Chrysler Fault Code 43: Ignition coil driver circuit open or shorted

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.

Sensors, Switches, and Other Systems | Main Repairs Page | EEKs

Disclaimer: The information provided in this and linked pages are intended for informational use and are provided as accurate to the best of our knowledge.  Neither the author nor Allpar.com is to be held responsible for their contents or the use of the information by you the reader. THE INFORMATION IS OFFERED “AS IS” FOR INFORMATIONAL PURPOSES AND WITHOUT WARRANTIES OF ANY KIND EITHER EXPRESSED OR IMPLIED. IF YOU USE THIS INFORMATION YOU RELEASE THE AUTHOR AND ALLPAR.COM FROM ANY LIABILITY WHATSOEVER.