P2981 Holden Caprice OBD Code

OBD/2 P2981 error code description and symptoms.

Variable Cam Timing Over-advanced (Bank 1) The comprehensive component monitor (CCM) monitors the VCT position for an over-advanced camshaft timing.
The test fails when the camshaft timing exceeds a maximum calibrated value or remains in an advanced position. Cam timing improperly set No oil flow to the VCT piston chamber Low oil pressure VCT solenoid valve stuck closed Camshaft advance mechanism binding (VCT unit) P2981 DTC is a check of the VCT unit.

One example of this would be when an automatic vehicle in placed in gear. To prevent the added drag from the torque converter and transmission from reducing the idling speed, the PCM will command the idle control valve to allow more air to enter the engine, while at the same time, adjusting the injector pulse width to inject more fuel to suit the increased amount of air. Note that the idle air control valve is closed by the PCM when the throttle plate is opened to prevent excess air from entering the engine.

P2981 Holden Caprice Error Code Repair Process :

If your climate control air temperature internal sensor motor circuit short to battery 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 P2981 and engine control unit are in charge of monitoring a bunch of different climate control air temperature internal sensor motor circuit short to battery, and if they get a reading that's a little out of whack, up pops the check engine light.

Common Causes of Holden Caprice P2981 OBD2 Code

A common cause of code P2981 is the failure of Climate Control Air Temperature Internal Sensor Motor Circuit Short To Battery, but there are several other possible causes as well, such as ;

Camshaft advance mechanism binding (VCT unit)
Faulty spark plug (s)
Faulty oil control valve (OCV)
Ignition coils circuit poor electrical connection

P2981 is a kind of Powertrain Trouble Code

Powertrain of a modern automobile, comprising engine (with exhaust system), transmission, drive shaft, suspension and the wheels. In a motor vehicle, the term powertrain or powerplant describes the main components that generate power and deliver it to the road surface, water, or air.

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

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P2981 Holden Caprice OBD Code

P2981 Holden Caprice Error Code Repair Process :

Common Causes of Holden Caprice P2981 OBD2 Code

P2981 code for other Holden cars