U2021 Holden Calais OBD Code

OBD/2 U2021 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) U2021 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.

U2021 Holden Calais Error Code Repair Process :

For u2021 invalid /fault data received (non scp) 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. U2021 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 u2021 invalid /fault data received (non scp) with your car's computers to find out exactly what's prompting the light to turn on.

Common Causes of Holden Calais U2021 OBD2 Code

A common cause of code U2021 is the failure of U2021 Invalid /fault data received (Non SCP), but there are several other possible causes as well, such as ;

Camshaft advance mechanism binding (VCT unit)
EVAP system hose leaking
Fuel pressure
Incorrect fuel filler cap used

U2021 is a kind of Network Trouble Code

U-code indicates that engine communication errors and shows lost communication with engine parts.U-Codes are fairly straight forward, given all of the articles and technical publications that have been written regarding these problematic codes. In most cases, it just comes down to identifying the module that isn't communicating with the other modules on the CAN bus line for whatever reason.

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

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U2021 Holden Calais OBD Code

U2021 Holden Calais Error Code Repair Process :

Common Causes of Holden Calais U2021 OBD2 Code

U2021 code for other Holden cars