U1757 Diagnostic Trouble Code

U1757 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 U1757 diagnostic trouble code may include:

Poor fuel economy
Possible spark knock (detonation / pre-ignition)
Misfire
Rich or lean exhaust

Possible Causes :

The Mass Airflow sensor will also cause this problem. Mass Airflow circuit malfunction.
Fuel with a large percentage of sulfur will clog the DPF quickly
A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.

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. If the scan tool has that capability, and the scan tool can operate the IMRC valves, then the problem is either resolved and a simple code clearing is all that's left or a new PCM would be called for.

Process Tips

Diagnostic trouble code U1757 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 U1757.

Fortunately, U1757 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U1757 Trouble Code For Specific Cars

U1757 Chevrolet Agila Driver Brake Apply Circuit Fault
U1757 Ds Ds 4 Ignition/Distributor Engine Speed Input Circuit Intermittent
U1757 Maxwell Model H Transmission Range Sensor Circuit malfunction (PRNDL Input)
U1757 Toyota Porte Park / Neutral Switch Input Circuit
U1757 Kia Spectra Sensor Power Supply Low Input
U1757 Renault Grand Scenic Glow Plug Circuit Low Input (Bank #1)
U1757 Fiat Croma 2 Lamp Keypad Output Short Circuit To Battery