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by Bob O’Neill and Bob Lincoln
Code 43 indicates that the ignition coil driver circuit is open or shorted; it will not light the power-limited light or cause limp mode. Possible reasons include:
Poor wiring or connection - Read the page ‘How to troubleshoot drivability issues’. Check the wiring and connections from the logic module to the power module. Clean and re-grease the connectors with dielectric grease.
Defective ignition coil driver transistor - Replace the power module (or SMEC).
Ignition coil failure – The coil’s primary is measured across the two studs on the top of the coil. A measurement of zero ohms means the primary coil is not open. Measurements of a very high ohm reading would indicate a defective coil.
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