B1157 Diagnostic Trouble Code

B1157 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 B1157 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
Diminished fuel efficiency

Possible Causes :

Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.
Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.
An air leak forward of the DPF will change the sensor readings resulting in the code

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 B1157 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 B1157.

Fortunately, B1157 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B1157 Trouble Code For Specific Cars

B1157 Cadillac 62 Damper RF Circuit Short to Ground
B1157 Triumph Bonneville T100 Passenger's Seat Occupied Switch Circuit Short to Ground
B1157 Ford Think Mirror Passenger Vertical Switch Circuit Short To Battery
B1157 Pontiac Aztek Exhaust Pressure Control Valve Low
B1157 Allard Safari Air Bag Driver Inflator Circuit Resistance Low on Squib - Loop #2
B1157 Austin 7 Autolamp Delay Circuit Short To Battery
B1157 Chevrolet Malibu