CG 1200 U3871 Code:

OBD-II Diagnostic Network (U) Trouble Code

Trouble In CG 1200 U3871 Possible Cause

CG 1200 U3871 code applies to vehicles equipped with dual clutch adaptive transmissions, automated manual transmissions, manual transmissions and automatic transmissions. Technicians also report the presence of excessive corrosion in the sensor connector as the cause of this code being stored.

Common Symptoms For CG 1200 U3871

  1. Replacement of virtually all of these control modules will require reprogramming
  2. This signal is systematically forwarded to affected control modules that utilize the data to accomplish various other tasks
  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. As exhaust temperature decreases (with the engine off), circuit resistance increases and the feedback voltage signal to the PCM decreases

Similar Problems

Computer And Auxiliary Outputs
Cruise Control Servo Indicates Low
Cruise Vehicle Speed/Set Speed Difference Too High

CG 1200 U3871 Troubleshooting

Having one of the signs of a bad gasket is usually not enough to prove a failure of a gasket, but multiple symptoms are most likely the result of gasket failure. It is advisable to have the vehicle driven as little as possible whenever the symptoms occur. Depending on the symptoms, either have the gasket replaced or repaired.
The cost of replacing a gasket usually varies from one mechanic to the other. Replacing a gasket is quite expensive in modern engines due to their location and the amount of labor that is required to replace them. CG 1200 U3871 OBD2 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.

How to turn off CG 1200 U3871 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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