Check Engine Light On
Thread Starter
Member
Joined: Sep 2012
Posts: 200
Likes: 10
2024 GLS450, Previously 2020 GLS450, 2017 GLS450, 2014 GL450, 2012 GL450
Check Engine Light On
Hi All—
My GLS currently has 18k miles on it and yesterday got the check engine light. First thing I checked was the gas cap, and surely it was loose and barely on. So tightened it and closed it. However the light has not gone away.
Ive scheduled an appt with Mercedes but the earliest they have is Friday. Trying to figure out what it is and if I can go on a 400 mile round trip.
Im not sure how long it takes for the CEL to reset after the gas cap has been closed. Also my service B is overdue by 1500 miles, but I don’t think that should be related.
My GLS currently has 18k miles on it and yesterday got the check engine light. First thing I checked was the gas cap, and surely it was loose and barely on. So tightened it and closed it. However the light has not gone away.
Ive scheduled an appt with Mercedes but the earliest they have is Friday. Trying to figure out what it is and if I can go on a 400 mile round trip.
Im not sure how long it takes for the CEL to reset after the gas cap has been closed. Also my service B is overdue by 1500 miles, but I don’t think that should be related.
Member
Joined: Oct 2016
Posts: 134
Likes: 20
From: Danville, CA
GLS450
Same problem, it is not the gas cap as we refilled multiple times and tightened it. Originally lgiht was intermittent but now 24/7.
Naturally this occurred a couple of months after the expiration of our 7/100 extended warranty on our 2017 GLS!
Indy mechanic provided the following report from the code reader:
Naturally this occurred a couple of months after the expiration of our 7/100 extended warranty on our 2017 GLS!
Indy mechanic provided the following report from the code reader:
- The position sensor for the intake cam shaft (cylinder bank 1) has a malfunction
- The position sensor for the intake cam shaft (cylinder bank 1) has a short circuit to ground
- The position sensor for the intake cam shaft (cylinder bank 1) deviates from the specified value. The commanded position cannot be reached.
MBWorld Fanatic!
Joined: Jun 2021
Posts: 1,928
Likes: 523
From: New Hampsha
'17 GLS450, '14 GLK250, Grandpa's Roadster
The position sensor for the intake cam shaft (cylinder bank 1) has a malfunction causing it to deviate from the specified value because it is shorted to ground. Find the short to ground of the cam sensor circuit and fix it.
