Immediate help needed. Checksum failed: $0548
Hey guys. New to the forum but have been going back and forth with Les from Silver Bullet Tuning about tuning my dad's '06 Megacab. Well, initially, it was tuned with a Smarty Jr. Due to that, the ECM was "locked" and wouldn't allow a reading. As suggested by Les, we tried a full flash with a stock tune that he sent me. That was unsuccessful. We then tried another tune from Tune File Depot. Same results. We tried flashing both tunes more than once.
We are now stuck with a disabled vehicle and need it in 2 days! The V2's bootblock and firmware are up-to-date according to the control panel as well as the latest V7.5 and V8 software.
HELP!
Immediate help needed. Checksum failed: $0548
Make sure your V2 is formatted and programmed for the CMB849 ECM. Plug V2 to computer, open Scan and tune V8, click BBx tab, click on the red arrow down tab, format config file, then click on the scan tab and tune tab, select the above ECM, then under the same red arrow down tab, program all files (slower.) All this pertains to flashing standalone. You didn't specify if you were attempting to flash standalone or pass thru.
Re: Immediate help needed. Checksum failed: $0548
You tried flashing the stock file back in I'm assuming. You may have to disable checksums in the tune. Not recommended but I had to do that once before for it to flash back in.
Re: Immediate help needed. Checksum failed: $0548
O think you need a trip to the dealer. Get a fresh file before your ecm becomes a doorstop if it already hasn't
Immediate help needed. Checksum failed: $0548
Anti-theft disabled or enabled? I know that has proven to be a hinderance in the past. Just not sure which way to go with it.