P0668 Code - PCM/ECM/TCM Internal Temperature Sensor 'A' Circuit Low

What Does P0668 Mean?

OBD-II Code Transmission may not shift properly is defined as a PCM/ECM/TCM Internal Temperature Sensor "A" Circuit Low

The engine control module (PCM) and/or Transmission Control Module has a temperature sensor built in to prevent the module from overheating. If the control module cannot accurately determine its own temperature, it will set code P0668.

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What are the common causes of P0668 ?

The P0668 code has a number of common causes:

• Faulty temperature sensor within the engine or transmission
• Faulty wiring within the temperature sensor circuits
• Overheating in the engine
• Overheating in the transmission
• Lack of coolant in the cooling system
• Defective parts in the powertrain cooling systems

How do you troubleshoot P0668 ?

You might continue by connecting the scanner to the vehicle diagnostic connector and retrieving all stored codes and freeze frame data. Look for missing ground strap or a rusty ground where the fuel tank is grounded to the frame. Check for damage to the wiring harness connector. If the engine displays a miss and there wasn't a code, determine which cylinder is misfiring. If the exhaust manifold is visible, spay or pour a small amount of water on each cylinder exhaust port. Water will evaporate immediately on good cylinders and slowly on the missing cylinder. If this can't be accomplished pull the plugs and check the condition.

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