U3876 Diagnostic Trouble Code

U3876 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 U3876 diagnostic trouble code may include:

Vacuum leak on the engine
Reduction in engine performance, especially at low RPM levels
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.
Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)

Repair Processes :

If all testing has passed so far yet you still have the same code, check your scan tool and see if it can open and close the IMRC valve. 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 U3876 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 U3876.

Fortunately, U3876 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U3876 Trouble Code For Specific Cars

U3876 Toyota Auris NVM Memory Failure
U3876 Tatra Tatraplan Mirror Switch Reference Voltage Positive Common Supply Low Voltage
U3876 Chevrolet Adventure Drive Switch Input Circuit Low
U3876 Hansa 1100 Passenger Solar Radiation Sensor Circuit Open
U3876 Jaguar Concept Seat Driver Forward Circuit Failure
U3876 Nissan 1600 Child Seat Detection Circuit Short To Battery
U3876 Lamborghini Gallardo Lp560 Shift/Timing Solenoid Low