C20DD Diagnostic Trouble Code

C20DD 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 C20DD diagnostic trouble code may include:

Excessive exhaust leak
Hesitation upon acceleration
Malfunction Indicator Lamp (MIL) illuminated
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.

Possible Causes :

An air leak forward of the DPF will change the sensor readings resulting in the code
Rusty exhaust systems, cracked exhaust manifolds or damaged or missing gaskets or donuts will cause air leaks.
Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.

Repair Processes :

Pack the connector cavity with dielectric silicone compound (same stuff they use for light bulb sockets and spark plug wires) and reassemble. Look for missing ground strap or a rusty ground where the fuel tank is grounded to the frame. Check for damage to the wiring harness connector.

Process Tips

Diagnostic trouble code C20DD 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 C20DD.

Fortunately, C20DD is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C20DD Trouble Code For Specific Cars

C20DD Nissan Vanette Cylinder #4 High To Low Side Short
C20DD Moretti Moretti Blower Switch Failure
C20DD Mikasa Sports ANTI THEFT HORN OUTPUT CIRCUIT Short to Batt
C20DD Fiat 130 Knock Sensor 2 Circuit High Input (Bank 2)
C20DD Ginetta G40 Output Speed Sensor Circuit Malfunction
C20DD Peugeot Quasar Engine Coolant Temperature Circuit Range/Performance Problem
C20DD Bugatti Id 90 Cylinder #6 High To Low Side Open