B1640 Diagnostic Trouble Code

B1640 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 B1640 diagnostic trouble code may include:

Reduction in engine performance, especially at low RPM levels
Vacuum leak on the engine
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 :

Fuel with a large percentage of sulfur will clog the DPF quickly
The Mass Airflow sensor will also cause this problem. Mass Airflow circuit malfunction.
Dirty air cleaner element Damaged DPF

Repair Processes :

Look for damage to the tank indicating impact that may have damaged the fuel pump or sender. If the engine displays a miss and there wasn't a code, determine which cylinder is misfiring. If the exhaust manifold is visible, spay or pour a small amount of water on each cylinder exhaust port. Water will evaporate immediately on good cylinders and slowly on the missing cylinder. If this can't be accomplished pull the plugs and check the condition. Pack the connector cavity with dielectric silicone compound (same stuff they use for light bulb sockets and spark plug wires) and reassemble.

Process Tips

Diagnostic trouble code B1640 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 B1640.

Fortunately, B1640 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B1640 Trouble Code For Specific Cars

B1640 Fiat 850 Lamp Dome Input Circuit Short To Ground
B1640 Kia Carnival Seat Recline Forward/Backward Potentiometer Feedback Circuit Open
B1640 Audi Cabriolet Anti Theft System
B1640 Crossley Shelsley Fuel Tank Pressure Sensor Circuit Failure
B1640 Ford Station Mirror Passenger Up Circuit Short To Battery
B1640 Ajs Nine ABS Outlet Valve Coil Rear Circuit Failure
B1640 Mercedes-benz 540 Air Bag Safing Sensor Output Circuit Short To Ground