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**hatzie** · 12-09-2021, 10:54 AM

2001 doesn't have AFM.
That being said. The oil pressure senders are not GMs' most reliable engine sensor.
If it's the original part, your pressure sender is also not in its' first flush of youth at 20-21 years of age.

I'd change the oil pressure sensor out with a GM 12562267 or AC Delco D1818A and see what that gets you. These #s should be good for 1999-2002 5.3L & 4.8L pickups. If you go with Delco make sure it's the OEM grade or at least the professional grade part. RockAuto shows AC Delco OEM grade D1818A for $33.89

If the sensor resolves the issue then there's no reason to dig deeper.
Deeper would be the oil pump pickup o-ring and looking over the cam plate for leaks. Both will take an excursion behind the timing cover and into the oil pan to even look at.

12-09-2021, 10:54 AM	#4
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,919	Re: Oil Pressure Puzzler 2001 doesn't have AFM. That being said. The oil pressure senders are not GMs' most reliable engine sensor. If it's the original part, your pressure sender is also not in its' first flush of youth at 20-21 years of age. I'd change the oil pressure sensor out with a GM 12562267 or AC Delco D1818A and see what that gets you. These #s should be good for 1999-2002 5.3L & 4.8L pickups. If you go with Delco make sure it's the OEM grade or at least the professional grade part. RockAuto shows AC Delco OEM grade D1818A for $33.89 If the sensor resolves the issue then there's no reason to dig deeper. Deeper would be the oil pump pickup o-ring and looking over the cam plate for leaks. Both will take an excursion behind the timing cover and into the oil pan to even look at. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful. Last edited by hatzie; 12-09-2021 at 11:07 AM.