C20A2 Diagnostic Trouble Code

C20A2 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 C20A2 diagnostic trouble code may include:

Lack of power
Faulty O2 Sensor
Poor acceleration
Engine surge

Possible Causes :

Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)
Rough running engine due to misfiring plugs. Many engines have misfire codes to indicate the cylinder effected, such as P0307 for number 7.
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 :

With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground. Pack the connector cavity with dielectric silicone compound (same stuff they use for light bulb sockets and spark plug wires) and reassemble.

Process Tips

Diagnostic trouble code C20A2 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 C20A2.

Fortunately, C20A2 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C20A2 Trouble Code For Specific Cars

C20A2 Cisitalia 303 Exhaust Valve Control Solenoid Circuit Low (Bank 2)
C20A2 Adler 12 ABS Inlet Valve Coil RF Circuit Short To Ground
C20A2 Ferrari F512 Internal Voltage Regulator Malfunction
C20A2 Calthorpe Minor Door Ajar Circuit Short To Battery
C20A2 Vauxhall Meriva Pressure Control Solenoid B Control Circuit High
C20A2 Apollo Gt Air Suspension LF Height Sensor Circuit Short To Ground
C20A2 Renault Dauphine Gear Shift Position Circuit Low