code 42
Thread Starter
Teching In
Joined: Feb 2006
Posts: 43
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From: stayton,oregon
code 42 i had a map senser that came unplugged and got a check engine light so i took a friends snapon scaner and cleared it. After that the light come back for code 42. Now the scaner said that it was opti-spark circuit break or somthing like that. my question is, what is code 42 really and how do i fix or test for it? Is it possible to test?I cleaned the computer after i got code 42 and it hasnt came on agin.But the car misses really bad at highway speed and under wide open throttle? The opti is like 6 mouths old, and i use delteq ing. system. Im thinking its my opti spark 
. but im going to check plugs, wires and connectors to niight.
. but im going to check plugs, wires and connectors to niight. 
If the MAP worked its way loose, check and see if the opti harness may have came loose too. I was getting a lo res failure (DTC 43 I think) and my miss wasn't even that bad. I too have a Delteq and if the MAP worked its way off, check the coils too. I had a bad miss once and my coils weren't bolted down well enough and they were losing contact with the terminals.
Originally Posted by infinitebird
code 42 is ignition control circuit shorted.
That's usually the coil/icm or a bad ground/short between the pcm and coil/icm.
That's usually the coil/icm or a bad ground/short between the pcm and coil/icm.
