B3604 Diagnostic Trouble Code

B3604 is a kind of OBD-II Diagnostic B-Body 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 B3604 diagnostic trouble code may include:

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

Possible Causes :

Rough running engine due to misfiring plugs. Many engines have misfire codes to indicate the cylinder effected, such as P0307 for number 7.
Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)
An air leak forward of the DPF will change the sensor readings resulting in the code

Repair Processes :

Replace the oxygen sensor that is downstream from the catalytic converter on the side of the engine that does not contain cylinder #1. Also, if a oxygen sensor code stating "heater circuit malfunction" the sensor has most probably failed. 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. Now, clear the codes and test-drive the vehicle to see if the code is reset.

Process Tips

Diagnostic trouble code B3604 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 B3604.

Fortunately, B3604 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B3604 Trouble Code For Specific Cars

B3604 Kia Towner Servo Motor Airintake Right Circuit Failure
B3604 Rover 12 Idle Control System RPM higher Than Expected
B3604 Seat Bolero Injector Circuit Open / Shorted - Cylinder #3
B3604 Fiat Seicento Leakage Fault
B3604 Ford F150 Memory Set Switch Circuit Short To Battery
B3604 Ford Festiva Metering Oil Pump Temperature Sensor Circuit Malfunction
B3604 Lancia Zeta Steering Column Lock Switch Circuit Failure