P03AC Diagnostic Trouble Code

P03AC 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 P03AC diagnostic trouble code may include:

Fuel pressure too low
Rich or lean exhaust
Diminished fuel efficiency
Malfunction Indicator Lamp (MIL) illuminated

Possible Causes :

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

Repair Processes :

Once located, visually inspect the connectors and wiring. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors. 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.

Process Tips

Diagnostic trouble code P03AC 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 P03AC.

Fortunately, P03AC is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P03AC Trouble Code For Specific Cars

P03AC Chrysler Phaeton Evaporative Vac Solenoid Circuit Malfunction
P03AC Honda Acura Tsx Pressure Control Solenoid C Control Circuit High
P03AC Dodge Royal Ignition Run/Start Circuit Short To Ground
P03AC Suzuki Sj Mirror Driver Memory Position Error
P03AC Jaguar Xk Seat Driver Occupied Switch Circuit Open
P03AC Mbm Coupe Tourism A/C Post Heater Sensor Circuit Short To Ground
P03AC Buick 90 Cylinder 5 Contribution/Balance Fault