Engine computer not communicating?

2022 TOYOTA COROLLA
90,000 MILES • AUTOMATIC
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CLARISSA SAUCEDO
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  • 1 POST
My car is actually a Corolla cross and there wasn’t an option for it. It’s throwing several codes like precollision system malfunction but when hooked up to the scanner it reads “lost connection with ECM/PCM” I’ll attach the picture I got. If I could get pointed in the right direction I would really appreciate it
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Aug 27, 2026 at 10:27 AM
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STRAILER
  • ✓Experienced Mechanic
  • 55,132 POSTS
Yep, I can help you fix it, the first thing to do is check the fuses. Please go over this video to help and then we can go from there.

https://www.youtube.com/watch?v=G-xNK79Wa-w&pp=0gcJCRMMAYcqIYzv

If you have a shorted injector or coil it can pop the fuse for the engine computer which will cause this issue.
Aug 27, 2026 at 5:15 PM
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