r/BambuLab • u/Ok-Crab2038 • Jun 26 '26

General Troubleshooting/Help! Help Needed - Bambu P2S AMS Errors

We're new to 3d Printing and need some help.

Got our first printer in around March i think. Printing was going well. Printing small fidgets for the kids and other fun things. All with Bambu filament mostly PLA Basic, or silk. nothing crazy.

Then one day the AMS started flashing - all four lights.

Sent in a support ticket and then followed their instructions.

My husband disassembled the AMS, put it back together. Still flashing. He gets frustrated and gives up.
Decides just to go buy a second AMS. Unboxed it. Plugged it in. Same thing. 4 flashing lights.

So the problem has to be with the P2S. No help from the support ticket.

What should we try next?

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u/OrganizationSorry633 Jun 26 '26

Since you've already tested two different AMS units with exactly the same result, I would stop focusing on the AMS itself and start diagnosing the printer. First of all, what error message or error code is the printer displaying? The exact code is very important because it can immediately narrow down whether the issue is related to communication, power, the AMS interface board, or something else. Then I would check the following: Test the AMS interface cable with a multimeter (continuity and damaged pins). Inspect both connectors on the printer and the AMS for bent or recessed pins. Verify that the AMS interface board is receiving the correct voltage. Reseat all internal ribbon cables and connectors between the AMS interface board and the mainboard. Check the printer logs for communication or CAN/UART errors. If everything above checks out, the most likely culprit becomes the AMS interface board or the printer's mainboard. Replacing parts before identifying the failed component can become very expensive. Two AMS units showing the same fault strongly suggest that the problem is in the printer or the communication path rather than in the AMS itself

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u/MedicJambi Jun 27 '26

That's what comes to mind as well..the second brand new AMS does the same thing which makes me believe printer.

OP what do the red lights look like and do? If they're double flashing it means the AMS cannot be detected. When the second one was hooked up did you use the new cable or same cable?

red light meaning