U3820 Diagnostic Trouble Code

U3820 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 U3820 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. You might continue by connecting the scanner to the vehicle diagnostic connector and retrieving all stored codes and freeze frame data.

Process Tips

Diagnostic trouble code U3820 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 U3820.

Fortunately, U3820 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U3820 Trouble Code For Specific Cars

U3820 Italdesign Columbus SCP (J1850) Invalid or Missing Data for Windows
U3820 Lada Samara Shift Solenoid C Control Circuit Low
U3820 Ford Comete Low Fan Control Primary Circuit Malfunction
U3820 Hyundai Xg
U3820 Sunbeam Alpine Manifold Absolute Pressure/Barometric Pressure Circuit Range/Performance Problem
U3820 Itala Racecar SCP (J1850) Invalid or Missing Data for Vehicle Speed Control
U3820 Magna Steyr Mila Traction Control Valve LF Circuit Short To Battery