Chrysler 43 Ignition Coil Primary Circuit
How to read it
Code 43 reads as 4 flashes, pause, 3 flashes on the check-engine light. Cycle the ignition key on, off, on, off, then leave it on with the engine off, and count the flashes on the power loss or check-engine light.
New to flash codes? The How to Read Chrysler OBD-I Codes with the Key Cycle walks through the test and what the numbers mean. The general OBD-I guide covers the rest.
What does Chrysler code 43 mean?
Ignition Coil Primary Circuit
Common causes of 43
- Failed ignition coil
- Open or shorted coil primary wiring
- Failed ignition control circuit
- Faulty coil driver in the controller
- On some models an EGR fault sets this same code
How to fix 43
- Check for spark at the plugs to confirm the ignition fault
- Measure the ignition coil primary and secondary resistance
- Inspect the coil primary wiring and connector for opens and shorts
- Test the EGR circuit on models that share this code
- Replace the coil only after wiring tests good
- Clear the code and confirm the engine runs
Sources and review
Review: qualified. Read the source limits below.
- Chrysler OBD-I trouble codes, model and year page
live reference page (troublecodes.net)
Supports: code identity and Chrysler meaning
Fetched directly from the linked model page. Single publisher, so the record is qualified, not verified. Causes and check order are curator-written from the circuit the code names.
- Chrysler OBD-I trouble codes, model and year page
live reference page (troublecodes.net)
Supports: code identity and Chrysler meaning
Fetched directly from the linked model page. Single publisher, so the record is qualified, not verified. Causes and check order are curator-written from the circuit the code names.
Last updated 2026-10-10.
Report a correction for 43. Include your vehicle, the issue and a source if you have one.