U2340 Diagnostic Trouble Code

U2340 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 U2340 diagnostic trouble code may include:

Engine surge
Blown fuse (if applicable)
Lack of power
Hesitation upon acceleration

Possible Causes :

Some aftermarket accessories and performance modifications
A faulty oxygen sensor. This will set a code in itself, however, a faulty oxygen sensor does not automatically condemn the sensor. The code just means that the sensor signal was not within specifications. An air leak or any of the above will cause an erroneous signal. There is a multitude of O2 codes relating to O2 performance which gives a clue to the problematic area.
Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)

Repair Processes :

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. It should be pretty close to battery voltage (12 volts). If not, then this is the circuit that has the problem.

Process Tips

Diagnostic trouble code U2340 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 U2340.

Fortunately, U2340 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U2340 Trouble Code For Specific Cars

U2340 Volkswagen Eurovan Ride Control LF Shock Actuator Circuit Failure
U2340 Siata Amica Intake Air Temperature Sensor 2 Circuit Low
U2340 Chevrolet Lumina ECU Is Defective
U2340 Nissan Kubistar Code Word Unregestered
U2340 Audi 90 Ambient Air Temperature Sensor Circuit
U2340 Sunbeam Alpine Manifold Absolute Pressure/Barometric Pressure Circuit Range/Performance Problem
U2340 Vauxhall Maxx Pressure Control Solenoid B Control Circuit / Open