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DTC P150C

DTC P150C

Diagnostic Instructions


• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• Diagnostic Procedure Instructions provides an overview of each diagnostic category.


DTC Descriptors

DTC P150C

Transmission Control Module Engine Speed Request Circuit Signal Message Counter Incorrect

Circuit/System Description

To improve vehicle shift feel, the transmission control module (TCM) is constantly sending the engine control module (ECM) serial data messages with information regarding its request for modifying engine speed or torque. The ECM sets this code when it detects a discrepancy in the structure of this message causing its integrity to be questioned.

An intermittent fault in the controller area network (CAN) circuits will cause DTC P150C to set.

Conditions for Running the DTC

Engine is running.

Conditions for Setting the DTC

The ECM detects greater than 2 message count errors.

Action Taken When the DTC Sets


• The ECM disables engine speed and torque requests from TCM.

• DTC P150C is a type B DTC.


Conditions for Clearing the DTC

DTC P150C is a type B DTC.

Reference Information

Description and Operation

Data Link Communications Description and Operation

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification


• DTC P150C is an information dtc. Troubleshoot all other ECM fault codes before DTC P150C. See Fault code (DTC) List - Car .

• If there are no other ECM fault codes, diagnosis takes place by looking for a returning CAN-circuit fault. Go to Diagnostic tool does not communicate with high-speed GMLAN-device .


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for control solenoid valve assembly replacement, setup, and programming.