What is your question?
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What is your question?
Monday I was driving and my car started to not want to accelerate. I pulled over and it stated that the battery was bad. So when I go home (in the mountains) I changed it out with the new battery in my 2003 BMW 525I to see if this would correct the problem. The check engine and battery lights both went off and the car drove fine. Until Yesterday morning that is. I was driving and an error code of P0563 High Voltage, popped up and my car started to not want to accelerate and at one point went into limp mode. I unhooked the battery and the car shut off. That tells me that it is the alternator? BUt I just replaced the alternator 4 months ago. Is there any way that by using the battery from my BMW the voltage is out of range causing the car to act up? Or is it the alternator? Please help me!!
2 Replies
By disconnecting the battery , while running , you may have caused a voltage 'spike' that damaged the PCM , or other electrical components , leading to the current condition.
When a battery runs down in a Mercedes, it writes an error code to the computer and causes problems with shifting and idling etc.. You have to put a new battery in and have ALL of the error codes erased from the computer. Simply removing the negative cable from your battery terminal will not be enough. It usually requires a technician to remove ALL of the error codes. This is a widely publicized problem with Mercedes C-Class vehicles. People have replaced entire transmissions only to find out that $6,000 dollars later, nothing changed and were screwed by a shop..Try this first! If this isn't the issue, then have the transmission Control Module inspected. There is an electrical terminal nearby that sometimes leaks transmission fluid on the module and causes shorts on its circuit board. The very LAST resort is to change the transmission. These gear-boxes are built to last hundreds of thousands of miles. The problem is usually electrical!........