U0109 Diagnostic Trouble Code

U0109 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 U0109 diagnostic trouble code may include:

Hesitation upon acceleration
Excessive exhaust leak
Rich or lean exhaust
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
Some aftermarket accessories and performance modifications

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. Now, clear the codes and test-drive the vehicle to see if the code is reset.

Process Tips

Diagnostic trouble code U0109 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 U0109.

Fortunately, U0109 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U0109 Trouble Code For Specific Cars

U0109 Volvo S90
U0109 Daihatsu Compagno Gear Shift Lock Solenoid Circuit Range/Performance
U0109 Nissan E20 Clutch Pedal Switch A Circuit Low
U0109 Chevrolet Corvette Driver Side, Side mount Airbag Circuit Short to Vbatt
U0109 Bmw Z8 Column Tilt Feedback Potentiometer Circuit Short to Ground
U0109 Toyota Master Open Power To Ground VCRM
U0109 Chevrolet Suburban Electronic Feedback Signal Not Detected