Dreaded check engine light + other errors
Thread Starter
Member
Joined: Oct 2016
Posts: 134
Likes: 20
From: Danville, CA
GLS450
Dreaded check engine light + other errors
The "check engine" emoji light is back. In addition
Thankfully my trusted indy mechanic is back from vacation next week but would like to get this sorted out before a road trip to ski resorts. 2017 GLS 450 with 112k miles.
- Intermittent "Blind Spot Assist System Inoperable" message (just today it was working, then stopped with message)
- "malfunction" light on the suspension that has since disappeared and not returned
- Radio/Nav sometimes fails to start but does so when I hit power
Thankfully my trusted indy mechanic is back from vacation next week but would like to get this sorted out before a road trip to ski resorts. 2017 GLS 450 with 112k miles.
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2023 GLE3502W, 2024 GLC3002W, 1967 Pontiac GTO 4 sp (sold...sniff)
Shot in the dark. When my '17 GLS550 went wonky like that, it turned out to be a wheel sensor. Take it to Autozone and they'll read the codes for you.
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Joined: Oct 2017
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2015 SL550, 2017 GLS 550, 2010 G550, 1995 E320 Cabriolet
The "check engine" emoji light is back. In addition
Thankfully my trusted indy mechanic is back from vacation next week but would like to get this sorted out before a road trip to ski resorts. 2017 GLS 450 with 112k miles.
- Intermittent "Blind Spot Assist System Inoperable" message (just today it was working, then stopped with message)
- "malfunction" light on the suspension that has since disappeared and not returned
- Radio/Nav sometimes fails to start but does so when I hit power
Thankfully my trusted indy mechanic is back from vacation next week but would like to get this sorted out before a road trip to ski resorts. 2017 GLS 450 with 112k miles.
My old Range Rover would tell me, on a bi-weekly basis, that there was an issue with the transmission or suspension and to "PULL OVER IMMEDIATELY". Restarting the car cleared up those phantom issues.
Could be a computer problem, though I'd get it checked out just in case.
Thread Starter
Member
Joined: Oct 2016
Posts: 134
Likes: 20
From: Danville, CA
GLS450
So just to update my mechanic found 11 (!!) error codes, but most relate to the battery. Turns out the original main battery (Oct 2016!!) was shot plus water leak into the battery area. Was considering after-market battery but it is hard to top 8 years so we will install another Mercedes battery. He will diagnose the water issue before replacing the battery - we do not live in snow country so hopefully not corrosion but who knows.
Also found the air suspension error message was due to air suspension compressor pressure sensor failing. Not a shock as we recently replaced the rear air springs so they probably caused excessive wear on the compressor.
The final error code is for the boost pressure which we have been watching for a year. I am hoping to postpone the turbo replacement but we will see how that goes. Not sure how long turbos are supposed to last...
Unfortunately Benz does not sell a warranty that covers >100k mileage because I would surely have bought it.
Also found the air suspension error message was due to air suspension compressor pressure sensor failing. Not a shock as we recently replaced the rear air springs so they probably caused excessive wear on the compressor.
The final error code is for the boost pressure which we have been watching for a year. I am hoping to postpone the turbo replacement but we will see how that goes. Not sure how long turbos are supposed to last...
Unfortunately Benz does not sell a warranty that covers >100k mileage because I would surely have bought it.
Last edited by Boraxo; Dec 30, 2024 at 10:23 PM.
