C2291 Diagnostic Trouble Code
C2291 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 C2291 diagnostic trouble code may include:
- Corroded or damaged connector
- If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected
- Lack of power
- The engine oil will exhibit dilution from the ECUs attempts to increase engine temperature. Some vehicles advance the fuel injection timing slightly after top center to afterburn a small amount of fuel to increase exhaust temperatures. Some of this fuel enters the crankcase. When the ECU determines the necessity to regenerate the DPF, the service life of the oil be shortened significantly
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Possible Causes :
- A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.
- Faulty IMRC actuator/sensor
- Rough running engine due to misfiring plugs. Many engines have misfire codes to indicate the cylinder effected, such as P0307 for number 7.
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Repair Processes :
Look at the plug wires to make sure they are not burnt or laying on the exhaust.
If you find a related TSB, the information will often help in diagnosing the code in question as TSBs are crested from many thousands of repairs.
Look for damage to the tank indicating impact that may have damaged the fuel pump or sender.
Process Tips
Diagnostic trouble code C2291 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 C2291.
Fortunately, C2291 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.
C2291 Trouble Code For Specific Cars
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