B1846 Diagnostic Trouble Code

B1846 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 B1846 diagnostic trouble code may include:

Diminished fuel efficiency
Fuel pressure too high
Malfunction Indicator Lamp (MIL) illuminated
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.

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.
Faulty IMRC actuator/sensor

Repair Processes :

Find out what kind of system you have and verify that voltage to the fuel level sensor is present at the fuel pump wiring harness. 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 B1846 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 B1846.

Fortunately, B1846 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B1846 Trouble Code For Specific Cars

B1846 Innocenti Mille SCP (J1850) Invalid or Missing Data for Interior Lamp Outage
B1846 Austin A95 Autolamp On Circuit Short To Battery
B1846 Tesla Roadster Misfire Rate Catalyst Damage Fault - Bank 2
B1846 Apperson Special Air Suspension LR Air Spring/Shock Solenoid Output Circuit Failure
B1846 Durkopp 20 Hp Immobilizer ID Does Not Match
B1846 Suzuki Covie Memory Set Switch Circuit Open
B1846 Volkswagen Touareg SCP (J1850) Invalid or Missing Data for Antenna