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B3949 Engine Trouble Code

Meaning of B3949 engine trouble code is : When the check engine light comes B3949 code on the first you should check is the gas cap. Pull over, retighten it, and take a look at the cap to see if it has any cracks in it. Continue driving and see if the check engine light turns off. Alternately, you can purchase a gas cap for about $3 at an auto parts store. All you need to do is take the old one off and screw on the new one. If you've already made it to the store, you might as well just replace it. While not car-threatening, it's good to take care of this right away to improve gas mileage.

B3949 Possible Solution:

B3949 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.

B3949 Code Meaning :

B 3 9 4 9
OBD-II Diagnostic Body (B) Trouble Code For Engine Ignition System Or Misfire Injector Circuit Malfunction - Cylinders Injection lump Fuel Metering Control 'B' High (Cam/Rotor/Injector) Reverse Input Circuit

The oxygen (02) sensors on your car measure the oxygen in the exhaust to determine how rich or lean the ratio of fuel and air are in the cylinders. Optimizing this mixture means better fuel economy and fewer exhaust emissions.

B3949 OBD-II Diagnostic Body (B) Trouble Code Description

B3949 engine trouble code is about Reverse Input Circuit.

Reason For B3949 Code

The reason of B3949 OBD-II Engine Trouble Code is Injector Circuit Malfunction - Cylinders.

B3949 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.