C0443 Diagnostic Trouble Code

C0443 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 C0443 diagnostic trouble code may include:

Faulty O2 Sensor
Lack of power
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.

Possible Causes :

Rough running engine due to misfiring plugs. Many engines have misfire codes to indicate the cylinder effected, such as P0307 for number 7.
Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)
Fuel with a large percentage of sulfur will clog the DPF quickly

Repair Processes :

If the engine displays a miss and there wasn't a code, determine which cylinder is misfiring. If the exhaust manifold is visible, spay or pour a small amount of water on each cylinder exhaust port. Water will evaporate immediately on good cylinders and slowly on the missing cylinder. If this can't be accomplished pull the plugs and check the condition. 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. If all testing has passed so far yet you still have the same code, check your scan tool and see if it can open and close the IMRC valve.

Process Tips

Diagnostic trouble code C0443 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 C0443.

Fortunately, C0443 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C0443 Trouble Code For Specific Cars

C0443 Chevrolet Four Ninety Dual Alternator Battery Lamp Circuit Malfunction
C0443 Daihatsu Sonica Glow Plug Circuit Low Input (Bank #2)
C0443 Marendaz 13 Transmission 4-Wheel Drive Low Indicator Circuit Failure
C0443 Mercury Comet Air Suspension LR Air Spring/Shock Solenoid Output Circuit Failure
C0443 Toyota Starlet Passenger Door Ajar Circuit Short To Ground
C0443 Buick 80 Cylinder 4 Misfire Detected
C0443 Clan Crusader Fuel Rail/System Pressure - Too High