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Pinpoint Test I : Lost Communication With The Pcm (Powertrain Control Module): Notes

Lost Communication With The PCM 

Refer to Wiring Diagram(s) VEHICLE DYNAMIC SYSTEMS for schematic and connector information.

NOTE: The TCM and the differential control module - rear are both internal components of the PCM.

Normal Operation and Fault Conditions 

With the ignition ON, the PCM sends messages to the ABS module over the HS-CAN. If the ABS module does not receive these messages within the specified time frame, the ABS module sets Diagnostic Trouble Codes (DTCs). This can be due to a PCM failure, a circuit failure on the HS-CAN or an excessive load on the network. For information on the messages sent to the ABS module by the PCM, TCM and differential control module - rear, REFER to: Anti-Lock Brake System (ABS) and Stability Control - System Operation and Component Description 

DTC Fault Trigger Conditions 

DTC Description Fault Trigger Conditions
C0040:87 Brake Pedal Switch "A": Missing Message This DTC sets in continuous memory and on-demand if the brake pedal position message is missing for more than 500 ms. This can be due to a PCM failure, a stoplamp switch failure, a circuit failure on the HS-CAN or an excessive load on the network.
U0100:00 Lost Communication With ECM/PCM "A": No Sub Type Information This DTC sets in continuous memory and on-demand if any one of the following messages is missing; brake pedal position, cruise control status, power pack status or reverse gear. This can be due to a PCM failure, a circuit failure on the HS-CAN or an excessive load on the network.
U0101:00 Lost Communication With TCM: No Sub Type Information This DTC sets in continuous memory and on-demand if the selector lever (PRNDL) status message is missing.
U0136:00 Lost Communication With Differential Control Module - Rear: No Sub Type Information This DTC sets in continuous memory and on-demand if the all-wheel drive lock status message is missing.
U0437:68 Invalid Data Received From Differential Control Module - Rear: Event Information This DTC sets in continuous memory and on-demand if the all-wheel drive lock status message contains incorrect information.

Possible Causes 

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