U0788 Diagnostic Trouble Code

U0788 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 U0788 diagnostic trouble code may include:

Fuel pressure too high
Diminished fuel efficiency
Rich or lean exhaust
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.
Faulty IMRC actuator relay (if equipped)

Repair Processes :

Look for damage to the tank indicating impact that may have damaged the fuel pump or sender. Pack the connector cavity with dielectric silicone compound (same stuff they use for light bulb sockets and spark plug wires) and reassemble.

Process Tips

Diagnostic trouble code U0788 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 U0788.

Fortunately, U0788 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U0788 Trouble Code For Specific Cars

U0788 Fiat Tipo Left Front Sensor Circuit Fault
U0788 Trident Venturer Passenger Solar Radiation Sensor Circuit Open
U0788 Case Y Door Ajar Lamp Circuit Open
U0788 Argyll Turbo Air Suspension LR Air Spring/Shock Solenoid Output Circuit Short To Battery
U0788 Rover 2400 Ignition Coil - Cylinder 2 - Early Activation Fault
U0788 Panhard L5 Driver Power Window One Touch Window Relay Circuit Short To Battery
U0788 Gaz 27 O2 Sensor Circuit Malfunction (Bank 1 Sensor 1)