Join Date: Oct 2018
Location: Calgary Alberta
Did I limp it? Or a glitch in the Matrix?
Hey y'all. Long post warning.
So im halfway through my first camper haul through the mountains with my new LLY head swap. 8000lbs max, fairly fresh swap, at around 20k kms on it.
So I'm shootin bull with the wife 5 hours into the 18 hour drive, and I forgot cruise on up a fairly steep, but short grade. Oops.
Downshifted to 4th, felt like it slipped a touch and immediately threw code P1626 and P0700. Also went into sort of a limp mode, but did not display this on the DIC. It said "Shift Range Inhibit".
I pulled over, cleared the codes, restarted the truck and went on my merry way. There is a hill heading west out of Kelowna, BC that's like 25 damn kms of 8% grade. It's crazy. But I just downshifted beforehand and kept er at 2200-2500 rpm and hasn't skipped a beat for the rest of the trip so far. FWIW, I got a high score of only 1354F egt, 225F coolant, and just tickled 210 on trans temp. Fan kicked on and everything cooled as expected.
So I searched for the codes and they don't really go hand in hand with what the dash told me. P1626 comes up with a theft deterrent thing, and maybe NBSU switch. However mine is brand new AC Delco.
Any ideas? Gremlins?
It also seems like a very loud rattle in the 2500+ rpm range. Is that normal? Sounds like noisy valves or something. Obviously sounds normal at idle.
Wish me luck the ride back home haha.
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2003 Sierra 2500 Crew 4x4–Charcoal Grey Metallic
325k kms and counting
LLY Head swap
LBZ full intake w/MP
4" Straight pipe
EFI Live (E. Stock/30HP/60HP Tow/high idle/No start)
Edge CTS2 with EGT