C0525 Code:

OBD-II Diagnostic Chassis (C) Trouble Code

Possible Cause

The most common cause for this C0525 type of failure is due to liquids spilled on the upshift/downshift switch. Open or shorted electrical wiring, damaged, corroded, or disconnected wiring or connectors are also a viable possibility.

Common Symptoms

  1. Turbocharged applications may place the exhaust gas temperature sensor in the exhaust input pipe, near the turbocharger
  2. Engine and transmission ground cables, straps, and wires are sometimes left dangling after repairs are performed
  3. Many vehicle applications utilize an electronically controlled valve in the automatic transmission cooler lines to regulate the flow of fluid to the cooler itself
  4. There are several tools which will be instrumental in attempting to successfully diagnose the conditions which contribute to this code being stored

Similar Problems

Transmission
Exhaust Gas Recirculation System Valve 1
Park/Neutral Postion (PNP) Switch Circuit Engine Torque Signal Circuit

C0525 Troubleshooting

If there is a clicking noise when you attempt to start the engine and the engine does not crank, it typically means there is something wrong with the battery, such as a low or discharged battery or corroded or loose battery cables. If the engine cranks when you attempt to start the car, but fails to turn over, this may mean there is a problem with the fuel or ignition. Other common reasons an engine may fail to start include a failure of the starter motor relay, a clogged fuel filter, a defective fuel pump or an ignition switch failure. C0525 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.

How to turn off C0525 check engine light ?

There are two ways to turn off the check engine light:

A repair technician can do so once repairs have been made.
The OBD II can automatically turn it off when it fails to detect the problem after several diagnostic cycles.

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