U2340 Code:

OBD-II Diagnostic Network (U) Trouble Code

Possible Cause

Common Symptoms

  1. Always retest the system after repairs are completed to ensure success. If all system wiring, connectors, and components (Including fuses) appear to be in normal working order, connect the scanner (or code reader) to the diagnostic connector and record all stored codes and freeze frame data
  2. Engine and transmission ground cables, straps, and wires are sometimes left dangling after repairs are performed
  3. Several tools will be instrumental in successfully diagnosing this code
  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

Fuel And Air Metering (Injector Circuit Malfunctions Only)
IC Circuit High Voltage
Transmission Engaged At High Throttle Angle

U2340 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. U2340 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 U2340 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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