C3421 Trouble Code

View C3421 obd/2 error code description and symptoms. C3421 engine photo

Output Shaft Speed sensor circuit intermittent failure The output shaft speed sensor signal to the PCM is irregular or interrupted.
Harness connector not properly seated Harness intermittently shorted, or open Harness connector damaged OSS sensor damaged, or not installed properly Verify harness and connector integrity Verify OSS sensor proper installation.

As long as the throttle plate remains closed, the idling speed and quality is controlled by the PCM via the idle control valve, and as can be seen from the above it should be clear that idle control on a gasoline engine is a complex affair. For instance, if the engine is started in sub-zero temperatures, the PCM will command the idling control valve to allow less air to enter the engine to enrich the air/fuel mixture to create a condition which is roughly analogous to how chokes worked on carburetted engines to control idling in cold weather.

C3421 Error Code Repair Process :

If your driver mirror power driver circuit short ground check engine light is illuminated, it's best to take it in for diagnostic testing, which can feel like a hassle. Because while the lights vary in appearance from vehicle to vehicle, all have the same basic meaning: There's a problem with the car's emissions system. The on-board diagnostics system C3421 and engine control unit are in charge of monitoring a bunch of different driver mirror power driver circuit short ground, and if they get a reading that's a little out of whack, up pops the check engine light.

C3421 is a kind of Chassis Trouble Code

Diagnosing chassis noises can be one of the most frustrating problems technicians face. Fortunately, manufacturers have engineered noise, vibration and harshness (NVH) diagnostic techniques and equipment to find the source of the noise.

Common Causes of C3421

A common cause of code C3421 is the failure of Driver Mirror Power Driver Circuit Short Ground, but there are several other possible causes as well, such as ;

Camshaft Position Sensor harness is open or shorted
Faulty starter motor
Exhaust tube
Open circuits caused by damage to wiring.

C3421 code for all cars

You can view according C3421 DTC for your car model. We selected several models to see obd2 solutions click and view it.

+C3421 Ac 3000

+C3421 Ferrari Pinin

+C3421 Lada Largus

+C3421 Packard Mayfair

+C3421 Ginetta G20

Engine OBD 2 Codes website is a freeware resource center for engine trouble codes.

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