U3838 Diagnostic Trouble Code

U3838 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 U3838 diagnostic trouble code may include:

Poor fuel economy
Possible spark knock (detonation / pre-ignition)
Misfire
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on 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 vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.

Repair Processes :

Find out what kind of system you have and verify that voltage to the fuel level sensor is present at the fuel pump wiring harness. Once located, visually inspect the connectors and wiring. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors.

Process Tips

Diagnostic trouble code U3838 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 U3838.

Fortunately, U3838 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U3838 Trouble Code For Specific Cars

U3838 Mercedes-benz Bionic Air Conditioner Refrigerant Charge Loss
U3838 Mazda Roadster 4x4 Low Switch Error
U3838 Vauxhall Wyvern Pressure Transducer Main / Primary signal Faulted
U3838 Tornado Talisman Motor # 2 Input Circuit Failure
U3838 Mitsubishi Debonair Audio Subwoofer Unit is Not Responding
U3838 Volvo 360
U3838 Bmw Convertible Climate Control Temperature Differential Circuit Open