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 Holden Club Pedal Position Sensor A Circuit Intermittent
P03AC Land Rover Discovery 3 Steering EVO Out-of-Range Fault
P03AC Ferrari 166 Injector Control Pressure Sensor Above / Below Desired
P03AC Subaru Stella Line Pressure Solenoid System
P03AC Subaru G3x Left Power Sliding Door Open/Close Output Circuit Short to Battery
P03AC Marauder 100 TrafficMaster Module Error
P03AC Mercedes E 230 ABS Power Relay Coil Short Circuit To Battery