MG RV U3952 Code:

OBD-II Diagnostic Network (U) Trouble Code

Trouble In MG RV U3952 Possible Cause

Common cause for MG RV U3952 is the valve is controlled by the PCM (or a similar controller) using inputs from sensors and other controllers in the controller area network (CAN). The CAN represents a communication bus that allows multiple microcontrollers.

Common Symptoms For MG RV U3952

  1. If voltage and ground signals do not comply with manufacturer's recommendations (and all fuses and relays have been tested and passed) disconnect the fuel shutoff valve connector and all related control module connectors, then perform a continuity and resistance test on all related circuits
  2. Should all system circuitry and sensors check out and the transmission is in good working order, suspect a faulty PCM but keep in mind that PCM failure is rare and PCM replacement will require reprogramming.
  3. If either the reference voltage or ground circuits are open, use the digital volt/ohmmeter to check for continuity (disconnect all related control modules from the circuit before checking circuit resistance or controller damage may occur) and resistance in both circuits
  4. Individual control module failure is rare but possible

Similar Problems

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MG RV U3952 Troubleshooting

A sure sign of this is smoke or steam being emitted from underneath the hood. The ignition timing could be set incorrectly and will require adjustment. If, when looking under the hood, you notice that the drive belts appear loose, they need to be tightened or completely replaced. If there is a noticeable pool of fluid underneath the car, this could be a sign of the cylinder head gasket failing. That will be confirmed in the form of billowing smoke being blown from the exhaust system. MG RV U3952 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 MG RV U3952 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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