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Intermittent service engine soon code 42 engine does run
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Plooker
User
Sep 28, 2022, 4:53 PM
Post #1 of 2
(2336 views)
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Intermittent service engine soon code 42 engine does run
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Hi, I have a 1994 Chevy K1500 5.7L TBI A/T. Every time it is started now the service engine soon light comes on code 42. Sometimes the engine seems to faulter some when first started and then stalls. Engine generally restarts fine when restarted, although seems to be a little rough and the warning light stays on steady. After engine is fully warmed up and shut off, then restarted, the engine seems to run smoother and the light will stay off until started the next day. I'm mostly concerned that the engine will stall while driving, or stopped at an intersection, which would kinda suck. Thank you for your time. Tom
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Hammer Time
Ultimate Carjunky
/ Moderator

Sep 28, 2022, 6:22 PM
Post #2 of 2
(2333 views)
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Re: Intermittent service engine soon code 42 engine does run
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DTC 42 - ECM has seen an open or grounded IC or bypass circuit. These codes are not very specific like OBD2 codes. It indicates a problem in the ignition control circuit between the distributor and the ECM. Could be wiring, could be the ignition control module. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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