GL550, no crank, no start AFTER it starts initially
code reader show in live view that it's charging 13.6-14.8. While it's running. Temp outside was 20 degrees. Ran 2 hours sitting. Shut off, no start. Unhook both batteries wait 30 min hook up and car starts fine and several times throughout the day. Next morning cold outside it begins again. Initial start then all dash lights come on but no restart.
Any ideas ?
All of the starter electronics are at the front of the car and under the hood. I don't see water intrusion in the rear causing starter issues unless it's causing a major short (unlikely given that it starts just fine 30 minutes later).
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unhooked both batteries wait 10 min rebook both. Starts and drives fine for the rest of the day. 🤔
Agrivating.
Bye the bye, one way to know that you have a failing starter is that one will not be able to initiate the engine compression check in Xentry/MbStar, as it uses the electrical load measured by the starter as it compresses each cylinder to calculate the compression in each.
Have you had any under body damage or anything of the sort that might have nicked the wiring harness somewhere?
Last edited by Max Blast; Jan 19, 2022 at 02:15 PM.
I just checked the underside of the car nothing seems out of order no scrapes dents holes. It's been checked for moisture in the spare tire compartment.
Have you tried putting the car in maintenance mode to read the battery voltage when cold, and when starting?
That'll tell you what voltages are present in the system when dormant, cranking and running.
Anything less than 12.2 at rest is suspect, below 10.9 it won't crank. If it does crank, what it dips to will tell you the health of the battery.
You did state charging voltage is around 14 volts which is good, but that just tells you your alternator is fine. It says little about the battery's health.
code reader show in live view that it's charging 13.6-14.8. While it's running. Temp outside was 20 degrees. Ran 2 hours sitting. Shut off, no start. Unhook both batteries wait 30 min hook up and car starts fine and several times throughout the day. Next morning cold outside it begins again. Initial start then all dash lights come on but no restart.
Any ideas ?
On another note, if i leave my batter connected after an episode, it will drain the batter whatever is happening keeps something on such that it drains the battery. Have yo you experienced this? I feel as if our cars came with some sort of expiration date in the ecu..so frustrating. Hope we can help each other. I have babied my car its whole life only to have something like this happen, would hate to scrap it.
On another note, if i leave my batter connected after an episode, it will drain the batter whatever is happening keeps something on such that it drains the battery. Have yo you experienced this? I feel as if our cars came with some sort of expiration date in the ecu..so frustrating. Hope we can help each other. I have babied my car its whole life only to have something like this happen, would hate to scrap it.
if you have keyless go, just touching a door is a wake up event. If not, opening a door is a wake up event. If a door or keyless go sensor is reading an input to wake up, this will keep all the systems alive and drain the battery. So start reading out door and tailgate sensors. Pull the tailgate breaker and see if the problem persists.
if not; there’s your problem.









