common codes encountered are: P0123 - TPS voltage high or P01596 - MUX Speed Control Voltage High.
DIAGNOSIS:
If either of these diagnostic trouble codes are present or other diagnostics lead to PCM connector problems, Inspect the PCM and the PCM wire harness connector. Look for darkened or discolored connector pins or any signs of tracking on the insulator. If any signs of corrosion are present, perform the Repair Procedure. If no signs of corrosion are present other diagnostic methods will be required.
PARTS REQUIRED:
REPAIR PROCEDURE:
1. Disconnect the negative battery cable.
2. Remove the PCM.
3. Install the appropriate PCM from the Parts Required section above.
4. Remove the transmission wire harness from the vehicle and Install the appropriate new harness listed above.
5. Make sure to fully seat the harness connector into the PCM. Push the harness connectors slowly into the PCM. Two clicks will be heard when the connector is seated. This assures that both latches are secure.
6. Connect the negative battery cable.
POLICY:
Reimbursable within the provisions of the warranty.
TIME ALLOWANCE:
FAILURE CODE: