P0667

PCM/ECM/TCM Internal Temperature Sensor Range/Performance

P0667 is a generic OBD-II powertrain diagnostic trouble code: PCM/ECM/TCM Internal Temperature Sensor Range/Performance. It is logged by the engine control unit when the powertrain monitor detects that a specific fault threshold has been exceeded — typically resulting in the malfunction-indicator lamp (MIL / check-engine light) being illuminated.

Code
P0667
Group
Powertrain
System
Powertrain
Severity
Warning (MIL on)
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What P0667 means

P0667 is set when the powertrain, engine, or transmission control module detects that its internal temperature sensor signal is out of range or not performing consistently with expected values. Control modules include a built-in temperature sensor used to protect internal electronics from overheating and to compensate calculations that depend on module temperature.

The module compares the internal temperature reading against plausibility limits and may cross-check it against ambient air or coolant temperature. A value that is implausibly high, low, or erratic for current conditions sets the code and illuminates the check engine or transmission warning lamp. While the sensor is built into the module, the reference and signal circuits can still be affected by the module connector, power supply, and ground, so external inspection is warranted before condemning the module.

Severity varies. In mild cases the vehicle runs normally with only the lamp on, but a genuine overtemperature condition or a corrupted reading can trigger protective strategies, and some vehicles may stall or fail to start. Because misdiagnosis often leads to needless module replacement, technicians should verify wiring, grounds, connections, and power supply first.

Common causes

Most-frequently reported root causes when P0667 is logged.

  • 1
    Failed or degraded internal temperature sensing element within the module.
  • 2
    Poor power supply or ground to the control module affecting the reference voltage.
  • 3
    Corroded, loose, or damaged module connector pins.
  • 4
    Water intrusion or moisture in the module housing or connector cavity.
  • 5
    Genuine overtemperature from a missing heat shield or exhaust proximity.
  • 6
    Damaged wiring near the module affecting the reference circuit.
  • 7
    Module hardware fault producing abnormal internal thermal readings.
  • 8
    Corrupted module software misinterpreting the internal temperature signal.

Symptoms drivers notice

Check engine light or transmission warning lamp illuminated.
Often no obvious drivability symptoms in mild cases.
Reduced engine power if thermal protection is activated.
Possible stalling or hard-start in severe cases.
Other internal module or reference codes may be stored alongside it.

How to diagnose P0667

A typical diagnostic flow when this code is present.

  1. 1
    Record all stored DTCs and freeze frame data, noting any companion module codes.
  2. 2
    Verify the module power supply and ground voltages meet specification.
  3. 3
    Inspect the module main connector for moisture, corrosion, or bent pins.
  4. 4
    Check the module mounting for heat damage, exhaust proximity, or a missing heat shield.
  5. 5
    Compare the reported internal temperature to ambient and coolant temperature using live data if supported.
  6. 6
    Apply a module software update if a relevant calibration is available.
  7. 7
    If wiring, grounds, and environment are good but the fault persists, evaluate the module for internal failure.

Related powertrain codes

Frequently asked questions

Can high underhood temperatures cause P0667?

Yes. Genuine overheating from a missing heat shield or close exhaust proximity can drive the internal temperature out of range without any hardware fault.

Is P0667 a critical fault?

Usually it is a warning-level code, but severity varies and in some cases the vehicle may stall or fail to start, so it should be diagnosed promptly.

Do I have to replace the module to fix P0667?

Not necessarily. Faulty grounds, connectors, power supply, or software are common causes, so eliminate those before replacing the module.

Can moisture cause this code?

Yes. Moisture or corrosion in the module connector or housing can corrupt the internal sensor signal and set P0667.

Disabling P0667 in software

RaceTune can permanently disable P0667 — and any other OBD-II diagnostic trouble code — on every ECU family we support. The monitor is disabled inside the ECU itself, so the fault stops being logged: the warning light stays off and the engine never enters limp mode for this code. The change is tied to your exact software version.

Permanent
The monitor is disabled in the ECU itself — not just cleared. It cannot return.
Tailored to your file
Each patch is matched to your specific software version — never a one-size-fits-all file.
Reversible
The original file is always preserved. Reflash the stock to return the ECU to factory state.

ECU families we can disable P0667 on

We hold the DaVinci A2L disable definitions for these families, so the exact P0667 path and mask addresses are mapped. verified marks a confirmed disable definition. We support many more — upload your file and our identifier will match it automatically.

  • Bosch EDC17C66 verified
  • Bosch EDC17C74 verified
  • Bosch EDC17CP57 verified
  • Bosch MG1CP002 verified

Software modifications affect emissions compliance and are not road-legal in many jurisdictions. RaceTune service files are intended for motorsport, off-road, and export use.

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