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"Does anyone have a flow chart for Gm code 43?" You weren't specific of year! So here are both. 1982 - 1992 Code 43: Electronic Spark Control "Poor electrical connection, open or short in circuit; defective ESC module; defective knock sensor; defective ECM". 2003 - 2005 OBD I Code 43: Knock Sensor(KS)Circuit "Check ECM/PCM for an open or short to ground; if necessary, reroute the harness away from other wires such as spark plugs, etc. Replace the knock sensor if bad". Basically different! But the same!! Right? ESC & KS talk to each other.

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19y ago

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