U0280 Diagnostic Trouble Code

U0280 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 U0280 diagnostic trouble code may include:

Fuel pressure too low
Rich or lean exhaust
Diminished fuel efficiency
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected

Possible Causes :

A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
Faulty IMRC actuator relay (if equipped)
Faulty IMRC actuator/sensor

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 missing ground strap or a rusty ground where the fuel tank is grounded to the frame. Check for damage to the wiring harness connector. Look at the plug wires to make sure they are not burnt or laying on the exhaust.

Process Tips

Diagnostic trouble code U0280 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 U0280.

Fortunately, U0280 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U0280 Trouble Code For Specific Cars

U0280 Skoda 1201 Key Line Voltage
U0280 Isuzu Hombre SCP (J1850) Invalid or Missing Data for Time / Date
U0280 Kia Sorento Secondary Air Injection System Switching Valve B Circuit Open
U0280 Alfa Romeo 1900 ABS Power Relay Output Short Circuit To Battery
U0280 Plymouth Prowler Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction
U0280 Aston Martin Db5 Air Suspension RR Air Spring/Shock Solenoid Output Circuit Short To Ground
U0280 Aston Martin Dbs Air Suspension RR Height Sensor Circuit Short To Ground