B0843 Diagnostic Trouble Code

B0843 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 B0843 diagnostic trouble code may include:

Misfire
Misfire
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
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
An air leak forward of the DPF will change the sensor readings resulting in the code

Repair Processes :

You might continue by connecting the scanner to the vehicle diagnostic connector and retrieving all stored codes and freeze frame data. Look at the plug wires to make sure they are not burnt or laying on the exhaust. 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.

Process Tips

Diagnostic trouble code B0843 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 B0843.

Fortunately, B0843 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B0843 Trouble Code For Specific Cars

B0843 Toyota Model F Output Circuit Check Signal Low
B0843 Toyota Conquest O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 3)
B0843 Daewoo Mantica Gate Select Position Circuit Low
B0843 Chevrolet Equinox 2 Drivers Seat Belt Buckle Switch Resistance out of Range
B0843 Alfa 24 ABS Outlet Valve Coil Rear Circuit Short To Ground
B0843 Chevrolet Vivant Engine Coolant Temperature Circuit High Input
B0843 Cadillac Bls Data Mismatch #2 (receive data does not match what was expected)