B3543 Diagnostic Trouble Code

B3543 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 B3543 diagnostic trouble code may include:

Diminished fuel efficiency
Fuel pressure too high
Malfunction Indicator Lamp (MIL) illuminated
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.
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. You might continue by connecting the scanner to the vehicle diagnostic connector and retrieving all stored codes and freeze frame data.

Process Tips

Diagnostic trouble code B3543 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 B3543.

Fortunately, B3543 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B3543 Trouble Code For Specific Cars

B3543 Dodge M Ignition Key-In Circuit Open
B3543 Amc Concorde Air Suspension Front Height Sensor High (SE) Signal Circuit Short To Battery
B3543 Bentley 3.5-litre Battery Heater Circuit Failure
B3543 Volkswagen 1302 Rear Cargo Door Reset Switch Stuck (Short to Ground)
B3543 Rolls-royce Touring Idle Air Control Underspeed Error
B3543 Opel Crossland X Digital TRS Failed to Transition States in KOEO / KOER
B3543 Lexus Flv TCM Power Input Signal Low