C3990 Trouble Code

View C3990 obd/2 error code description and symptoms. C3990 engine photo

The Transmission Fluid Pressure Switch allows the engine's control module (PCM) or Transmission Control Module (TCM) to use hydraulic fluid to engage the clutches in the transmission to allow for smoother shifting while driving. If the PCM or TCM detects an issue with the hydraulic clutch or the pressure switch, the PCM or TCM will set code C3990

As the engine heats up and combustion becomes easier and more complete, the PCM will command the idling control valve to increase the amount of air entering the engine to suit the changing conditions. However, when the load on the engine changes, say, when some electrical consumers or other systems are either turned on or off, the PCM adapts the signal voltage to the idle control valve to ensure that the idling speed remains stable, and at the RPM specified by the manufacturer.

C3990 Error Code Repair Process :

For contactor circuit failure check engine light is perhaps the most troubling of lights because it could mean so many different things, from you didn't screw the gas cap on tightly enough to look out for pistons flying through the hood and into the stratosphere. The easiest way to find out what this light is telling you is to hook your vehicle up to a scan tool. C3990 error code diagnostic tool looks a little like an oversized calculator and plugs into a communication port inside the car. After you instruct it to perform the scan, it speaks contactor circuit failure with your car's computers to find out exactly what's prompting the light to turn on.

C3990 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 C3990

A common cause of code C3990 is the failure of Contactor Circuit Failure, but there are several other possible causes as well, such as ;

Continuous oil flow to the VCT piston chamber
Air fuel ratio (A/F) Sensor 1 Bank 1 harness is open or shorted
Ignition coils harness is open or shorted
Faulty ignition coil (s)

C3990 code for all cars

You can view according C3990 DTC for your car model. We selected several models to see obd2 solutions click and view it.

+C3990 Pontiac Grande Parisienne

+C3990 Koenigsegg Ccx

+C3990 Volkswagen Fox

+C3990 Moretti 1000

+C3990 Sovam 1100

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

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