Code Definition

P064C — Glow plug control module circuit malfunction

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P064C

P064C is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P064C is stored, the module has detected a signal or supply voltage lower than the expected operating range.

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.

Because P064C is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The fault code P064C is set when the Engine Control Module (ECM) detects a problem with the Glow Plug Control Module (GPCM). This diagnostic trouble code indicates an issue with the functionality or communication of the GPCM, which is responsible for controlling the operation of the glow plugs in diesel engines. The problem could be related to an internal malfunction within the GPCM, issues with the wiring or connectors, or problems with the ECM's ability to communicate with the GPCM.

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