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U2021 Engine Trouble Code

Meaning of U2021 engine trouble code is a kind of network trouble code and theoretically you can drive for a few weeks or even months with a broken MAF sensor. You will notice a decrease in gas mileage and over time the car will eventually start stalling a lot. At a shop, the replacement cost is between $200-$300 depending on the car, but that's usually the cost of parts because the labor is relatively simple.

U2021 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 U2021 code is occuring now you should check U2021 repair processes.
Now don't ask yourself; What should you do with U2021 code ?
The solution is here :

U2021 Possible Solution:

U2021 Engine

Power Steering Pressure (PSP) Switch Malfunction In Key On, Engine Off Self-Test, this DTC indicates the PSP input to the PCM is high. In Key On, Engine Running Self-Test, this DTC indicates that the PSP input did not change state. Steering wheel must be turned during Key On, Engine Running Self-Test PSP switch/shorting bar damaged SIG RTN circuit open PSP circuit open or shorted to SIGRTN PCM damaged.

U2021 Code Meaning :

U 2 0 2 1
OBD-II Diagnostic Network (U) Trouble Code For Engine Fuel And Air Metering (Injector Circuit Malfunctions Only) Ambient Air Temperature Sensor Circuit Low Turbocharger Boost Sensor A Circuit Low Crankshaft Position Sensor A Circuit Low Input

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.

U2021 OBD-II Diagnostic Network (U) Trouble Code Description

U2021 engine trouble code is about Crankshaft Position Sensor A Circuit Low Input.

Main reason For U2021 Code

The reason of U2021 OBD-II Engine Trouble Code is Ambient Air Temperature Sensor Circuit Low.

U2021 DTC reports a sensor fault, replacement of the sensor is unlikely to resolve the underlying problem. The fault is most likely to be caused by the systems that the sensor is monitoring, but might even be caused by the wiring to the sensor itself.