U0045 Diagnostic Trouble Code

U0045 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 U0045 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
Engine surge

Possible Causes :

Some aftermarket accessories and performance modifications
A faulty oxygen sensor. This will set a code in itself, however, a faulty oxygen sensor does not automatically condemn the sensor. The code just means that the sensor signal was not within specifications. An air leak or any of the above will cause an erroneous signal. There is a multitude of O2 codes relating to O2 performance which gives a clue to the problematic area.
Defective ECU strategies or components will prevent proper regeneration

Repair Processes :

Look at the plug wires to make sure they are not burnt or laying on the exhaust. 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. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors. Pull the connectors apart and carefully look at the terminals (the metal parts) inside the connectors.

Process Tips

Diagnostic trouble code U0045 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 U0045.

Fortunately, U0045 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U0045 Trouble Code For Specific Cars

U0045 Lincoln Premiere Throttle/Pedal Position Sensor/Switch B Circuit High Input
U0045 Chrysler Gs Evaporative Emission Control System Leak Detected
U0045 Oldsmobile Vista Cruiser Damper LR Circuit Open
U0045 Mercedes C 320 ABS Inlet Valve Coil LR Circuit Short To Ground
U0045 Audi A2 Ambient Air Temperature Sensor Circuit Low
U0045 Star 20 Lamp Park Input Circuit Open
U0045 Mazda Levante Turbo Charger Bypass Valve Control Circuit High