U0849 Diagnostic Trouble Code

U0849 is a kind of OBD-II Diagnostic U-Network 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 U0849 diagnostic trouble code may include:

Rich or lean exhaust
Fuel pressure too low
Engine surge
Poor acceleration

Possible Causes :

Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)
Rough running engine due to misfiring plugs. Many engines have misfire codes to indicate the cylinder effected, such as P0307 for number 7.
Faulty IMRC actuator relay (if equipped)

Repair Processes :

Look for missing ground strap or a rusty ground where the fuel tank is grounded to the frame. Check for damage to the wiring harness connector. It should be pretty close to battery voltage (12 volts). If not, then this is the circuit that has the problem. Oxygen sensors signal the engine management computer the amount of oxygen present in the exhaust, which is used in determining and controlling the fuel ratio.

Process Tips

Diagnostic trouble code U0849 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 U0849.

Fortunately, U0849 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U0849 Trouble Code For Specific Cars

U0849 Hillman Hunter Passenger's Seatbelt Tension Reducer Circuit Short to Ground
U0849 Citroen Evasion Fuel level Sensor Circuit Low Input
U0849 Renault Vel Satis HO2S Heater Control Circuit Low (Bank 2 Sensor 2)
U0849 Lola Climax Timing Reference High Resolution Signal B Intermittent/Erratic Pulses
U0849 Isuzu Wizard SCP (J1850) Invalid or Missing Data for Vehicle Speed
U0849 De Soto Diplomat Hood Switch Circuit Open
U0849 Nissan Prairie COURTESY LAMP OUTPUT Ckt Short to Battery