U024B Diagnostic Trouble Code

U024B 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 U024B diagnostic trouble code may include:

Rich or lean exhaust
Fuel pressure too low
Engine surge
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 :

Use the DVOM to test resistance and continuity on all system circuits if actuator and sensor resistance levels are in compliance with manufacturer's specifications. 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.

Process Tips

Diagnostic trouble code U024B 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 U024B.

Fortunately, U024B is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U024B Trouble Code For Specific Cars

U024B Morgan 42 F4 Booster Solenoid circuit Failure
U024B Toyota Aristo NVM Alarm Data Failure
U024B Crossley 20 Fuel System Leak Detected Large Leak
U024B Vauxhall Signum Pressure Control Solenoid C Control Circuit High
U024B Fiat 507 Lamp Backup Switch Input Circuit Open
U024B Mercedes-benz Ml Class Air Suspension Front Compressor Relay Circuit Short To Ground
U024B Toyota Es O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 3)