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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 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

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Engine Control Module Scan Tool Information (LF1,LFW) for scan tool information

Circuit/System Verification


1. Ignition ON, check the diagnostic trouble code (DTC) information with a scan tool. DTC U0101 should not be set.

2. If DTC U0101 is set, repair that DTC first.

3. Note the DTC information with a diagnostic tool. DTCs P0601, P0603, P0604, P0606, P0607, P0610, P062B, P0630, P167D, or P2610 should not set. If a DTC failed this ignition, replace the K20 ECM. 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.


Circuit/System Testing

Replace the K71 TCM.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

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