P1516 and reduced engine power - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Boog** · 11-22-2022, 02:00 PM

Yeah, I've that code going on with my 2003 Tahoe, 175,000 miles. It has never had that one until a few months ago. Code said throttle pedal sensor so I put on a new one and all was good for 4 months then it returned. This time I replaced the throttle position sensor and it was good for 4 days. No engine work had been done to possibly cause wiring damage. This truck is rust free and grounds are clean. Recently it seemed to be cold temp related but not every time. 5 times late yesterday and 4 this morning. Kind of a hindrance when having to travel the highway to work. Due to the miles and age, I didn't mind replacing those two sensors. So, what now?
Searching the 'net there are all kinds of fixes. What worked for you?

**hatzie** · 11-22-2022, 08:00 PM

Is your replacement TPS a GM part or aftermarket?

**Boog** · 11-23-2022, 08:12 AM

It is aftermarket. I am now looking for an AC Delco complete throttle body and TPS. At 275,000 miles, it's time.

**Boog** · 11-26-2022, 06:47 AM

New Delco throttle body assembly arrived and installed. Seems to have cured the problem.

**hatzie** · 11-27-2022, 06:44 PM

Yeah. That seems to be the way a lot of aftermarket electronics end up.
Jeep crank position sensors are a nasty one. Probing the output from aftermarket CPS and good OEM Jeep CPS with a scope is a conundrum. The signals look exactly the same but the aftermarket Jeep CPS causes all kinds of strange ghost in the machine kind of problems that disappear when you plug in the OEM part.

Glad you fixed the issue.

11-22-2022, 02:00 PM	#1
Boog laying low Join Date: Mar 2001 Location: Searcy, Ark. USA Posts: 13,534	P1516 and reduced engine power Yeah, I've that code going on with my 2003 Tahoe, 175,000 miles. It has never had that one until a few months ago. Code said throttle pedal sensor so I put on a new one and all was good for 4 months then it returned. This time I replaced the throttle position sensor and it was good for 4 days. No engine work had been done to possibly cause wiring damage. This truck is rust free and grounds are clean. Recently it seemed to be cold temp related but not every time. 5 times late yesterday and 4 this morning. Kind of a hindrance when having to travel the highway to work. Due to the miles and age, I didn't mind replacing those two sensors. So, what now? Searching the 'net there are all kinds of fixes. What worked for you? __________________ Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross

11-22-2022, 08:00 PM	#2
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,977	Re: P1516 and reduced engine power Is your replacement TPS a GM part or aftermarket? __________________ 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.

11-23-2022, 08:12 AM	#3
Boog laying low Join Date: Mar 2001 Location: Searcy, Ark. USA Posts: 13,534	Re: P1516 and reduced engine power It is aftermarket. I am now looking for an AC Delco complete throttle body and TPS. At 275,000 miles, it's time. __________________ Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross

11-26-2022, 06:47 AM	#4
Boog laying low Join Date: Mar 2001 Location: Searcy, Ark. USA Posts: 13,534	Re: P1516 and reduced engine power New Delco throttle body assembly arrived and installed. Seems to have cured the problem. __________________ Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross

11-27-2022, 06:44 PM	#5
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,977	Re: P1516 and reduced engine power Yeah. That seems to be the way a lot of aftermarket electronics end up. Jeep crank position sensors are a nasty one. Probing the output from aftermarket CPS and good OEM Jeep CPS with a scope is a conundrum. The signals look exactly the same but the aftermarket Jeep CPS causes all kinds of strange ghost in the machine kind of problems that disappear when you plug in the OEM part. Glad you fixed the issue. __________________ 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.



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