PERFORMED DIAG, VEH HAS P2459-00 CODE (DIESEL PARTICULATE FILTER REGENERATION FREQUENCY) VEH HAS 2453 IDLE HOURS. RECOMMEND NOT LETTING VEH IDLE FOR LONG PERIODS
PERFORM STATIONARY REGENERATION OF DIESEL PARTICULATE FILTER
DAVID M. gave our service a 5 star review on 8/27/2026
Had code P2635, fuel flow performance, performed a fuel pressure comparison reading though. During fuel pressure comparison of low pressure fuel side every once in awhile desired fuel pressure will be at 46 and fuel pressure sensor reading will drop to 30. This is a significant change in pressure and could set this code. Recommend replacing low pressure fuel pump to start with. Please note that failure of low pressure fuel pump can cause damage to high pressure fuel pump. Per TSB RECOMMEND only using 91 octane fuel.
Ray must use 91 octane fuel in the summertime to prevent Vapor locking. This is a TSB from GM.
RAY A. gave our service a 5 star review on 7/9/2026