U3896 Diagnostic Trouble Code

U3896 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 U3896 diagnostic trouble code may include:

Faulty PCM
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
Poor acceleration
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

Possible Causes :

A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.
Faulty IMRC actuator/sensor
A large air leak at or near the number one oxygen sensor would also cause a lean mixture.

Repair Processes :

Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors. Pull the connectors apart and carefully look at the terminals (the metal parts) inside the connectors. Find out what kind of system you have and verify that voltage to the fuel level sensor is present at the fuel pump wiring harness.

Process Tips

Diagnostic trouble code U3896 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 U3896.

Fortunately, U3896 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U3896 Trouble Code For Specific Cars

U3896 Allard 2.25-litre Air Bag Crash Sensor #2 Ground Circuit Short To Battery
U3896 Great Wall Florid Passenger Rear Seat Down Switch Circuit Short to Battery
U3896 Wartburg De Luxe
U3896 Briscoe Cloverleaf Cooling Fan 2 Control Circuit Malfunction
U3896 Holden Jd Power Steering Failure
U3896 Lotus Seven Traction Control of Brake Exceeds Time-Out
U3896 Hyundai Accent RPM Input Circuit Failure