Leblanc Caroline U20U3 Code:

OBD-II Diagnostic Network (U) Trouble Code

Trouble In Leblanc Caroline U20U3 Possible Cause

To know real cause of Leblanc Caroline U20U3 based of if this code is present in your two-wheel drive vehicle, suspect a faulty PCM or programming error. In most four wheel drive applications the four-wheel drive switch is used to switch between two and four wheel drive operation, as well as between low and high ranges

Common Symptoms For Leblanc Caroline U20U3

  1. If there is no low voltage (usually 5-volts) on the signal wire, disconnect the PCM connector and perform a continuity test on the wire using the digital volt/ohmmeter
  2. This will help to determine whether or not the malfunction is intermittent. After the codes are cleared, test drive the vehicle to see if the code returns
  3. After the codes are cleared, test drive the vehicle to see if the code returns
  4. 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.

Similar Problems

Accelerator Pedal Position (APP) Sensor 1 Performance
BBV Sensor Circuit Low Voltage
A/C System High Pressure High Temperature

Leblanc Caroline U20U3 Troubleshooting

White smoke means that the fuel that is being injected into the combustion chamber is not being burned properly. The common causes that produce white smoke range from something as simple as low engine compression or water in the fuel to the fuel pump timing being thrown off because something is starving the fuel from getting to the pump in the manner necessary for the pump to time and work correctly. Leblanc Caroline U20U3 OBD2 may also be triggered by faults earlier down the line. For example, a dirty MAF sensor might be causing the car to overcompensate in its fuel-trim adjustments. As a result, oxygen sensors are likely to report fuel mixture problems.

How to turn off Leblanc Caroline U20U3 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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