Holden LH U1420 Code:

OBD-II Diagnostic Network (U) Trouble Code

Trouble In Holden LH U1420 Possible Cause

Holden LH U1420 leads to an unsuccessful repair. Engine misfire codes, lean exhaust codes, fuel injector codes, and virtually any other drivability or transmission code that is accompanied by a controller communication code can potentially be a pitfall for misdiagnosis.

Common Symptoms For Holden LH U1420

  1. 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 to communicate with one another without the need for a host computer
  2. Engine and transmission ground cables, straps, and wires are sometimes left dangling after repairs are performed
  3. If the fluid smells or appears burned, remove the transmission pan and check for the presence of clutch material and other debris
  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

Ignition System Or Misfire
Exhaust Gas Recirculation System Valve 1
Transmission Engaged At High Throttle Angle

Holden LH U1420 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. Holden LH U1420 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 Holden LH U1420 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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