TSX 6MT Pick-up/Speed sensor interference within transmission - Acura TSX Forum
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post #1 of 1 (permalink) Old 04-19-2017, 12:54 PM Thread Starter
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TSX 6MT Pick-up/Speed sensor interference within transmission

I'm totally stumped and don't know what to do. I'm the original owner of my 2005 TSX. I just replaced my clutch... what a PITA! This was just a straight forward clutch replacement... the transmission was never cracked open and the pick-up / speed sensor was never removed. I get everything back together, take for a drive and the speedometer doesn't work. A couple of miles into the drive and the CEL pops up. I scan it and get P0720 (Countershaft SPD sensor circuit malfunction). I purchased a new sensor (28820-PWR-013) from Honda. When I removed the original sensor to replace it, the tip had broken off inside the transmission (pic attached). I have absolutely no idea how this is even possible. Using a strainer and coffee filters, I drained and filled the tranny 4 times in order to try to flush out the debris from the broken sensor, but nothing came out. I installed a magnetic drain plug with hopes that it will help. I installed the new sensor and cleared the code with the scanner. I take it for a drive, and still no speedometer and the CEL pops up again with P0720. I removed the sensor and again, the tip has broken off inside the transmission again (pic attached). There's obviously some type of interference going on with the sensor, but how this is possible since the transmission was never opened is beyond me. It can't imagine it being a gear alignment issue inside the transmission because it shifts perfectly... even with all the debris now in there. I read on another forum that the sensor comes with 2mm washer, however, the new one did not come with it. I also did not see a washer when I removed the original sensor. Any thoughts or insight you can provide would be greatly appreciated.
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