2001 LB7 fuel system/limp mode problem SOLVED

[Seanlb7]

I have a 2001 chevy 2500HD with the LB7 duramax, one day the check service engine soon light came on and thw truck wont excede 2000rpm, please let me know if the JK tune will fix this issue

[DmaxMaverick]

I have a 2001 chevy 2500HD with the LB7 duramax, one day the check service engine soon light came on and thw truck wont excede 2000rpm, please let me know if the JK tune will fix this issue

Welcome aboard!

Much depends on why. If the SES lamp is on, there are DTC's stored. You need to read the codes to find out why it limped. It may be a simple matter, or it could be serious. No knowing without the codes.

[Kennedy]

I have a 2001 chevy 2500HD with the LB7 duramax, one day the check service engine soon light came on and thw truck wont excede 2000rpm, please let me know if the JK tune will fix this issue

Welcome aboard!

Much depends on why. If the SES lamp is on, there are DTC's stored. You need to read the codes to find out why it limped. It may be a simple matter, or it could be serious. No knowing without the codes.

Yes check for DTC's. There may or may not be codes present. Having done this for many years now I with relate a few findings;

1) I have never seen the issue fixed with "parts"
2) I have had people claim to have spent as much as $9k chasing this only to be fixed with tuning
3) The tuning fix does not eliminate the need for fuel system upgrades (lift pump etc)

More reading:

http://www.kennedydiesel.com/docs/Du...20detected.htm