P1CAC Diagnostic Trouble Code

P1CAC is a kind of OBD-II Diagnostic P-Powertrain 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 P1CAC diagnostic trouble code may include:

Faulty PCM
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
Poor acceleration
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected

Possible Causes :

Fuel with a large percentage of sulfur will clog the DPF quickly
The Mass Airflow sensor will also cause this problem. Mass Airflow circuit malfunction.
A large air leak at or near the number one oxygen sensor would also cause a lean mixture.

Repair Processes :

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. Oxygen sensors signal the engine management computer the amount of oxygen present in the exhaust, which is used in determining and controlling the fuel ratio. Once located, visually inspect the connectors and wiring. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors.

Process Tips

Diagnostic trouble code P1CAC 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 P1CAC.

Fortunately, P1CAC is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P1CAC Trouble Code For Specific Cars

P1CAC Austin-healey Sprite Aux Heater Blower Fan Circuit Open
P1CAC Koenigsegg Cc Servo Motor Potentiometer Coolair Circuit Failure
P1CAC Saab 9.3 Ii Ignition Run/Acc Circuit Open
P1CAC Datsun 1200 Heater Coolant Temp sensor circuit Short to GND
P1CAC Austin 28 Audio Voice Module Not Responding
P1CAC Glas 1304 Overdrive Band Failed Off
P1CAC Plymouth Duster Evaporative Emission Control System Pressure Sensor Range/Performance