U1923 Diagnostic Trouble Code

U1923 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 U1923 diagnostic trouble code may include:

The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
Faulty PCM
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected
Diminished fuel efficiency

Possible Causes :

The Mass Airflow sensor is a hot wire that senses the volume of air entering the intake manifold. The computer uses this information to control fuel mixture.
Defective ECU strategies or components will prevent proper regeneration
An air leak forward of the DPF will change the sensor readings resulting in the code

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. Pack the connector cavity with dielectric silicone compound (same stuff they use for light bulb sockets and spark plug wires) and reassemble.

Process Tips

Diagnostic trouble code U1923 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 U1923.

Fortunately, U1923 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U1923 Trouble Code For Specific Cars

U1923 Glas 1304 Overdrive Band Failed Off
U1923 Maserati 4200 Transmission Fluid Deteriorated
U1923 Opel P 1200 Door Ajar RR Circuit Open
U1923 Bmw Six Clutch Switch Input Circuit Malfunction
U1923 Mercedes Sl Class Air Bag Crash Sensor #2 Ground Circuit Short To Ground
U1923 Suzuki Vitara Mirror Driver Up Circuit Short To Battery
U1923 Lancia Medusa Split Air #1 Circuit Malfunction