P0012 - "A" Camshaft Position - Timing Over-Retarded (Bank 1)

Description and meaning of DTC p0012

This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to OBD-II equipped vehicles, including but not limited to Toyota, VW, Honda, Chevrolet, Hyundai, Audi, Acura, etc. A P0012 code refers to the VVT (variable valve timing) or VCT (variable camshafttiming) components and the car's PCM (powertrain control module) or ECM (engine control module). VVT is a technology used in the engine to allow it to get greater power or efficiency at different running points. That consists of a few different components but the P0012 DTC specificallyrefers to the camshaft (cam) timing. In this case, if the cam timing is over-retarded, the engine light will be illluminated and the codewill be set. The A camshaft is either the intake, left, or frontcamshaft. This code is specific to bank 1. Bank 1 is the side of the engine that contains cylinder #1.

p0012 diagnostic trouble code symptoms

Most likely a P0012 DTC will result in one of the following:hard startingpoor idle and/orstallingThere are potentially other symptoms as well. Ofcourse, when trouble codes are set, the MIL (malfunction indicator lamp, a. k. a. the check engine light) illuminates.

DTC p0012 - possible causes

A P0012 DTC trouble code may be caused by one or more of the following:Incorrect camshaft timingWiring problems (harness/wiring) in intake timing control valve controlsolenoid systemContinuous oil flow to VCT piston chamberFailed timing valve control solenoid (stuck open)

How to fix OBD-II diagnostic trouble code p0012

The main thing to check is to verify the operation of the VCT solenoid. You're looking for a sticking or stuck VCt solenoid valve caused by contamination. Refer to vehicle specificrepair manual to perform component tests for the VCT unit. Notes: Dealer techshave advanced tools and the ability to follow detailed troubleshooting steps,including the ability to test components using a scan tool. Other related DTCs: P0010 - P0011 - P0020- P0021 - P0022

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