C2788 Diagnostic Trouble Code

C2788 is a kind of OBD-II Diagnostic C-Chassis 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 C2788 diagnostic trouble code may include:

If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected
Corroded or damaged connector
Reduction in engine performance, especially at low RPM levels
Malfunction Indicator Lamp (MIL) illuminated

Possible Causes :

Dirty air cleaner element Damaged DPF
A plugged converter will cause of host of driveability problems as well as set this code. A severely plugged converter will result in the inability to increase rpm when under load. Look for a code such as P0421 -- catalytic converter efficiency below threshold if the converter indicating a faulty converter.
Fuel with a large percentage of sulfur will clog the DPF quickly

Repair Processes :

If all testing has passed so far yet you still have the same code, check your scan tool and see if it can open and close the IMRC valve. Look for damage to the tank indicating impact that may have damaged the fuel pump or sender.

Process Tips

Diagnostic trouble code C2788 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 C2788.

Fortunately, C2788 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C2788 Trouble Code For Specific Cars

C2788 Bristol 402 Cooling Fan Driver Fault
C2788 Rover 200 Idle Switch (Electric Control Throttle) Circuit Malfunction
C2788 Datsun 1000 Heater Blower Relay Circuit Failure
C2788 Volvo V70 Ii SCP (J1850) Invalid or Missing Data for External Lamp Outage
C2788 Proton Satria Fuel Tank Pressure Sensor Circuit Failure
C2788 Triumph Vitesse Pedal Demand Sensor B Circuit High Input
C2788 Opel Corsa C Decklid Release Circuit Short To Ground