U0660 Code:

OBD-II Diagnostic Network (U) Trouble Code

Possible Cause

Common cause for U0660 is the valve is controlled by the PCM (or a similar controller) using inputs from sensors and other controllers in the controller area network (CAN). The CAN represents a communication bus that allows multiple microcontrollers.

Common Symptoms

  1. Pay particular attention to wiring and connectors that have been contaminated due to engine oil or transmission fluid leaks, burned on hot exhaust pipes, or damaged due to road debris. Inconsistencies between the input and output speed sensor readings may be interpreted by the PCM as a transmission friction element application malfunction
  2. If either the reference voltage or ground circuits are open, use the digital volt/ohmmeter to check for continuity (disconnect all related control modules from the circuit before checking circuit resistance or controller damage may occur) and resistance in all circuits
  3. Many vehicle applications utilize an electronically controlled valve in the automatic transmission cooler lines to regulate the flow of fluid to the cooler itself
  4. If the code fails to immediately return, you may have an intermittent condition

Similar Problems

Auxiliary Emission Controls
Air Conditioning (A/C) Clutch Feedback Circuit High Voltage
Transmission Engaged At High Throttle Angle

U0660 Troubleshooting

Having one of the signs of a bad gasket is usually not enough to prove a failure of a gasket, but multiple symptoms are most likely the result of gasket failure. It is advisable to have the vehicle driven as little as possible whenever the symptoms occur. Depending on the symptoms, either have the gasket replaced or repaired.
The cost of replacing a gasket usually varies from one mechanic to the other. Replacing a gasket is quite expensive in modern engines due to their location and the amount of labor that is required to replace them. U0660 OBD 2 code on vehicles with electronically controlled automatic transmissions, the 3-4 shift solenoid is responsible for actuating the hydraulic circuits to activate clutches or bands that change gears inside the automatic transmission.

How to turn off U0660 check engine light ?

There are two ways to turn off the check engine light:

A repair technician can do so once repairs have been made.
The OBD II can automatically turn it off when it fails to detect the problem after several diagnostic cycles.

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