Battery Voltage and D+ Signal Too Low?
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Junior Member
Joined: Feb 2011
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Battery Voltage and D+ Signal Too Low?
Hello,
I have a 1999 Volvo V70 T5 wagon and the other day the generator warning light went off and on for a minute or two while driving on the highway. Each time the warning light came on the heater would shut off. At one point the speedometer even dropped to 0 for a few seconds. I've driven it about 50+ miles since then without incident but I've also been driving with the heater and radio off just to be safe.
I took the car to a Volvo mechanic and he was unable to detect anything wrong with the alternator other than seeing the following diagnostic codes:
ABS-0074 Battery voltage Signal too low
CDM-000A D+ signal Signal too low
ECM-4308 Leak diagnostic, major leak - Major leak
He wasn't certain what was wrong but suggested that the alternator may need to be replaced. I also took the car to AutoZone and they tested it and said everything checked out fine but that the battery was at 92%.
I don't know if it's the battery, the regulator, the alternator, or something else at this point. Does anyone have any ideas or suggestions? Thanks in advance!
I have a 1999 Volvo V70 T5 wagon and the other day the generator warning light went off and on for a minute or two while driving on the highway. Each time the warning light came on the heater would shut off. At one point the speedometer even dropped to 0 for a few seconds. I've driven it about 50+ miles since then without incident but I've also been driving with the heater and radio off just to be safe.
I took the car to a Volvo mechanic and he was unable to detect anything wrong with the alternator other than seeing the following diagnostic codes:
ABS-0074 Battery voltage Signal too low
CDM-000A D+ signal Signal too low
ECM-4308 Leak diagnostic, major leak - Major leak
He wasn't certain what was wrong but suggested that the alternator may need to be replaced. I also took the car to AutoZone and they tested it and said everything checked out fine but that the battery was at 92%.
I don't know if it's the battery, the regulator, the alternator, or something else at this point. Does anyone have any ideas or suggestions? Thanks in advance!
Senior Member
Joined: Sep 2010
Posts: 481
Likes: 3
From: Lansing, MI
Check the battery cables starting at the battery terminals. Made sure everything is clean and snug. Check the other ends too. A vast number of problems come from loose or dirty connections. Sometimes the problem is between the cable and the terminal that's attached to it.
The classic voltage drop test: http://www.aa1car.com/library/voltage_drop_testing.htm
Ed
The classic voltage drop test: http://www.aa1car.com/library/voltage_drop_testing.htm
Ed
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MarksS60
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Nov 30, 2010 04:52 PM
