this may help.
A code P0025 refers to the VVT (variable valve timing) or VCT (variable camshaft timing) components and the car's PCM (powertrain control module, also called an ECM). That consists of a few different components but the P0025 DTC specifically refers to the camshaft (cam) timing In this case, if the cam timing is over-retarded, the engine light will be illluminated and the code will be set. The "B" camshaft is either the exhaust, right, or rear camshaft. Bank 2 is the side of the engine that does not contain cylinder #1. This code is nearly identical to P0022
Most likely a P0025
DTC will result in one of the following:
- hard starting
- poor idle and/or
There are potentially other symptoms as well. Of course, when trouble codes are set, the MIL (malfunction indicator lamp, a.k.a. the check engine light) illuminates.
A P0025 DTC trouble code may be caused by one or more of the following:
- Incorrect camshaft timing
- Wiring problems (harness/wiring) in intake timing control valve control solenoid system
- Continuous oil flow to VCT piston chamber
- Failed timing valve control solenoid (stuck open)
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 specific repair manual to perform component tests for the VCT unit. Notes: Dealer techs have advanced tools and the ability to follow detailed troubleshooting steps, including the ability to test components using a scan tool.