U0033 Diagnostic Trouble Code

U0033 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 U0033 diagnostic trouble code may include:

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
Faulty or damaged wiring
Hesitation upon acceleration
Rich or lean exhaust

Possible Causes :

Faulty IMRC actuator relay (if equipped)
A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
Defective ECU strategies or components will prevent proper regeneration

Repair Processes :

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

Process Tips

Diagnostic trouble code U0033 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 U0033.

Fortunately, U0033 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U0033 Trouble Code For Specific Cars

U0033 Chevrolet Orlando EGRCHK Solenoid Circuit Malfunction
U0033 Franklin Series 17 No Communication to VICS Module (No Fitting of VICS)
U0033 Nissan 270 Chime Input Request Circuit Short To Ground
U0033 Mercedes-benz Bionic Air Conditioner Refrigerant Charge Loss
U0033 Jeep Icon Seat Driver Rear Up/Down Motor Stalled
U0033 Nissan E20 Clutch Pedal Switch A Circuit Low
U0033 Toyota Master Open Power To Ground VCRM