C2681 Diagnostic Trouble Code

C2681 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 C2681 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. Check to make sure they are not burnt or corroded. If in doubt, get some Electrical Contact cleaner at any parts store if cleaning of the terminals is needed.

Process Tips

Diagnostic trouble code C2681 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 C2681.

Fortunately, C2681 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C2681 Trouble Code For Specific Cars

C2681 Franklin Series 17 No Communication to VICS Module (No Fitting of VICS)
C2681 Chrysler E EV Battery Pack Temperature Fault
C2681 Citroen Traction Fuel Pump Speed Control Circuit Malfunction
C2681 Renault Master 3 Headlamp Mode Select Circuit Failure
C2681 Dodge Kingsway Ignition Cylinder Sensor Open Circuit
C2681 Shelby Cobra Intake Air Temperature Circuit High Input
C2681 Citroen C-elysee Fuel Filler Door Circuit Open