C20C5 Diagnostic Trouble Code

C20C5 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 C20C5 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 the engine displays a miss and there wasn't a code, determine which cylinder is misfiring. If the exhaust manifold is visible, spay or pour a small amount of water on each cylinder exhaust port. Water will evaporate immediately on good cylinders and slowly on the missing cylinder. If this can't be accomplished pull the plugs and check the condition. If the scan tool has that capability, and the scan tool can operate the IMRC valves, then the problem is either resolved and a simple code clearing is all that's left or a new PCM would be called for. 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.

Process Tips

Diagnostic trouble code C20C5 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 C20C5.

Fortunately, C20C5 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C20C5 Trouble Code For Specific Cars

C20C5 Opel Adam Damper RF Circuit Failure
C20C5 Mercedes-benz W123 Air Suspension LF Air Spring Solenoid Output Circuit Short To Battery
C20C5 Toyota F-1 O2 Sensor Signals Swapped Bank 1 Sensor 1/ Bank 2 Sensor 1
C20C5 Italdesign Twenty Seat Belt Switch Circuit Failure
C20C5 Maruti 800 Transmission 4-Wheel Drive Mode Select Short Circuit To Battery
C20C5 Datsun Laurel HO2S Heater Control Circuit (Bank 2 Sensor 1)
C20C5 Nissan Prairie COURTESY LAMP OUTPUT Ckt Short to Battery