[Mahyoub A.]

Ever since i started doing remote tuning my car has been losing all power under wot. Also throws a bunch of codes that i will list. Thought it could have been the tune but even when i went back to stock file the problem persisted. Its saying loss communication to chassis control module and invalid data received from ecm/pcm aswell as random misfire. Im so lost because I’ve diagnosed everything that ive seen on the forums. Checked harness by passenger header and no sign of any burnt wires. They have been ziptied a few inches away. Changed new plugs and new wires. Checked all the ground wires i could possibly see and nothing seems to be off. Was informed to check my dsx e85 sensor that i put on myself checked the main connector that i tapped into for the e85 system and everything seems to be fine. Going on about 2 weeks with this issue and im beyond frustrated. The only thing that ive yet to figure out is i just recently heard a sparking sound from under the hood when i was testing the car after i found out one of my new ngk plugs somehow is cracked(not sure if it was from factory or something cracked it). I tried check it out late at night where theres no light but still nothing. Just heard it spark few times and i believe it could be from driver front side of the car. Please point me in the right direction!!!
2018 A10 ZL1 with basic boltons
Codes :
C0242
U0401 invalid data received from ecm/pcm
U042B invalid data received from chassis control module A
P0300 random misfire detected
P0420 catalyst system efficiency below threshold bank 1

[raptor5244]

So, did you replace the cracked plug? You can scan for misfires to see what cylinder it is. This would be a good place to start.

[JustinZL1]

Ideally should list what changes were made without knowing all the facts hard to give an answer.

[Mahyoub A.]

Originally Posted by raptor5244

So, did you replace the cracked plug? You can scan for misfires to see what cylinder it is. This would be a good place to start.

I changed the cracked plug and it just ran a bit smoother but nothing seems to clear up the loss of communication codes.

[Mahyoub A.]

Originally Posted by JustinZL1

Ideally should list what changes were made without knowing all the facts hard to give an answer.

The mods done to the car? Or the changes made after the issue has happened. In terms of mods done its just dsx flex fuel jlt intake nitrous express lid kooks 2in headers 160 thermostat and thats about it

[Akura]

Originally Posted by Mahyoub A.

I changed the cracked plug and it just ran a bit smoother but nothing seems to clear up the loss of communication codes.

Change your battery and try again.

[Mahyoub A.]

Originally Posted by Akura

Change your battery and try again.

Changed battery out. Turns out the old battery from dealer was rated a bit lower than the car called for. Changed the battery with a stonger one thats rated 760 when the car calls for 700. Sadly that didnt solve anything..

[Camaro1973]

Originally Posted by Mahyoub A.

I changed the cracked plug and it just ran a bit smoother but nothing seems to clear up the loss of communication codes.

If you flashed the car and it lost communication when flashing that is why you have these codes. Only way to clear them is to remove the battery for at least 30 minutes. You can’t clear these codes with hp tuners.