Code Definition

P0667 — ECM/TCM internal temperature circuit malfunction

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

About P0667

P0667 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 P0667 is stored, the module has detected an electrical-circuit fault in the wiring, connector, or driver associated with the named component.

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 P0667 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 P0667 is set when the Engine Control Module (ECM) or Transmission Control Module (TCM) detects a malfunction within the circuit responsible for monitoring its internal temperature. This code indicates that there is a problem in the electrical pathway that transmits the temperature readings from the internal sensor of the ECM or TCM. The internal temperature monitoring is crucial for ensuring that these control modules operate within a safe and efficient temperature range. A malfunction in this circuit can lead to incorrect temperature readings, which may affect the performance a...

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