C20AD Diagnostic Trouble Code

C20AD 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 C20AD diagnostic trouble code may include:

Rich or lean exhaust
Fuel pressure too low
Engine surge
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected

Possible Causes :

A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
Faulty IMRC actuator relay (if equipped)
Faulty IMRC actuator/sensor

Repair Processes :

It should be pretty close to battery voltage (12 volts). If not, then this is the circuit that has the problem. 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 C20AD 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 C20AD.

Fortunately, C20AD is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C20AD Trouble Code For Specific Cars

C20AD Volkswagen Lupo Right Rear Backup Lamp Circuit Short to Battery
C20AD Ferrari 375 Intake Air Temperature Circuit Range/Performance Problem
C20AD Nsu Sport Cylinder 12 Injector Circuit High
C20AD Mitsubishi Pistachio Aux Heater Coolant Sensor Circuit Open
C20AD Audi Ur Audio Phone is Not Responding
C20AD Kaiser Dragon Seat Horizontal Forward/Rearward Potentiometer Feedback Circuit Failure
C20AD Mazda Mazda 6 Ii Turbocharger Boost Sensor A Circuit Low