Fault code lookup

PowertrainP0668

Serious

Severity: Serious - have it checked soon

Control Module Internal Temperature Sensor A Circuit Low

32 brands affected · Generic SAE J2012 description.

Key terms: Control module: a small computer that runs one part of the car · SAE J2012: the standard generic code list · Powertrain: engine, transmission and emissions

1What it means in plain English

The engine computer or one of its output circuits has a fault.

2Common causes

  1. Engine control module fault
  2. Power or ground connection problem
  3. Low battery or charging voltage
  4. Wiring short or open circuit
  5. Software or memory fault

3Can I drive?

Serious · drive with care

If the engine runs normally, drive carefully to a workshop for diagnosis. If it runs badly, stalls, or will not restart, have the car towed.

This page gives general information. It is not professional advice. For a definite diagnosis and a repair quote, ask a qualified mechanic to inspect the car.

4Brand data 32

BrandCodeDescriptionSystem
Ashok Leyland CVP0668Camshaft Position 'A' Actuator Circuit (Bank 2). Operation Failure. Stuck On BrandPowertrain
BAIC MotorP0668PCM/ECM/TCM Internal Temperature Sensor Circuit Low BrandPowertrain
Mercedes-BenzP0668Control Module Internal Temperature Sensor A Circuit Low SAEPowertrain
BYDP0668PCM/ECM/TCM Internal Temperature Sensor Circuit Low BrandPowertrain
CheryP0668Internal Temperature Sensor: Too Low BrandPowertrain
ChryslerP0668PCM/ECM/TCM Internal Temperature Sensor 1 Circuit Low BrandPowertrain
DaewooP0668PCM/ECM/TCM Internal Temperature Sensor Circuit Low BrandPowertrain
DFFSP0668ECU internal fault: not characterized BrandPowertrain
DFFXP0668PCM/ECM/TCM Internal Temperature Sensor Circuit Low BrandPowertrain
DFXKP0668Internal Temperature Sensor: Too Low BrandPowertrain
EOBDP0668Litar sensor suhu dalaman modul kawalan 'A' rendah BrandPowertrain
FiatP0668PCM/ECM/TCM Internal temperature sensor 1 circuit low BrandPowertrain
GeelyP0668Internal Temperature Sensor: Too Low BrandPowertrain
GMP0668PCM/ECM/TCM Internal Temperature Sensor Circuit Low BrandPowertrain
Great WallP0668ECU temperature sensor signal low BrandPowertrain
HafeiP0668PCM/ECM/TCM Internal Temperature Sensor Circuit Low BrandPowertrain
HoldenP0668Control Module Internal Temperature Sensor A Circuit Low SAEPowertrain
HondaP0668Control Module Internal Temperature Sensor A Circuit Low SAEPowertrain
HyundaiP0668Control Module Internal Temperature Sensor A Circuit Low SAEPowertrain
IsuzuP0668Control Module Internal Temperature Sensor A Circuit Low SAEPowertrain
Land RoverP0668Control Module Internal Temperature Sensor A Circuit Low SAEPowertrain
MaseratiP0668Powertrain control module/Engine Control Module/TCM Internal Temperature Sensor 1 Circuit Low BrandPowertrain
MitsubishiP0668Control Module Internal Temperature Sensor A Circuit Low SAEPowertrain
OpelP0668PCM/ECM/TCM Internal Temperature Sensor Circuit Low BrandPowertrain
PeugeotP0668Control Module Internal Temperature Sensor A Circuit Low SAEPowertrain
ProtonP0668Control Module Internal Temperature Sensor A Circuit Low SAEPowertrain
SaabP0668PCM/ECM/TCM Internal Temperature Sensor Circuit Low BrandPowertrain
MG (SAIC)P0668PCM/ECM/TCM Internal Temperature Sensor Circuit Low BrandPowertrain
SprinterP0668Control Module Internal Temperature Sensor A Circuit Low SAEPowertrain
SuzukiP0668Control Module Internal Temperature Sensor A Circuit Low SAEPowertrain
TataP0668PCM/ECM/TCM Internal Temperature Sensor Circuit Low BrandPowertrain
ToyotaP0668ECU internal fault: not characterized BrandPowertrain

Legend: SAE is the generic J2012 description; Brand is text taken from that manufacturer’s data. Manufacturer rows keep the wording and language of the source data, and non-English text is tagged so screen readers pronounce it correctly.

5Extended variant codes 6

These 7-character codes are manufacturer-specific variants of P0668 and may be reported by some scan tools.

BrandCodeDescriptionSystem
Mercedes-BenzP066800TCU Internal Temperature Sensor short ground BrandPowertrain
SsangYongP066800ECU error: interior temperature sensor signal low BrandPowertrain
Mercedes-BenzP066811The internal temperature sensor of the control unit has a short circuit to ground. There is a short circuit to ground. BrandPowertrain
Mercedes-BenzP066814The internal temperature sensor of the control unit has a short circuit to ground. There is a short circuit to ground or an open circuit. BrandPowertrain
Mercedes-BenzP0668FAThe internal temperature sensor of the control unit has a short circuit to ground. R1 BrandPowertrain
Mercedes-BenzP0668FBThe internal temperature sensor of the control unit has a short circuit to ground. R2 BrandPowertrain

6Related codes

  • P0660 Intake Manifold Tuning Valve Control Circuit/Open (Bank 1)
  • P0661 Intake Manifold Tuning Valve Control Circuit Low (Bank 1)
  • P0662 Intake Manifold Tuning Valve Control Circuit High (Bank 1)
  • P0663 Intake Manifold Tuning Valve Control Circuit/Open (Bank 2)
  • P0664 Intake Manifold Tuning Valve Control Circuit Low (Bank 2)
  • P0665 Intake Manifold Tuning Valve Control Circuit High (Bank 2)
  • P0666 Control Module Internal Temperature Sensor A Circuit
  • P0667 Control Module Internal Temperature Sensor A Range/Performance
  • P0669 Control Module Internal Temperature Sensor A Circuit High
  • P066A Cylinder 1 Glow Plug Control Circuit Low
  • P066B Cylinder 1 Glow Plug Control Circuit High
  • P066C Cylinder 2 Glow Plug Control Circuit Low

Browse Pxxx codes or P066xx codes.

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