U1945 Diagnostic Trouble Code

U1945 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 U1945 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
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected

Possible Causes :

Fuel with a large percentage of sulfur will clog the DPF quickly
The Mass Airflow sensor will also cause this problem. Mass Airflow circuit malfunction.
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. Look at the plug wires to make sure they are not burnt or laying on the exhaust. Once located, visually inspect the connectors and wiring. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors.

Process Tips

Diagnostic trouble code U1945 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 U1945.

Fortunately, U1945 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U1945 Trouble Code For Specific Cars

U1945 Delahaye Coupe Hydraulic Pressure Sensor Circuit Low Input
U1945 Skoda Karoq Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor)
U1945 Vauxhall Insignia Pressure Control Solenoid A Control Circuit Low
U1945 Saab 96 Ignition Tach Circuit Failure
U1945 Volkswagen Aac Rear Sounder Circuit Short to Vbatt
U1945 Subaru Ff-1 Left Front Sensor Circuit Fault
U1945 Citroen C Front Lateral Accelerometer Circuit Failure