The waveform is from a Buick car.
The CAN H & L look like normal. Sorry the picture in my post above, I activated filter on Ch B.
I most interest in why the one part of CAN H excessed 3.5 V (and one part of CAN L less than 1.5V). But while I disconnected the EBCM and VES, the CAN Bus swictched normally as standard(CAN H 2.5-3.5,CAN L 1.5-2.5).