B3508 Diagnostic Trouble Code

B3508 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 B3508 diagnostic trouble code may include:

Fuel pressure too low
Rich or lean exhaust
Diminished fuel efficiency
Poor fuel economy

Possible Causes :

The Mass Airflow sensor is a hot wire that senses the volume of air entering the intake manifold. The computer uses this information to control fuel mixture.
Defective ECU strategies or components will prevent proper regeneration
Faulty IMRC actuator/sensor

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. 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.

Process Tips

Diagnostic trouble code B3508 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 B3508.

Fortunately, B3508 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B3508 Trouble Code For Specific Cars

B3508 Opel Kadett Dimmer switch Circuit Short to Gnd
B3508 Wills Sainte Claire W SCP (J1850) Invalid or Missing Data for Odometer
B3508 Saab 95 Ignition Start Circuit Short To Ground
B3508 Kia Shuma Secondary Air Injection System Switching Valve B Circuit Malfunction
B3508 Chrysler Chronos Engine RPM Or Speed Limiter Reached
B3508 Marcos 1600 Trans Torque Reduction Request Signal Malfunction
B3508 Castagna Vittoria Door Ajar Lamp Circuit Short To Battery