Strange problem, started and shut down and from then on check engine and red key light steady burn, it will start after 3 or 4 times and then stay running with both lights on.
I got home and tryed to pull a code but the only thing that came up after the diganostic flash was bus-er. and it would not go past that. Later that night I tryed it again and it went thru all sections and pulled 2 codes, U1255 pn-673480 serial data error and U 1300 pn-6722-04 low serial data , was able to clear the codes, lights went out and started fine ran good for 5 miles both lights came back on and then it started the whole problem again. Hung up with bus-er Any ideas, Thanks

 

Check the connection at the ECM and make sure it's seated good. Could be a connection elsewhere as well.

 

Each of the codes you retrieved (U1255 & U1300) and also the "BUS Er" indicate a problem with the serial data communication circuit.

Here's the possible causes for U1255...

• Open battery fuse
• Open battery circuit
• Open battery ground
• Open serial data circuit
• TSM/TSSM/HFSM malfunction
• Short to ground in power circuit

And U1300...

• ECM malfunction
• TSM/TSSM/HFSM malfunction
• ECU malfunction
• Short to voltage in serial data circuit
• Radio malfunction
• Open in serial data circuit
• Speedometer malfunction
• Tachometer malfunction

"BUS Er" indicates a lack of communication within the serial data system and the same potential causes apply.

The Electrical Diagnostic Manual has a troubleshooting sequence and process for this and many more electrical issues and is worth it's weight in gold.

Without having the manual handy to troubleshoot, about the only advice I could give is to check the battery fuse and the serial data circuit wiring. That circuit consists of the LGN/V wire that runs to each module (ECM, ABS, DLC, TSM/TSSM/HFSM, Radio, Tach, & Speedometer) and it's associated ground wire.

 

thanks i will strat checking can i get the manual from harley?

 

I had a similar issue with my 06. I never use the off/run button on my controls. I always turn it off with the main switch below the handlebars. For some reason, I turned the engine off with the switch on the controls. Upon restart, the bike ran very poorly and those same lights were on. Just for ***** and giggles, I cycled the off/run switch several times, and everything was back to normal. Worth a try and doesn't cost a dime...

 

Just checking to see if you fixed this problem