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WARNING MESSAGE - Alternator Failure?

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WARNING MESSAGE - Alternator Failure?

 
Old 02-04-2016, 12:00 AM
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Question WARNING MESSAGE - Alternator Failure?

Got an interesting warning message last night on the dashboard of my 2015 C300 (W205): Icon of battery with an exclamation point (!) with the words "Stop Vehicle. Shift to 'P'. Leave Engine Running."

Same message popped up again today within about 5-10 minutes of driving. Couldn't really find anything on Google about the warning message other than a PDF document from a CLA Owners Manual, which said it means an overheating automatic transmission (?).

I pressed the Mbrace Vehicle Information button and the tech on the phone said it was probably an issue with the alternator, not transmission. He suggested I take it immediately to the dealership, which I did -- and of course, they've never seen the message on any of their vehicles before. They prepared me for a long wait while they do research to find someone who has knowledge of the message.

Has anyone had to deal with this message in any way with their C-Class?

- Mark


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Old 02-04-2016, 12:17 AM
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Charging and batt voltage problems are easy to diagnose. Your dealer should take care of this quickly. Most likely cause is probably a bad batt. It happens sometimes.
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Old 02-04-2016, 09:04 AM
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Originally Posted by radiojon View Post
Got an interesting warning message last night on the dashboard of my 2015 C300 (W205): Icon of battery with an exclamation point (!) with the words "Stop Vehicle. Shift to 'P'. Leave Engine Running."

Same message popped up again today within about 5-10 minutes of driving. Couldn't really find anything on Google about the warning message other than a PDF document from a CLA Owners Manual, which said it means an overheating automatic transmission (?).

I pressed the Mbrace Vehicle Information button and the tech on the phone said it was probably an issue with the alternator, not transmission. He suggested I take it immediately to the dealership, which I did -- and of course, they've never seen the message on any of their vehicles before. They prepared me for a long wait while they do research to find someone who has knowledge of the message.

Has anyone had to deal with this message in any way with their C-Class?

- Mark


Tell them that you and the loaner car will wait elsewhere while they learn how to work on their car.
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Old 02-08-2016, 11:24 AM
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Turned out to be a loose battery cable. The warning looked ominous, but the fix was fairly simple. All good.
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Old 02-06-2017, 01:38 PM
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I just got the same warning for the first time on my 2015 c300.
Dealer said to let the engine run to 're-charge' the battery. Then to call MB roadside for support.

Can I easily tighten the battery cables myself?
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Old 02-06-2017, 05:56 PM
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The resting voltage on the battery got too low. Running the engine engages the alternator which restores the battery to full voltage. It can be a sign the battery is getting tired and not holding a charge, or the battery is being discharged by running in Accessory mode too long, or the cables are loose.

Remove the shield on the left side of the engine compartment, lift the air filter out of the way, and check/tighten the terminal connections. If they're already snug and the problem persists replace the battery.
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Old 02-07-2019, 09:14 AM
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Originally Posted by Smoothie View Post
I just got the same warning for the first time on my 2015 c300.
Dealer said to let the engine run to 're-charge' the battery. Then to call MB roadside for support.

Can I easily tighten the battery cables myself?
i had the same message, pls advise what should i do? TIA
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Old 02-07-2019, 05:46 PM
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Originally Posted by Tan Kok Kiong View Post
i had the same message, pls advise what should i do? TIA
If you live in the U.S. and have a AAA membership or roadside assistance, they can test your battery for free.

Last edited by lvbatteryguy; 02-07-2019 at 05:49 PM.
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Old 02-07-2019, 11:03 PM
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I got the same error message sometime last fall and had to get a new battery.
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