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IM GETTING A CODE 43 INTERMITATLY ON MY 93 2 DOOR YUKON , SPARK CONTROL CUIRCUIT , ANY SUGESTIONS ?

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If I'm not mistaken, this code is Electronic Spark Control (ESC) Circuit which can mean anything in the system. There is a knock sensor near the starter that can be the problem. I have also seen a new distributor fix this code. The distributor can lose it's ground in the housing OR the shaft magnet gets too weak

Posted on Jun 17, 2009

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Trouble code P0043 means: HO2S Heater Control Circuit Low (Bank 1, Sensor 3)Hex code 43 is for a misfire.

DTC 43 indicates a cylinder misfire, but does not specify which cylinder is misfiring. To pinpoint which cylinder is misfiring, you need a scan tool and get the "P" code, as you can see in the chart below. So it is quite possible you're barking up the wrong tree.
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If you go to an Autozone they will scan the codes for you, if the CEL is currently on, and tell you the DTCs they find. That will get you closer to the problem.
I'm fairly confident that if you do a complete tune-up, spark plugs, spark plug wires, distributor cap and rotor, that the misfire codes will be taken care of. Be sure you read this, Dodge Ram 1500 Running Rough before replacing the spark plug wires, or if you have already replaced them.

Hope this help (remember comment and rated this)..

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Need help with my 99 gmc yukon! replaced map sensor, and idle air control module. getting gas to shaffer valve, getting spark to the spark plugs. yellow fire.


Im guessing the vehicle wont start? If so you shouldnt rule out fuel just because your getting fuel to the shrader valve, these vehicle require a certain amount of fuel pressure to run, im guessing around 60psi, so i would check fuel pressure, if ok keep in mind that these vehicles also had a problem with early failure on the fuel injectors, GM sells a new design injector set up for them.

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