U0170 Diagnostic Trouble Code

U0170 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 U0170 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 :

If all testing has passed so far yet you still have the same code, check your scan tool and see if it can open and close the IMRC valve. Look for damage to the tank indicating impact that may have damaged the fuel pump or sender.

Process Tips

Diagnostic trouble code U0170 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 U0170.

Fortunately, U0170 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U0170 Trouble Code For Specific Cars

U0170 Hudson Italia Right Front Center Sensor Circuit Fault
U0170 Volkswagen Transporter
U0170 Siata Spring Intake Air Volume Circuit Malfunction
U0170 Pontiac Trans Am Front Crash Sensor Driver Communications Fault
U0170 Maserati 150 Transmission Automatic 4-Wheel Drive Indicator (Lamp) Circuit Failure
U0170 Tornado Tempest Motor # 2 Input Circuit Short to Vbat
U0170 Hotchkiss Gregoire Ride Control LR Shock Actuator Circuit Failure