GM bulletin PIP5660A
What it saysThis Preliminary information communicates the possibility of a reduced power message with dtc p2101 and/or p1516 due to potential throttle body issue. NHTSA’s full summary ↓
GM filed this with NHTSA as a service bulletin dated Dec 8, 2023, received Jan 29, 2024, about the power train. It names 3 model years across Chevrolet, GMC and Cadillac (2019). A service bulletin is not a safety recall: it is the manufacturer telling its dealers how to diagnose or repair a condition, and whether the work is paid for depends on the warranty in force. Quoting the number at a service desk can save a diagnosis.
One page for every brand it was filed under. Each brand’s bulletins: Chevrolet · GMC · Cadillac.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationThis Preliminary information communicates the possibility of a reduced power message with dtc p2101 and/or p1516 due to potential throttle body issue.
Trouble codes it names: P1516 P2101
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| PIP5660A | Service bulletin | Dec 8, 2023 | 10249279 | not found |
The summary is NHTSA’s abstract of the document, as filed under 49 CFR 579.5. One communication is usually filed as several documents — the bulletin, a dealer notice, an owner letter — and the number on any of them finds this page. A PDF link is shown only once NHTSA’s own server has been seen to serve that document; the rest are checked over the following nights. Quote the number at a service desk; it is what the dealer’s system is keyed on.
Model years it names
Source: as the manufacturer filed themChevrolet 1 model year
GMC 1 model year
Cadillac 1 model year
A vehicle page’s bulletin list shows the newest few communications filed against that model year; the count there is every one.
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What owners reported
Source: NHTSA complaint databaseOwners of the 3 model years this bulletin names have filed 1,806 complaints with NHTSA since 2015. 777 of them name Power Train, Electrical System — the same broad component group this bulletin is filed under. NHTSA groups complaints coarsely, so that means the same area of the vehicle, not necessarily the same fault.
On the 2019 Chevrolet Silverado, the 106 owners who gave an odometer reading for Power Train reported it at a median of 15,000 miles. That figure is one model year’s, not the whole range this bulletin covers — medians from different model years are not averaged.
The contact owns a 2019 GMC Sierra Denali. The contact stated while parking the vehicle, the vehicle inadvertently stalled without warning. The contact attempted several times to restart the vehicle however, the vehicle would not restart. The contact attempted to jump start the vehicle and the failed to start.
2019 GMC Sierra · Power Train · filed with NHTSA Jul 20, 2022 · ODI 11474899
I took my suv in for diagnostics to a certified GM dealership at least twice while still under warranty. The check engine light was on, the car was behaving abnormally as well as making unusual concerning noises. The dealership sent me away saying no codes showed up and they couldn’t find a problem.
2019 Cadillac XT4 · Power Train · filed with NHTSA Jul 3, 2026 · ODI 11748115
Rodents chewed wiring because it is soy based. I'm lucky because my car was not disabled while driving etc because the EVAP system was affected . This could have been much worse and could have caused death etc if it happened to another system of the car.
2019 Cadillac XT4 · Electrical System · filed with NHTSA Oct 19, 2026 · ODI 11772069
In depth: 2019 Chevrolet Silverado transmission and drivetrain problems → · 2019 Chevrolet Silverado electrical problems → · 2019 GMC Sierra transmission and drivetrain problems → · 2019 GMC Sierra electrical problems →
A complaint is one owner’s account, not a defect finding, and a bulletin is not a recall. Nothing here says this bulletin was issued because of these complaints, or that the repair it describes fixed them. Complaint files on this site begin in 2015.
More bulletins about the power train
Source: same model, same component group104 other manufacturer communications filed against these GM models under the same component group (power train), newest first. The eight newest are listed; the rest are on the Chevrolet list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| N252502891-01 | Service campaign | Aug 20, 2026 | Certain vehicles may have a condition in which the internal differential nut was cross threaded or missing during assembly. Dealers will rev… |
| N252517790 | Service campaign | Oct 14, 2025 | Certain vehicles, equipped with 8L80 or 8L90 Transmissions, may have a condition in which the reaction carrier cracks. Dealers are to replac… |
| N242454441 -03 | Service campaign | Oct 9, 2025 | Certain vehicles listed above, may have a condition where the transmission control valve has worn, resulting in a gradual loss of pressure w… |
| 25-NA-080 | Service bulletin | Sep 4, 2025 | This service bulletin provides a procedure to overhaul the control valve to replace a plate and worn down check ball to correct the customer… |
| N252494003-01 | Service campaign | Jun 26, 2025 | Certain vehicles listed above, may have a condition where the connecting rod and/or crankshaft engine components in these vehicles may have… |
| N242483540-01 | Service campaign | May 21, 2025 | Certain vehicles listed above may have a condition in which the transmission may not shift properly. Dealers are to replace the transmission… |
| 22-NA-182 | Service bulletin | May 16, 2025 | This service bulletin advises the technician to check if the transmission cooler lines are twisted to correct customer concerns of Harsh Shi… |
| 24-NA-133 | Service bulletin | May 14, 2025 | This informational bulletin provides information on Wheel Drive Shaft Retention Snap Ring Design Change. |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Chevrolet, GMC and Cadillac, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is GM PIP5660A a recall?
No. A service bulletin is a manufacturer communication filed with NHTSA under 49 CFR 579.5; a safety recall carries an NHTSA campaign number (two digits, a letter, six digits) and a federal duty to repair for free. Check the vehicle’s recalls by VIN at nhtsa.gov/recalls, or on its page here.
Is the PIP5660A repair free?
Not automatically. A service bulletin describes how to diagnose or repair a condition; who pays depends on the warranty in force, any extension, and the dealer. Quoting the number can save a diagnosis either way. Every GM warranty extension on file lists the ones GM has filed.
Which vehicles does PIP5660A cover?
The manufacturer filed it against 3 model years across 3 brands (Chevrolet, GMC and Cadillac): 2019 Cadillac XT4, 2019 Chevrolet Silverado, 2019 GMC Sierra. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.