Powertrain Management

DTC P150C

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructionsprovides an overview of each diagnostic category.

DTC Descriptor
DTC P150C
- Transmission Control Module Engine Speed Request Signal Message Counter Incorrect

Circuit/System Description

This diagnostic applies to communication integrity between the engine control module (ECM) and the transmission control module (TCM). The ECM determines that the engine speed signal counter is incorrect for the current vehicle operation.

Conditions for Running the DTC

* The ignition switch is in Unlock, Accessory, Run or Crank.
* The system voltage is more than 5.23 V.
* DTCs P0601, P0602, P0603, P0604, P0606, P0607, P062F, P0641, P0651, P2610 and U0101 are not set.

Conditions for Setting the DTC

The ECM detects that the TCM engine speed request circuit does not match the expected engine speed request circuit. Each test runs in 5 milliseconds. This DTC runs continuously.

Action Taken When the DTC Sets

DTC P150C is a Type B DTC.

Conditions for Clearing the DTC

DTC P150C is a Type B DTC.

Reference Information
Description and Operation

Engine Control Module Description Description and Operation
DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference

Engine Control Module Scan Tool Information (LFX or LFW) Scan Tool Testing and ProceduresEngine Control Module Scan Tool Information (LS9 or LSA) Scan Tool Testing and Proceduresfor scan tool information

Circuit/System Verification

Note: Correct any other engine controls and communication DTCs before diagnosing TCM DTCs.

1. DTC P150C is an informational DTC. If there are no engine controls or communication DTCs, refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle for diagnosis of TCM DTCs. Do not replace the ECM for this DTC.
2. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

Control Module References Control Module Referencesfor K71 ECM replacement, setup, and programming