P04D0 Diagnostic Trouble Code

P04D0 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 P04D0 diagnostic trouble code may include:

Rich or lean exhaust
Fuel pressure too low
Engine surge
Poor acceleration

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.
Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)

Repair Processes :

Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors. Pull the connectors apart and carefully look at the terminals (the metal parts) inside the 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. 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.

Process Tips

Diagnostic trouble code P04D0 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 P04D0.

Fortunately, P04D0 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P04D0 Trouble Code For Specific Cars

P04D0 Audi 100 Alarm Panic Input Circuit Short To Ground
P04D0 Intermeccanica Indra SCP (J1850) Invalid or Missing Data for Legislated Diagnostics
P04D0 Studebaker Commander Lamp Turn Signal Rear Output Circuit Short To Battery
P04D0 Jensen 541 Seat Driver Recline Forward Circuit Short To Ground
P04D0 Mitsubishi Lancer Autolamp Sensor Input Circuit Short To Ground
P04D0 Honda Nsx Rear Cargo Door Lock Circuit Short to Ground
P04D0 Ascari Fg-t Air Suspension RF Air Spring Solenoid Output Circuit Failure