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U2921 Engine Code Repair

Meaning of U2921 engine trouble code is a kind of network trouble code and when the check engine light comes U2921 code on the first you should check is the gas cap. Pull over, retighten it, and take a look at the cap to see if it has any cracks in it. Continue driving and see if the check engine light turns off. Alternately, you can purchase a gas cap for about $3 at an auto parts store. All you need to do is take the old one off and screw on the new one. If you've already made it to the store, you might as well just replace it. While not car-threatening, it's good to take care of this right away to improve gas mileage.

U2921 Fault Symptoms :

  1. Check engine light comes on
  2. Engine stalling or misfiring
  3. Engine performance issues
  4. Car not starting

If one of these reasons for U2921 code is occuring now you should check U2921 repair processes.
Now don't ask yourself; What should you do with U2921 code ?
The solution is here :

U2921 Possible Solution:

U2921 Engine

Air Conditioning Pressure Sensor (ACP) Insufficient Pressure Change Each time the A/C clutch engages, the PCM is looking for a pressure change in the refrigerant. If the change in pressure is outside of the calibration the DTC will set. A/C system mechanical failure Open ACP or VREF circuit A/C sensor damaged A/C system electrical failure A/C clutch always engaged Verify A/C system function, including refrigerant charge.

U2921 Code Meaning :

U
OBD-II Diagnostic Network (U) Trouble Code For Engine

2
Fuel And Air Metering (Injector Circuit Malfunctions Only)

9
Engine Oil Temperature Sensor Malfunction

2
Engine Shutoff Solenoid Malfunction

1
Shift Solenoid E Performance or Stuck Off

The poor running symptoms are consistent with a MAP sensor malfunction. In addition, in some cases, a bad MAP sensor will not throw a code. Again, the ELD code likely represents a separate wiring issue.

U2921 OBD-II Diagnostic Network (U) Trouble Code Description

U2921 engine trouble code is about Shift Solenoid E Performance or Stuck Off.

Main reason For U2921 Code

The reason of U2921 OBD-II Engine Trouble Code is Engine Oil Temperature Sensor Malfunction.

U2921 DTC specifically refers to the camshaft (cam) timing. In this case, if the cam timing is over-retarded, the engine light will be illluminated and the code will be set.