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P0021 Engine Diagnostic Code For Cadillac Cts

Sample P0021 Engine

P0021 engine code for Cadillac Cts provides below are generic codes that may not apply to all vehicles. Cadillac Cts manufacturer uses specific Cadillac Cts diagnostic code that are different from the codes shown below. Foreign vehicles may also use DTC codes different from the generic DTC codes.

On 1999 and later P0021 engines, the instrument cluster has a built-in self-diagnostic mode that can be accessed by pressing and holding the instrument cluster SELECT/RESET button. Insert the ignition key and turn to the RUN position (but don't crank or start engine). Continue to press and hold the SELECT/RESET button (for 5 seconds) until the word TEST is displayed by the odometer. Release the SELECT/RESET button within three seconds after the word TEST is displayed to begin the self-diagnostic mode.

P0021 Diagnostic Trouble Code For Cadillac Cts Meaning

P 0 0 21
Powertrain Problem SAE - Generic Transmission 21 Engine Fault Code
Cadillac Cts Car Engine How to fix P0021 engine diagnostic code For Cadillac Cts ?

Starting letter P diagnostic code shows that there are problems in engine, transmission and emissions systems.
If your "Check Engine Light" is on, it means your vehicle has one or more OBD II Trouble Codes so you have to check your engine diagnostic code tool.

If your vehicle is an older model with a non-electronic Transmission, you can check the distributor cap to see whether the spark is getting from there to the coil and on to the spark plugs.


Don't forget ! If your P0021 engine code not resolved on and there are trouble codes in your computer, your vehicle will not pass an OBD 2 emissions test. The light must be off and there must be no codes in memory to pass an OBD 2 emissions test. In addition, all of the OBD II self-monitors that check for faults must have run and completed without finding any further problems to pass the test.