P0BD4 Diagnostic Trouble Code

P0BD4 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 P0BD4 diagnostic trouble code may include:

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

Possible Causes :

A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
Faulty IMRC actuator relay (if equipped)
An air leak forward of the DPF will change the sensor readings resulting in the code

Repair Processes :

If you find a related TSB, the information will often help in diagnosing the code in question as TSBs are crested from many thousands of repairs. 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 P0BD4 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 P0BD4.

Fortunately, P0BD4 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P0BD4 Trouble Code For Specific Cars

P0BD4 Imperial Le Baron SCP (J1850) Invalid or Missing Data for Experimental #1
P0BD4 Cadillac Xlr Door Ajar Circuit Failure
P0BD4 Reliant Se7 Gate Select Position Circuit Intermittent
P0BD4 Holden Hd Power Door Memory Lock Relay Circuit Open
P0BD4 Subaru Rex License Lamp Circuit Short to Battery
P0BD4 Abarth Ot 1600 A/C Post Heater Sensor #2 Circuit Failure
P0BD4 Ford Street Ka Mirror Passenger Up Circuit Short To Ground