P0788 Diagnostic Trouble Code

P0788 is a kind of OBD-II Diagnostic P-Powertrain 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 P0788 diagnostic trouble code may include:

Reduction in engine performance, especially at low RPM levels
Vacuum leak on the engine
Diminished fuel efficiency
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected

Possible Causes :

Fuel with a large percentage of sulfur will clog the DPF quickly
The Mass Airflow sensor will also cause this problem. Mass Airflow circuit malfunction.
Dirty air cleaner element Damaged DPF

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. Look at the plug wires to make sure they are not burnt or laying on the exhaust. It should be pretty close to battery voltage (12 volts). If not, then this is the circuit that has the problem.

Process Tips

Diagnostic trouble code P0788 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 P0788.

Fortunately, P0788 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P0788 Trouble Code For Specific Cars

P0788 Austin-healey 3000 Aux A/C Mode Position Reference Circuit Short to Battery
P0788 International Harvester Travelall SCP (J1850) Invalid or Missing Data for Memory Storage
P0788 Healey Silverstone Passenger's Front Seat Up Switch Circuit Short to Battery
P0788 Alfa Romeo 1750 ABS Power Relay Output Circuit Failure
P0788 Emf 30 Injection Pump Fuel Metering Control "A" Range/Performance (Cam/Rotor/Injector)
P0788 Fiat Tempra Left Front Sensor Circuit Failure
P0788 Mg F Air Suspension RR Air Spring/Shock Solenoid Output Circuit Short To Ground