U2304 Diagnostic Trouble Code

U2304 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 U2304 diagnostic trouble code may include:

Rich or lean exhaust
Fuel pressure too low
Engine surge
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.

Possible Causes :

An air leak forward of the DPF will change the sensor readings resulting in the code
Rusty exhaust systems, cracked exhaust manifolds or damaged or missing gaskets or donuts will cause air leaks.
Faulty IMRC actuator relay (if equipped)

Repair Processes :

If the scan tool has that capability, and the scan tool can operate the IMRC valves, then the problem is either resolved and a simple code clearing is all that's left or a new PCM would be called for. With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground.

Process Tips

Diagnostic trouble code U2304 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 U2304.

Fortunately, U2304 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U2304 Trouble Code For Specific Cars

U2304 Morris Ital Brake Pressure Switch Mechanical Failure
U2304 Chevrolet Hhr Dual Alternator Upper Fault
U2304 Austin 1300 Audio Single-Disc CD Player Internal Fault
U2304 Geely Ck O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)
U2304 Mazda Cx-7 Transmission Transfer Case Rear Shaft Speed Sensor Circuit Failure
U2304 Toyota Avanza O2 Sensor Circuit High Voltage (Bank 1 Sensor 2)
U2304 Syrena 100 Mirror Driver/Passenger Switch Circuit Open