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Electrical problem

Old Feb 7, 2008 | 02:50 AM
  #1  
Robert Schrader's Avatar
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Electrical problem

I'm doing 80+ up I5 late in the evening, and suddenly the car loses engine power. I coast to the side, and the computer is telling me that I have a alternator/battery problem. The engine will turn over, but will not fire. The headlights will not come on. The turn signals, emergency blinkers, and other interior lights do work.

I call AAA and they tell me 25 minutes. So to preserve battery power, I turn off the emergency blinkers and turn on the left turn signal. When I do that the computer readout changes to 'no malfunction'. I start it and it drives normally. Ten miles down the road, the engine loses power for about 5 seconds, then all is normal again.

Any ideas what this could be?

Thanks
RMS
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Old May 7, 2008 | 02:07 PM
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Robert Schrader's Avatar
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Solution

This turned out to be the radio! Aparently it was sending lots of arbitrary messages until it clogged the network and other messages to/from the engine couldn't get through.
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Old May 7, 2008 | 02:12 PM
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Originally Posted by Robert Schrader
This turned out to be the radio! Aparently it was sending lots of arbitrary messages until it clogged the network and other messages to/from the engine couldn't get through.

Thanks for letting us know. Tallk about a weird one.
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Old May 7, 2008 | 02:19 PM
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Weird...
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Old May 7, 2008 | 04:28 PM
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Who the hell decided to design a system where the radio is not isolated from the ECU?!?!?! (I'm assuming we're talking about the CANbus here).

Sounds like a lawsuit waiting to happen if its true.
Did Microsoft maybe help MB with the electronics?
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Old May 7, 2008 | 04:52 PM
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Yea no kidding. There is no reason the headunit should be communicating with anything other than a related accessory device.
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