P0849 Diagnostic Trouble Code

P0849 is a kind of OBD-II Diagnostic P-Powertrain 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 P0849 diagnostic trouble code may include:

Possible spark knock (detonation / pre-ignition)
Poor fuel economy
The engine oil will exhibit dilution from the ECUs attempts to increase engine temperature. Some vehicles advance the fuel injection timing slightly after top center to afterburn a small amount of fuel to increase exhaust temperatures. Some of this fuel enters the crankcase. When the ECU determines the necessity to regenerate the DPF, the service life of the oil be shortened significantly
Rich or lean exhaust

Possible Causes :

The Mass Airflow sensor will also cause this problem. Mass Airflow circuit malfunction.
Fuel with a large percentage of sulfur will clog the DPF quickly
Defective ECU strategies or components will prevent proper regeneration

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. It should be pretty close to battery voltage (12 volts). If not, then this is the circuit that has the problem.

Process Tips

Diagnostic trouble code P0849 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 P0849.

Fortunately, P0849 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P0849 Trouble Code For Specific Cars

P0849 Bugatti Type 30 Cylinder 1 Misfire Detected
P0849 Toyota Sera Park/Neutral Switch Circuit Open
P0849 Mercedes Gla Accelerometer Rear Circuit Short To Battery
P0849 Volkswagen Karmann Ghia Right Lamp Outage Signal Circuit Short to Ground
P0849 Bmw Isetta Closed Throttle Position Switch Malfunction
P0849 Italdesign Orbit SCP (J1850) Lack of Acknowledgment for Telltales
P0849 Chevrolet Ss Electrodrive Fan 1 Operational Failure (Driver Side)