U0172 Diagnostic Trouble Code

U0172 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 U0172 diagnostic trouble code may include:

If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected
Corroded or damaged connector
Reduction in engine performance, especially at low RPM levels
Malfunction Indicator Lamp (MIL) illuminated

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.
Dirty air cleaner element Damaged DPF

Repair Processes :

Look for damage to the tank indicating impact that may have damaged the fuel pump or sender. Oxygen sensors signal the engine management computer the amount of oxygen present in the exhaust, which is used in determining and controlling the fuel ratio. Now, clear the codes and test-drive the vehicle to see if the code is reset.

Process Tips

Diagnostic trouble code U0172 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 U0172.

Fortunately, U0172 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U0172 Trouble Code For Specific Cars

U0172 Mercury Grand Marquis Air Suspension LR Corner Up Timeout
U0172 Chevrolet Journey Dynamic Stability Control Right Rear Valve Malfunction
U0172 Renault Laguna Ground ECU Circuit Open
U0172 Subaru Pleo LF PARK LAMP OUTPUT CIRCUIT Short to Battery
U0172 Innocenti 950 SCP (J1850) Invalid or Missing Data for Function Read Fuel System
U0172 Daewoo Matiz Gate Select Position Circuit Range/Performance
U0172 Singer Sm Invalid /fault data received (Non SCP)