U1703 Diagnostic Trouble Code

U1703 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 U1703 diagnostic trouble code may include:

Corroded or damaged connector
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected
Lack of power
Engine surge

Possible Causes :

Rusty exhaust systems, cracked exhaust manifolds or damaged or missing gaskets or donuts will cause air leaks.
An air leak forward of the DPF will change the sensor readings resulting in the code
Rough running engine due to misfiring plugs. Many engines have misfire codes to indicate the cylinder effected, such as P0307 for number 7.

Repair Processes :

Replace the oxygen sensor that is downstream from the catalytic converter on the side of the engine that does not contain cylinder #1. Also, if a oxygen sensor code stating "heater circuit malfunction" the sensor has most probably failed. You might continue by connecting the scanner to the vehicle diagnostic connector and retrieving all stored codes and freeze frame data. Look for damage to the tank indicating impact that may have damaged the fuel pump or sender.

Process Tips

Diagnostic trouble code U1703 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 U1703.

Fortunately, U1703 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U1703 Trouble Code For Specific Cars

U1703 Aston Martin Sports Air Suspension Vent Solenoid Output Circuit Short To Battery
U1703 Triumph 2000 Passengers Seat Belt Buckle Switch Circuit Short to Battery
U1703 Saab 9-3 Ignition Start Circuit Short To Battery
U1703 Alma Six Air Bag Memory Clear Circuit Open
U1703 Ascari Kz1 Air Suspension RF Air Spring Solenoid Output Circuit Open
U1703 Ktm Super Adventure S Servo Motor Potentiometer Defrost Circuit Short To Ground
U1703 Kia Opirus Seatbelt Driver Pretensioner Circuit Short to Ground