U2542 Diagnostic Trouble Code

U2542 is a kind of OBD-II Diagnostic U-Network Diagnostic Trouble Code.

It is considered generic because it applies to all makes and models of vehicles, although specific repair steps may be different depending on your car model.

Symptoms

Symptoms of a U2542 diagnostic trouble code may include:

Faulty PCM
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
Poor acceleration
Hesitation upon acceleration

Possible Causes :

Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.
Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.
A large air leak at or near the number one oxygen sensor would also cause a lean mixture.

Repair Processes :

Look for damage to the tank indicating impact that may have damaged the fuel pump or sender. Look at the plug wires to make sure they are not burnt or laying on the exhaust. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors. Pull the connectors apart and carefully look at the terminals (the metal parts) inside the connectors.

Process Tips

Diagnostic trouble code U2542 is not difficult to diagnose and repair. Thus, it always pays to have a qualified technician to look after your vehicle should this error code arise.

Diagnosing this code requires the engine to be in good running shape, without unmetered air entering the engine. If other codes that relates to misfiring condition, lean running or air entering the engine is present, then you must first fix those error codes before U2542.

Fortunately, U2542 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U2542 Trouble Code For Specific Cars

U2542 Smart Brabus Lamp ABS Warning Output Circuit Failure
U2542 Buick Electra Cylinder 7 Contribution/Balance Fault
U2542 Moretti 850 Blend Door Failure
U2542 Daewoo Arcadia Fuel Trim Malfunction (Bank 1)
U2542 Opel P 1200 Door Ajar RR Circuit Open
U2542 Smart Fortwo I Lamp Air Bag Warning Indicator Circuit Short To Battery
U2542 Holden Td Power Window LR Motor Circuit Short To Ground