B0755 Diagnostic Trouble Code

B0755 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 B0755 diagnostic trouble code may include:

Fuel pressure too low
Rich or lean exhaust
Diminished fuel efficiency
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)
Faulty IMRC actuator/sensor

Repair Processes :

If the scan tool has that capability, and the scan tool can operate the IMRC valves, then the problem is either resolved and a simple code clearing is all that's left or a new PCM would be called for. 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. Look at the plug wires to make sure they are not burnt or laying on the exhaust.

Process Tips

Diagnostic trouble code B0755 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 B0755.

Fortunately, B0755 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B0755 Trouble Code For Specific Cars

B0755 Maserati 2.24v Transmission Automatic Hall Effect Sensor Power Circuit Failure
B0755 Porsche 944 Fuel Level Sensor B Circuit Low
B0755 Pag Nick Driver Memory Power Switch Indicator Circuit Short to Battery
B0755 Alfa Romeo Alfetta Accelerometer Sensor Circuit Failure
B0755 Ambassador Custom Air Suspension Front Compressor Relay Circuit Short To Ground
B0755 Ford Transit 4 Mirror Switch Reference Voltage Positive Common Supply Voltage Fault
B0755 Riley Elf Horn Relay Coil Circuit Short to Vbatt