B3709 Diagnostic Trouble Code

B3709 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 B3709 diagnostic trouble code may include:

Vacuum leak on the engine
Reduction in engine performance, especially at low RPM levels
Engine surge
Hesitation upon acceleration

Possible Causes :

A plugged converter will cause of host of driveability problems as well as set this code. A severely plugged converter will result in the inability to increase rpm when under load. Look for a code such as P0421 -- catalytic converter efficiency below threshold if the converter indicating a faulty converter.
Dirty air cleaner element Damaged DPF
Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)

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. Look for damage to the tank indicating impact that may have damaged the fuel pump or sender.

Process Tips

Diagnostic trouble code B3709 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 B3709.

Fortunately, B3709 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B3709 Trouble Code For Specific Cars

B3709 Talbot Lago Mirror Passenger Horizontal Switch Circuit Short To Battery
B3709 Fiat Fiorino Lamp Seat Belt Circuit Short To Ground
B3709 Steyr Haflinger Lamp Tail Output Circuit Short To Ground
B3709 Plymouth Volare Exhaust Gas Recirculation Sensor A Circuit High
B3709 Honda Mobilio Purge flow Sensor Circuit Range/Performance
B3709 Bugatti Type 43 Cylinder 11 Contribution/balance Fault
B3709 Saab 9-7x Ignition Tach Circuit Short To Battery