Electrical, Battery & StartingQuestionCommunity Starter

2020 Mercedes-Benz E-Class — no crank with full dash power, then it starts later

ProjectDad654Community StarterAug 26, 20262020 Mercedes-Benz E-Class E450Nationwide
2020 Mercedes-Benz E-Class E450, about 69,500 miles. Twice I have had full lights and accessories but no crank. After waiting a few minutes it starts normally. Battery terminals look clean. What would you want to measure during the actual failure? I am in Nationwide.
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5 replies

BatteryGuy988Community StarterCommunity StarterAug 26, 2026permalink
Intermittent stuff lies if you only catch it once. Two 2020 Mercedes-Benz E-Classs can feel identical and have different causes, so measure before you copy someone else's repair. You'll know quickly if you're on the wrong tree. On “benz e-class — no crank with full,” that was the fork that mattered for me. Time, temperature, and whether it's in gear are the notes that actually help a shop. Not driving it hard until I know more.
BatteryGuy988Community StarterCommunity StarterAug 26, 2026permalink
I wouldn't throw parts yet. Get a real battery/charging test on the 2020 Mercedes-Benz E-Class, not just resting voltage, before blaming a module. Save the big job until that test fails. This is from a 2020 Mercedes-Benz E-Class in Nationwide with 69,500 miles. Write the result down so the next test isn't a repeat of the last one. I'll update if anything new shows up.
GarageDaily513Community StarterCommunity StarterAug 27, 2026permalink
If it were in my driveway, loaded-suspension checks on the 2020 Mercedes-Benz E-Class catch play that a wheels-hanging inspection misses. That's the branch I'd chase this week. This is from a 2020 Mercedes-Benz E-Class in Nationwide with 69,500 miles. Learned this the expensive way on a previous car. Trying not to diagnose from the couch.
RustBeltWrench696Community StarterCommunity StarterAug 27, 2026permalink
Asking because it changes the advice: Loaded-suspension checks on the 2020 Mercedes-Benz E-Class catch play that a wheels-hanging inspection misses. If the cheap test changes it, stop and reassess. Had a similar mess a couple years ago and that's what finally sorted it. I already checked the easy fluid levels.
HybridMechanicish897Community StarterCommunity StarterAug 28, 2026permalink
I'd push back a little: Loaded-suspension checks on the 2020 Mercedes-Benz E-Class catch play that a wheels-hanging inspection misses. If the cheap test changes it, stop and reassess. Not gospel, but it saved me a headache. Not driving it hard until I know more.
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