P0620 - Error Code - Mercedes E220 W212 Saloon
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W212 Mercedes E220 Saloon
P0620 - Error Code - Mercedes E220 W212 Saloon
Hi All,
I am having an issue with my car at present. It is firing the P0620 code intermittently for the past few days. Over the last year I have replaced the alternator and battery as these were the initial points of failure. The car has had 2 alternators before the mechanic realized that it might be something else causing the issue.
I have my own code reader and get the P0620 code only - no other codes. When the fault appears the battery indication light comes on the dashboard and the stereo switches off (I'm assuming to conserve power). If I use my code reader to clear the code the stereo will come back on and everything is fine.
The problem I have is that this code may not appear again for another 2 months but when it does I'm generally on a long run to the airport or a meeting etc and unless I pull in every 20 seconds to reset the code the car just dies completely.
I really need to figure out what else could be causing this error.
I've been told that the PCM / ECM could be the cause but wondered should there be something else I could look at before going down this route.
I've talked with 2 Mercedes specialists and they say that unless the code is being fired constantly to fault find then there isn't much they can do.
All help would be appeciated.
Thanks
I am having an issue with my car at present. It is firing the P0620 code intermittently for the past few days. Over the last year I have replaced the alternator and battery as these were the initial points of failure. The car has had 2 alternators before the mechanic realized that it might be something else causing the issue.
I have my own code reader and get the P0620 code only - no other codes. When the fault appears the battery indication light comes on the dashboard and the stereo switches off (I'm assuming to conserve power). If I use my code reader to clear the code the stereo will come back on and everything is fine.
The problem I have is that this code may not appear again for another 2 months but when it does I'm generally on a long run to the airport or a meeting etc and unless I pull in every 20 seconds to reset the code the car just dies completely.
I really need to figure out what else could be causing this error.
I've been told that the PCM / ECM could be the cause but wondered should there be something else I could look at before going down this route.
I've talked with 2 Mercedes specialists and they say that unless the code is being fired constantly to fault find then there isn't much they can do.
All help would be appeciated.
Thanks
Last edited by ecooney; Jul 28, 2017 at 07:22 PM.
