Hi,
A code 42 is related to the electronic spark timing (EST) system. The code can be the result of a faulty ignition control module, a short to power or ground, or a faulty ECM.
If you look below, I attached the diagnostics related to the code. It will require wire testing to confirm where the problem is coming from. I would like to add that in most cases (not all) the problem is usually a faulty ignition control module.
Here is a link that you may find helpful when testing wiring:
https://www.2carpros.com/articles/how-to-check-wiring
I hope this helps. Let me know if you have other questions.
Take care,
Joe
See pics below.
Images (Click to make bigger)
SPONSORED LINKS
Monday, January 17th, 2022 AT 6:42 PM