U029C Diagnostic Trouble Code

U029C 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 U029C diagnostic trouble code may include:

Hesitation upon acceleration
Excessive exhaust leak
Rich or lean exhaust
Engine surge

Possible Causes :

Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)
Rough running engine due to misfiring plugs. Many engines have misfire codes to indicate the cylinder effected, such as P0307 for number 7.
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. 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.

Process Tips

Diagnostic trouble code U029C 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 U029C.

Fortunately, U029C is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U029C Trouble Code For Specific Cars

U029C Mercedes Cla 180 ABS Inlet Valve Coil RR Circuit Short To Battery
U029C Mazda Verisa A/C Evaporator Air Temperature Circuit Range/Performance
U029C Ferrari 3z Intake Air Temperature Sensor 2 Circuit
U029C Nissan Skyline Cruise Control On Signal Malfunction
U029C Sbarro Christelle Injection Control Pressure Out Of Range Low
U029C Lancia Medusa Split Air #1 Circuit Malfunction
U029C Borgward Isabella Control Sleeve Sensor Malfunction