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Old 10-18-2020, 02:02 AM   #1
meSSohappy

 
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Drives: 2018 ZL1 A10
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18 ZL1 running like crap...comm codes

18 ZL1 is running like crap! Last week I got hit by a commercial mudflap that fell off a truck. Bounced on Hwy and fluttered on my grill/hood before sliding under car. Broke the belly Pam under engine bay and other cosmetic damage. Drove it home and felt fine.
2 days ago, drove about 30 kms and CEL started flashing, noticed engine stuttering. I had a 300 code, random misfire. Found a loose exhaust clamp behind my 2” header collector. Today, I Have communications codes 100 ECM/PCM,101 TCM, 121 ABS, 140 BCM but no misfire codes. Car starts good, drives fine if I don’t accelerate hard! Feels like tranny is acting funny and can hear engine stumbling. Happens in D or when paddle shifting.

Put car on lift and can’t see any broken wires or obvious damage from mudflap, other than broken belly pan.

Looking for a wiring diagram showing all ground connections.

.
Amy other Ideas?

TIA
.
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Old 10-19-2020, 09:11 AM   #2
Juiced1
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I would take the front bumper off and start looking through it. Has to be something that got damaged. A small short can go a long way to screw things up. The tcm is also behind the bumper. I would follow the wires from the ecm to the tcm very closely.
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Old 10-19-2020, 10:54 AM   #3
avalonandl

 
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I would take it to a dealership/repair shop where they can hook it up. I bet some connections got damaged/stressed and is causing these issues.
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Old 10-19-2020, 01:35 PM   #4
SJFGTO
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Agreed with all of the above. The electronics on this car are pretty reliable so I suspect something got loose or a connector broke. That can be a frustrating process to self diagnose. I’d take it to a dealership.
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