P3104 Diagnostic Trouble Code

P3104 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 P3104 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 :

Pack the connector cavity with dielectric silicone compound (same stuff they use for light bulb sockets and spark plug wires) and reassemble. 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 P3104 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 P3104.

Fortunately, P3104 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P3104 Trouble Code For Specific Cars

P3104 Mercedes S 320 Additional Fan Relay Circuit Malfunction
P3104 Daihatsu Yrv Ground ECU Circuit Open
P3104 Moretti 127 Battery Saver Relay Coil Circuit Short To Ground
P3104 Lancia Astura Speed Wheel Sensor LF Coherency Fault
P3104 Holden Sv6 Power Window LR Motor Circuit Short To Battery
P3104 Gmc Sierra Park Brake Switch # 1 Applied Circuit Failure
P3104 Alfa Romeo Sprint Air Bag Crash Sensor #2 Feed/Return Circuit Short To Ground