U251C Nissan Alpha OBD Code

OBD/2 U251C 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) U251C DTC is a check of the VCT unit.

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.

U251C Nissan Alpha Error Code Repair Process :

If your air suspension lr air spring/shock solenoid output circuit short to 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 U251C and engine control unit are in charge of monitoring a bunch of different air suspension lr air spring/shock solenoid output circuit short to ground, and if they get a reading that's a little out of whack, up pops the check engine light.

Common Causes of Nissan Alpha U251C OBD2 Code

A common cause of code U251C is the failure of Air Suspension LR Air Spring/Shock Solenoid Output Circuit Short To Ground, but there are several other possible causes as well, such as ;

Camshaft advance mechanism binding (VCT unit)
Dirty Oil
Fuel injector leaks
1Camshaft Position Sensor circuit poor electrical connection

U251C 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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U251C Nissan Alpha OBD Code

U251C Nissan Alpha Error Code Repair Process :

Common Causes of Nissan Alpha U251C OBD2 Code

U251C code for other Nissan cars