Compression Ignition Addict
Join Date: Oct 2011
Location: Tehachapi, CA
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Welcome to the forum!
Since you mention a shunt for the GPR, am I correct in assuming you have a California 97 truck? You should also have a black disk-shaped part (pulse damper) on the back of the fuel pump if you do. Anyway, I would probably check the wiring from the Underhood Fusebox, fuse #17 to the ignition switch and from the ignition switch through UH fuse #22 to the GPR, PCM, and fuel heater. There's not much testing for the P0605 (PCM-ROM failure ... not to be confused with the P0603 Keep Alive Memory code which is usually associated with a chip or tuner). Basically with all codes cleared, you would rerun the scan tool test and if the code returns you replace the PCM and retest.
If you do have a Cali 97, I hope it's not the PCM as they are extremely hard to find (DPC-312 PCM with a MME_ code). If you absolutely can't locate one, there are some workarounds that can be done to get you going (other threads on that). Cheers!
1997 F250 SC 4x4, E4OD, 4.10 LS, Basically Stock, Relocated Block Heater Plug, External Trans Filter, Tru-Cool Max, I/C Mounted but not Plumbed
SOLD - 1994 F350 CC DRW 2WD PSD, 5 Speed, 4.10 LS, SBC Con-O, Baldwin Filter, Tymar HPX Hose, DPPI DP, Bilsteins, $12 AIC, Coolant Filter, Explorer Overhead Console, A-Pillar w/ISSPRO Black Ice, EV Boost, and EV Pyro, Modified Pedestal, Gutted EBPV.