OBD Guide
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P0667

Control Module Internal Temperature Sensor A Range/Performance

P0667 is an OBD-II diagnostic trouble code meaning: Control Module Internal Temperature Sensor A Range/Performance. Common causes: degradation of the internal temperature sensor of the ecu with age, incorrect operation of the adc inside the ecu. Estimated repair cost: $33–889.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$33–889 (est.)

Symptoms

  • Check Engine light comes on
  • Possible unreasonable power restrictions (if the ECU “thinks” it is overheating)
  • Lack of thermal protection in case of real overheating
  • In most cases there are no visible symptoms
  • Code P0666 may appear at the same time

Causes

  • Degradation of the internal temperature sensor of the ECU with age
  • Incorrect operation of the ADC inside the ECU
  • Previous exposure to moisture or overheating on ECU electronics
  • ECU manufacturing defect
  • Mechanical vibration damage to ECU chips

How to Fix

  1. Check the ECU temperature with a pyrometer or contact thermometer under different conditions
  2. Compare the readings of the internal sensor on the scanner with the measured temperature of the ECU housing
  3. Make sure that the ECU is installed correctly and that there is no overheating.
  4. Check the ECU connectors for moisture and corrosion
  5. ECU diagnostics on a specialized stand
  6. If confirmed, repair or replacement of the ECU

Related codes

P0666P0600P0604P0605P0606

Error P0667 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P0667 code mean?

P0667 is an OBD-II diagnostic trouble code that indicates: Control Module Internal Temperature Sensor A Range/Performance

What causes a P0667 error code?

The most common causes of P0667 include: Degradation of the internal temperature sensor of the ECU with age; Incorrect operation of the ADC inside the ECU; Previous exposure to moisture or overheating on ECU electronics; ECU manufacturing defect.

How do I fix a P0667 diagnostic trouble code?

To fix P0667: Check the ECU temperature with a pyrometer or contact thermometer under different conditions. Compare the readings of the internal sensor on the scanner with the measured temperature of the ECU housing. Make sure that the ECU is installed correctly and that there is no overheating.. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P0667?

Limited driving only, diagnose soon

How much does it cost to fix P0667?

The estimated repair cost for P0667 is $33–889. Actual cost depends on your vehicle, location, and labor rates.

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