This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.
So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.
The new GM 2021 trailer lighting module and/or system is defective. It fails a pre-connection test with tester, gives "check trailer wiring" warning on dash without a trailer connected and turns off any trailer lighting connected without warning on the road, without blowing a fuse. This problem is much like the tsb report #20-na-198 for earlier models. This issue was addressed by the dealer by replacing the module, but the problem has re-occurred while on the road causing a road safety issue (no trailer lighting), some times without warning. The dealer doesn't know what else to do at this point.
- Titus, AL, USA
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- Titus, AL, USA