horstguenther4

Trailblazer Overheating Check Engine Light

I'm having a headache with my 2023 Chevrolet Trailblazer diesel. It's got about 163539 km on it. The check engine light keeps popping on, and the engine's been overheating like crazy. I even found coolant spilled under the car the other day, seems like there's excessive pressure in the cooling system. I suspect a control unit communication error but I'm not sure where to start. Any ideas? I'm thinking it might be a software glitch or a CAN bus issue, but honestly, I'm just guessing. I heard it can be a connectivity issue or even a wiring issue. Any thoughts?

A 2023 Chevrolet Trailblazer diesel is experiencing overheating and a persistent check engine light, with coolant leakage suggesting excessive pressure in the cooling system. The issue is suspected to be related to a control unit communication error, possibly due to a software glitch, CAN bus issue, or connectivity problem. A similar case was resolved by addressing a defective cable connection to the control unit, which was confirmed and fixed at a workshop, resolving the problem.

Did this summary help you solve your problem?

4 comment(s)

I had something similar happen with my Trailblazer. Overheating and the check engine light were on constantly. Have you checked the cable and plug connections to the control unit? That was my problem.

Thanks! Which control unit was it specifically? And what exactly was wrong with the connection – was it loose, corroded, or something else?

I didn't check myself but it was indeed a defective connection. I'd suggest getting it checked at a workshop before you cause any further damage.

Thanks for the advice! I took it to the shop, and you were spot on. Turns out it was a defective cable connection to the control unit, just like you said. They replaced it, and it cost me about 95€. Appreciate the help!

rmh_community_comment_box_header

community_crosslink_scanner_headline

community_crosslink_scanner_intro

community_crosslink_scanner_title

community_crosslink_scanner_price

community_crosslink_rmh_headline

community_crosslink_rmh_intro

community_crosslink_rmh_title

community_crosslink_rmh_subtitle

community_crosslink_rmh_brand

CHEVROLET

community_crosslink_rmh_model

TRAILBLAZER