C0843 Diagnostic Trouble Code

C0843 is a kind of OBD-II Diagnostic C-Chassis 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 C0843 diagnostic trouble code may include:

Fuel pressure too high
Diminished fuel efficiency
Rich or lean exhaust
Engine surge

Possible Causes :

Rusty exhaust systems, cracked exhaust manifolds or damaged or missing gaskets or donuts will cause air leaks.
An air leak forward of the DPF will change the sensor readings resulting in the code
Faulty IMRC actuator relay (if equipped)

Repair Processes :

You might continue by connecting the scanner to the vehicle diagnostic connector and retrieving all stored codes and freeze frame data. 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 C0843 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 C0843.

Fortunately, C0843 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C0843 Trouble Code For Specific Cars

C0843 Abarth 595 5-6 Shift
C0843 Audi A2 Ambient Air Temperature Sensor Circuit Low
C0843 Aster 24 Air Suspension RF Corner Down Timeout
C0843 Abarth 124 Spider 1-4 Upshift (Skip Shift) Solenoid Control Circuit Malfunction
C0843 Railton 20 Fuel Temperature Sensor A Circuit Intermittent
C0843 Holden Eh Persistent Misfire
C0843 Mercedes Sl 60 Air Bag Crash Sensor #2 Ground Circuit Failure