Code Definition

P150C — Engine Speed Request Signal Message Counter Incorrect

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Holden

About P150C

P150C is a manufacturer-specific powertrain diagnostic trouble code recorded for Holden vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

P150C is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The Engine Control Module (ECM) communicates with other control modules, typically the Transmission Control Module (TCM) or Body Control Module (BCM), over the high speed CAN bus to exchange engine speed request data. DTC P150C is set when the ECM detects that the message counter associated with the engine speed request signal is not incrementing correctly, is implausible, or is missing compared to expected values. This indicates a communication integrity fault rather than an engine speed measurement error, suggesting lost, corrupted, or out of sequence CAN messages. When the code is set the d...

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