GM bulletin PIT6144
What it saysThis Preliminary information communicates A diagnostic tip from root causing DTC: C1197 caused by a pinched air inlet hose to the suspension compressor air leveling system. NHTSA’s full summary ↓
GM filed this with NHTSA as a service bulletin dated Mar 28, 2024, received Apr 15, 2024, about the suspension. It names 19 model years across Chevrolet, GMC and Cadillac (2021–2024). 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 A diagnostic tip from root causing DTC: C1197 caused by a pinched air inlet hose to the suspension compressor air leveling system.
Trouble codes it names: C1197
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| PIT6144 | Service bulletin | Mar 28, 2024 | 10253116 | 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.
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Model years it names
Source: as the manufacturer filed themChevrolet 8 model years
GMC 7 model years
Also filed against model years this site has no page for: 2022 GMC Hummer EV Pickup.
Cadillac 4 model years
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 18 model years this bulletin names have filed 3,588 complaints with NHTSA since 2015.
We repeatedly received an error saying “Vehicle too high, drive with caution”, at which point, the suspension adjustment controls would not work and I could not lower the vehicle.
2022 GMC Yukon · Suspension · filed with NHTSA Jul 13, 2023
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 suspension
Source: same model, same component group31 other manufacturer communications filed against these GM models under the same component group (suspension), newest first. The eight newest are listed; the rest are on the Chevrolet list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| 25-NA-152 | Service bulletin | Oct 3, 2025 | this bulletin advises the tech not to replace the shock for possible air leak, but to replace the air valve on the shock. |
| N252507500 | Service campaign | Sep 17, 2025 | Certain vehicles may have a condition in which the rear lower control arm bolts were not fully torqued. Dealers are to perform a rear wheel… |
| 25-NA-110 | Service bulletin | Sep 6, 2025 | This bulletin advises the techs that the front and or rear shocks need to be replaced as a set and not 1 at a time to avoid the road and rid… |
| PI0281L | Service bulletin | Apr 17, 2025 | This preliminary informational (PI) bulletin provides information to dealership personnel that may be helpful when addressing underbody comp… |
| 18-NA-315 | Service bulletin | Apr 3, 2025 | This service bulletin advises the tech to only replace the shock that is bad and not all shocks. |
| 24-NA-099 | Service bulletin | Mar 5, 2025 | This bulletin provides a service procedure to replace the sway bar bracket retainers if found the cause of the clunking noise from front of… |
| PIT6144F | Service bulletin | Feb 27, 2025 | This Preliminary information communicates A diagnostic tip from root causing DTC: C1197 SYM 92 caused by a pinched air inlet hose to the sus… |
| PIT5981B | Service bulletin | Feb 27, 2025 | This Preliminary information communicates a tip when diagnosing an inoperative air leveling suspension system and to repair any loss of comm… |
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 PIT6144 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 PIT6144 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.
Which vehicles does PIT6144 cover?
The manufacturer filed it against 19 model years across 3 brands (Chevrolet, GMC and Cadillac): 2024 Cadillac Escalade, 2023 Cadillac Escalade, 2022 Cadillac Escalade, 2021 Cadillac Escalade, 2024 Chevrolet Suburban, 2023 Chevrolet Suburban and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.