U20CA Diagnostic Trouble Code

U20CA is a kind of OBD-II Diagnostic U-Network 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 U20CA diagnostic trouble code may include:

Excessive exhaust leak
Hesitation upon acceleration
Malfunction Indicator Lamp (MIL) illuminated
Reduction in engine performance, especially at low RPM levels

Possible Causes :

A faulty oxygen sensor. This will set a code in itself, however, a faulty oxygen sensor does not automatically condemn the sensor. The code just means that the sensor signal was not within specifications. An air leak or any of the above will cause an erroneous signal. There is a multitude of O2 codes relating to O2 performance which gives a clue to the problematic area.
Some aftermarket accessories and performance modifications
Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.

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 U20CA 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 U20CA.

Fortunately, U20CA is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U20CA Trouble Code For Specific Cars

U20CA Chevrolet Impala Dynamic Stability Control Left Front Valve Malfunction
U20CA Mg 14 Air Suspension RR Air Compress Request Exceeded Max Timing
U20CA Chevrolet Copper-cooled Driver Side Airbag Fault
U20CA Puma Gtb Fuel Temperature Sensor #1 Circuit Short to Ground
U20CA Hrg 1100 Ride Control LR Shock Actuator Circuit Short To Ground
U20CA Mitsubishi Space Liner Aux Heater Overheat Sensor Circuit Open
U20CA Nsu Tt Cylinder 12 Misfire Detected