U1506 Diagnostic Trouble Code

U1506 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 U1506 diagnostic trouble code may include:

The engine oil will exhibit dilution from the ECUs attempts to increase engine temperature. Some vehicles advance the fuel injection timing slightly after top center to afterburn a small amount of fuel to increase exhaust temperatures. Some of this fuel enters the crankcase. When the ECU determines the necessity to regenerate the DPF, the service life of the oil be shortened significantly
Faulty or damaged wiring
Hesitation upon acceleration
Rich or lean exhaust

Possible Causes :

Faulty IMRC actuator relay (if equipped)
A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
Defective ECU strategies or components will prevent proper regeneration

Repair Processes :

Now, clear the codes and test-drive the vehicle to see if the code is reset. 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 U1506 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 U1506.

Fortunately, U1506 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U1506 Trouble Code For Specific Cars

U1506 Maserati Kubang Transmission Fluid Pressure Sensor/Switch E Circuit Low
U1506 Acura Slx ABS Inlet Valve Coil LR Circuit Open
U1506 Toyota Gaia Oil Change Reset Button Circuit Failure
U1506 Aston Martin Db9 Air Suspension RR Height Sensor Circuit Open
U1506 Gaz 3111 O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)
U1506 Mercedes-benz 220 Air Bag Passenger Circuit Failure
U1506 Ferrari P4/5 Keep Alive Memory Test Failure