Battery display message won't go out
Thread Starter
Newbie
Joined: Feb 2019
Posts: 4
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E550
Battery display message won't go out
Battery display message won't go out. When I turn on the car it comes on and stays on. Alternator is charging just fine. Just installed a brand new battery today. No idea what's wrong. Manual states it could be a malfunctioning electronic system. Please help. Thanks.
MBWorld Fanatic!
Joined: Feb 2014
Posts: 6,190
Likes: 1,550
From: MA
2008 E350 4Matic, 2011 E350 4matic
What's the actual voltage of the alternator? Switch to the temperature display with the car off and hit the reset button 3 times. Should display voltage. Should be around 14 volts when driving around. Either the battery you got wasn't fully charged or you have a bad alternator. The voltage regulator could also be bad, but that's part of the alternator. Normally you can just take the car to an auto parts place and they'll do a free charging system test which will test the battery and alternator.
Thread Starter
Newbie
Joined: Feb 2019
Posts: 4
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E550
Thanks guys. Turned out that my rear SAM module was bad. But I still have a persistent issue which has been hard to diagnose, please help. My car doesn't always start especially after I drive it for a while and turn it off. Have to wait for car to cool down prior to it starting again. I have changed the following;
Battery
Fuel Pump
Crank Sensor
ECT sensor
Rear SAM
CAM sensor magnets ( had issues with misfires)
Spark Plugs
Still issue persists. Any ideas. " No computer codes"
2008 E550
Battery
Fuel Pump
Crank Sensor
ECT sensor
Rear SAM
CAM sensor magnets ( had issues with misfires)
Spark Plugs
Still issue persists. Any ideas. " No computer codes"
2008 E550
Last edited by dwightad; Mar 14, 2019 at 11:59 PM.
MBWorld Fanatic!
Joined: Oct 2014
Posts: 1,053
Likes: 347
2011 E-350 4Matic Sport
Don't take this wrong but has anyone looked at live scan data during no start issue? I lean towards a fuel delivery problem but just an internet guess. Is the engine cranking but not starting? I'd be interested to see what the fuel pressure looks like with key on engine off at that time. I would also check all injector pulse width and verify operation. One or more bad injectors can cause the hot no start trouble. I believe there's a fuel pressure controller/regulator in the system but I'd look at scan data before buying more parts. Spray cleaning the MAF sensor using correct type cleaner couldn't hurt either.
Last edited by Mud; Mar 15, 2019 at 10:24 AM.
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Out Of Control!!
Joined: Apr 2019
Posts: 11,923
Likes: 6,776
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
any closure?
Thanks guys. Turned out that my rear SAM module was bad. But I still have a persistent issue which has been hard to diagnose, please help. My car doesn't always start especially after I drive it for a while and turn it off. Have to wait for car to cool down prior to it starting again. I have changed the following;
Battery
Fuel Pump
Crank Sensor
ECT sensor
Rear SAM
CAM sensor magnets ( had issues with misfires)
Spark Plugs
Still issue persists. Any ideas. " No computer codes"
2008 E550
Battery
Fuel Pump
Crank Sensor
ECT sensor
Rear SAM
CAM sensor magnets ( had issues with misfires)
Spark Plugs
Still issue persists. Any ideas. " No computer codes"
2008 E550
"No computer code"... from what scanner: OBD2-basic or an extended bus?
Crank shaft sensor was a excellent guess
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MBWorld Fanatic!
Joined: Oct 2010
Posts: 5,141
Likes: 1,293
From: Southern US
2010 E550, 273 Engine: 2012 S550, 278 Engine
Thanks guys. Turned out that my rear SAM module was bad. But I still have a persistent issue which has been hard to diagnose, please help. My car doesn't always start especially after I drive it for a while and turn it off. Have to wait for car to cool down prior to it starting again. I have changed the following;
Battery
Fuel Pump
Crank Sensor
ECT sensor
Rear SAM
CAM sensor magnets ( had issues with misfires)
Spark Plugs
Still issue persists. Any ideas. " No computer codes"
2008 E550
Battery
Fuel Pump
Crank Sensor
ECT sensor
Rear SAM
CAM sensor magnets ( had issues with misfires)
Spark Plugs
Still issue persists. Any ideas. " No computer codes"
2008 E550
I just replaced my starter. I had a couple long cranks and all cranks were longer than normal. Big improvement with starting with the new starter.
Last edited by Arrie; May 14, 2019 at 09:57 PM.
Out Of Control!!
Joined: Apr 2019
Posts: 11,923
Likes: 6,776
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
Take No2: No restart... Main batt low??
I overlooked an important clue at first reading: "My car doesn't always start especially after I drive it for a while and turn it off."
Have you looked or measured you actual main battery voltage right before that happens?
Use the "Worskshop menu" aka. "Secret Menu" to confirm your battery was indeed getting charged above 12.6V before you stopped the engine.
You may find that after driving your car daytime (no headlights) for a while at highway speed, the engine computer commands your alternator to DRAIN your battery below 11.x Volts under high Amps...
Please share your findings, Txs.
Have you looked or measured you actual main battery voltage right before that happens?
Use the "Worskshop menu" aka. "Secret Menu" to confirm your battery was indeed getting charged above 12.6V before you stopped the engine.
You may find that after driving your car daytime (no headlights) for a while at highway speed, the engine computer commands your alternator to DRAIN your battery below 11.x Volts under high Amps...
Please share your findings, Txs.
If it was me... I would take a long look at TSB's related to your model... "Heat soak" is a known failure mode for some of these vehicles (Main ECU Fuel Injection etc is under the hood and TCU is inside the trainy).
"No computer code"... from what scanner: OBD2-basic or an extended bus?
Crank shaft sensor was a excellent guess
"No computer code"... from what scanner: OBD2-basic or an extended bus?
Crank shaft sensor was a excellent guess
