well i checked trouble codes in autoenginuity:
p0421 - Warm up cat efficiency below threshold (bank1)
u100 - lost communication with ECU/PCM A
u2064 - unknown
u0101 - lost communication with TCM
u1900 - unknown
If you lose communication with Ecu that seems pretty damn big. Hmm I would double check everything under the hood and see if there is anything out of place. Are you tuned with a standback or something?
what is pcm/tcm? i went out and looked at the car and cant find anything wrong/out of place. car starts fine runs good. brakes work tpms light is not on. im lost ill be sending cobb a message in the AM.
TCM in this case would be Traction Control Module, which is tied into the ABS system.
Don't have a Transmission Control Module in a manual...
Is your ABS light on?
Kind of sounds like to me the AccessPort screwed up the ECU. But before we jump to conclusions on that, go get the codes scanned with something other than the AccessPort, autozone can do a free code scan. I'm kind of curious if the ABS and ECU codes were a fluke that the AccessPort picked up, and they aren't actually there. Because quite honestly, I don't think the AccessPort is capable of reading ABS codes. Most affordable code readers aren't, you typically need to have an ABS code scanner that runs around $500 to read ABS codes. I know my DashHawk and AutoXray code scanners can't. In order to get a CEL reader that reads ABS codes as well, the cheapest one I've seen costs around $1000. So it seems kind of fishy to me.
A forum community dedicated to Mazda 3 and all Mazda vehicle owners and enthusiasts. Come join the discussion about MazdaSpeed performance, modifications, classifieds, troubleshooting, maintenance, and more!