B1615 Diagnostic Trouble Code

B1615 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 B1615 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
Rich or lean exhaust

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.
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 B1615 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 B1615.

Fortunately, B1615 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B1615 Trouble Code For Specific Cars

B1615 Caterham 1700 Door Ajar LR Circuit Failure
B1615 Fiat Supermirafiori Left Front Center Sensor Circuit Fault
B1615 Fiat 126 Knock Sensor 1 Circuit low Input (Bank 1 or Single Sensor)
B1615 Skoda 440 Keyless Entry Circuit Open
B1615 Toyota Avanza O2 Sensor Circuit High Voltage (Bank 1 Sensor 2)
B1615 Iveco Vertis Seat Direction Switch Assembly Circuit Short To Battery
B1615 Volvo 850 R SCP (J1850) Invalid or Missing Data for Engine Coolant