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B1939 Engine Trouble Code

Meaning of B1939 engine trouble code is : When your car's 'B1939 Check Engine' light comes on, it's usually accompanied by a sinking feeling in the pit of your stomach. The light could mean a costly problem, like a bad catalytic converter, or it could be something minor, like a loose gas cap. But in many cases, it means at minimum that you'll be visiting the car dealer to locate the malfunction and get the light turned off.

B1939 Possible Solution:

B1939 Engine

Gasoline engines use spark plugs to cause an explosion of fuel within the cylinder. In a properly timed engine, this explosion occurs at the proper moment to send the piston to the bottom of the cylinder and provide power to the drive shaft. If the plug wires are out of sequence, the explosion occurs at the wrong time. The improper timing of the explosion sometimes pushes the cylinder the wrong direction or interferes with the turning of the crank. As a result, the engine stutters or backfires, if it runs at all.

B1939 Code Meaning :

B 1 9 3 9
OBD-II Diagnostic Body (B) Trouble Code For Engine Fuel And Air Metering Injector Circuit Malfunction - Cylinders Injection Pump Fuel Metering Control 'A' High (Cam/Rotor/Injector) Reverse Input Circuit

Is the fuel pump sometimes not priming when you turn the key to ON(II)? Start by measuring the fuel pressure and checking whether you have bright white-bluish spark at all four plugs. The mechanical timing is also something that you should check, as we mentioned above.

B1939 OBD-II Diagnostic Body (B) Trouble Code Description

B1939 engine trouble code is about Reverse Input Circuit.

Reason For B1939 Code

The reason of B1939 OBD-II Engine Trouble Code is Injector Circuit Malfunction - Cylinders.

B1939 code on vehicles with electronically controlled automatic transmissions, the 3-4 shift solenoid is responsible for actuating the hydraulic circuits to activate clutches or bands that change gears inside the automatic transmission.