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U3964 Engine Trouble Code

Meaning of U3964 engine trouble code is a kind of network trouble code and when the check engine light comes U3964 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.

U3964 Fault Symptoms :

Check engine light comes on
Engine stalling or misfiring
Engine performance issues
Car not starting

If one of these reasons for U3964 code is occuring now you should check U3964 repair processes.
Now don't ask yourself; What should you do with U3964 code ?
The solution is here :

U3964 Possible Solution:

Disconnected, dirty or fouled spark plugs are common causes for engines that won't start. Spark plugs typically need to be replaced every season or 25 hours of use. You should also check that the spark plug gap is set properly. If your spark plugs look good, problems with your ignition system can also preventing a spark. These can range from a faulty spark plug lead, shorted kill switch or flywheel key damage.

U3964 Code Meaning :

U	3	9	6	4
OBD-II Diagnostic Network (U) Trouble Code For Engine	Ignition System Or Misfire	Injector Circuit Malfunction - Cylinders	Cylinder 4 Contribution/Balance Fault	Timing Reference High Resolution Signal A Too Many Pulses

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.

U3964 OBD-II Diagnostic Network (U) Trouble Code Description

U3964 engine trouble code is about Timing Reference High Resolution Signal A Too Many Pulses.

Main reason For U3964 Code

The reason of U3964 OBD-II Engine Trouble Code is Injector Circuit Malfunction - Cylinders.

U3964 DTCs may also be triggered by faults earlier down the line. For example, a dirty MAF sensor might be causing the car to overcompensate in its fuel-trim adjustments. As a result, oxygen sensors are likely to report fuel mixture problems.

	Example: 0140