Car acting like battery is low and then dead but it's good

Minton444 · 11-21-2021, 01:21 PM

Went to start my 06 e60 525xi this morning. It's acting like the battery was almost dead. After two tries it stopped turning over as if the battery was dead. I took my battery to the local advance auto store for a test and they said it was a good battery with 811 cold cranking amps out of 900 with something like 12.25 volts. Does anyone know what could cause this issue and how to fix it?

Bimmer_Bro · 11-21-2021, 01:31 PM

Quote:

Originally Posted by Minton444

Went to start my 06 e60 525xi this morning. It's acting like the battery was almost dead. After two tries it stopped turning over as if the battery was dead. I took my battery to the local advance auto store for a test and they said it was a good battery with 811 cold cranking amps out of 900 with something like 12.25 volts. Does anyone know what could cause this issue and how to fix it?

Possible faulty crank position sensor? Just one idea

cruizinmax · 11-22-2021, 08:12 AM

Could be bad ground cable between engine and body. Could also be bad starter. If it's cranking slow like a low/dead battery it's not going to be a sensor.

There is an easy test to diagnose the ground cable between the body and engine block. Connect a jumper cable between a body ground point under the hood and something metal connected to the engine block like the oil filter housing or something. If it cranks normally you've got a bad ground cable.

Minton444 · 11-22-2021, 01:44 PM

Quote:

Originally Posted by cruizinmax

Could be bad ground cable between engine and body. Could also be bad starter. If it's cranking slow like a low/dead battery it's not going to be a sensor.

There is an easy test to diagnose the ground cable between the body and engine block. Connect a jumper cable between a body ground point under the hood and something metal connected to the engine block like the oil filter housing or something. If it cranks normally you've got a bad ground cable.

Thanks, I did that and still nothing so I'm going to replace the starter.

maximum96 · 11-24-2021, 07:29 AM

Mine did same thing, starter was acting up.

Pittz1 · 11-24-2021, 08:23 AM

Starter. 100%. Just went through this. Original starter had 191k on it.

11-21-2021, 01:21 PM	#1
Minton444 Private 10 Rep 81 Posts Drives: 2006 525xi e60 Join Date: Aug 2021 Location: Columbus, Ohio iTrader: (0)	Car acting like battery is low and then dead but it's good Went to start my 06 e60 525xi this morning. It's acting like the battery was almost dead. After two tries it stopped turning over as if the battery was dead. I took my battery to the local advance auto store for a test and they said it was a good battery with 811 cold cranking amps out of 900 with something like 12.25 volts. Does anyone know what could cause this issue and how to fix it?
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11-22-2021, 08:12 AM	#3
cruizinmax Private First Class 33 Rep 111 Posts Drives: 99 Civic, 09 335i Join Date: Apr 2017 Location: Springfield, MO iTrader: (0)	Could be bad ground cable between engine and body. Could also be bad starter. If it's cranking slow like a low/dead battery it's not going to be a sensor. There is an easy test to diagnose the ground cable between the body and engine block. Connect a jumper cable between a body ground point under the hood and something metal connected to the engine block like the oil filter housing or something. If it cranks normally you've got a bad ground cable.
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11-24-2021, 07:29 AM	#5
maximum96 Enlisted Member 5 Rep 44 Posts Drives: 08 e60 Join Date: Apr 2012 Location: queens iTrader: (0)	Mine did same thing, starter was acting up.
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11-24-2021, 08:23 AM	#6
Pittz1 2018 M3 ZCP / 06 330xi 214 Rep 278 Posts Drives: 330xi 2006 / 18 M3 ZCP Join Date: Dec 2018 Location: Maryland iTrader: (0)	Starter. 100%. Just went through this. Original starter had 191k on it.
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