GM bulletin 23-NA-149
What it saysThis technical bulletin provides a procedure to correct the condition of Trailer Brake Disabled and/or DTC C1114 Stored During Pulling a Trailer with a Battery, Generator or Solar Charger. NHTSA’s full summary ↓
GM filed this with NHTSA as a service bulletin dated Oct 26, 2024, received Oct 10, 2023, about the service brakes — 4 documents under this number. It names 13 model years across Chevrolet, GMC and Cadillac (2023–2024). 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 technical bulletin provides a procedure to correct the condition of Trailer Brake Disabled and/or DTC C1114 Stored During Pulling a Trailer with a Battery, Generator or Solar Charger.
Trouble codes it names: C1114
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 23-NA-149 | Service bulletin | Oct 26, 2024 | 11011120 | PDF, 126 KB |
| 23-NA-149 | Service bulletin | Jun 7, 2024 | 11002020 | PDF, 142 KB |
| 23-NA-149 | Service bulletin | Feb 15, 2024 | 10250580 | PDF, 498 KB |
| 23-NA-149 | Service bulletin | Sep 15, 2023 | 10243754 | PDF, 498 KB |
What the document itself lists
Parts the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| 23306694 | Colorado/ | — | eBay Motors → |
| 84857588 | Suburban | — | eBay Motors → |
| 23337305 | — | — |
Read by machine from the document NHTSA serves (2 pages), read Sep 30, 2026. A part number is shown only where it matches GM’s own catalogue shape, an operation only with its code and time, and a description only where the reader got it whole; anything it could not settle is left out, and the PDF is the record. Times are the manufacturer’s warranty allowances, not a quote. Listings and prices on eBay Motors are the seller’s.
Affiliate disclosure: some links on this page are affiliate links. If you request a quote or buy through them we may earn a commission at no extra cost to you. Nothing on this page changes because of it.
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.
Doing the repair yourself, or pricing it before the shop does? Search the part by fitment on eBay Motors — the listing and the price are the seller’s.
Find the integrated trailer brake control for the 2023 Colorado →Affiliate disclosure: some links on this page are affiliate links. If you request a quote or buy through them we may earn a commission at no extra cost to you. Nothing on this page changes because of it.
Model years it names
Source: as the manufacturer filed themChevrolet 7 model years
GMC 5 model years
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 13 model years this bulletin names have filed 2,326 complaints with NHTSA since 2015. 603 of them name Electrical System, Service Brakes — 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.
Bought new and there was a brake pad sensor message immediately that we took it to the dealer several times for and nothing was done other than clearing the code and giving it back. Was in accident 1/24 and it was found that there was a frayed/damaged wire in the break module and break pad sensor that I feel could have led to the accident
2023 Chevrolet Tahoe · Service Brakes · filed with NHTSA Apr 2, 2024
The contact owns a 2024 GMC Sierra 3500. The contact stated while driving at approximately 60 MPH and towing a Forest River Riverstone Legacy 5th Wheel trailer, the brake pedal was depressed to slow for oncoming stopped traffic; however, the vehicle failed to respond as needed with the “Service Trailer Brake” warning light illuminated.
2024 GMC Sierra 3500HD · Electrical System · filed with NHTSA Jul 9, 2025
During the morning drive, while in one pedal driving mode, the need to apply more brake due to a quick change of traffic lights occurred. The brakes felt hard and the vehicle did not feel like it was stopping as quickly as it normally would. When I parked the vehicle and exited no warning lights or other items were shown on the dash.
2024 GMC Hummer EV · Service Brakes · filed with NHTSA Aug 25, 2026
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 service brakes
Source: same model, same component group47 other manufacturer communications filed against these GM models under the same component group (service brakes), newest first. The eight newest are listed; the rest are on the Chevrolet list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| N252521980-01 | Service campaign | Oct 31, 2025 | Certain vehicles listed above, may have a condition in which the Brake System Control Module does not have the latest software. Dealers are… |
| N252521980 | Service campaign | Oct 22, 2025 | Certain vehicles, may have a condition in which the Brake System Control Module does not have the latest software. Dealers are to reprogram… |
| 23-NA-201 | Service bulletin | Sep 6, 2025 | This service bulletin advises the technician of a possible loose ground that may be causing customer concerns of Loss of Steering Assist and… |
| 25-NA-264 | Service bulletin | Sep 3, 2025 | This informational bulletin provides information on Automated Brake Bleed and/or Brake Hydraulic Test procedure fails when attempting to per… |
| N252499750 | Service campaign | Apr 14, 2025 | Certain vehicles listed above may have a condition in which the front brake lines are below torque specification. Dealers will inspect and i… |
| 25-NA-064 | Service bulletin | Mar 20, 2025 | This informational bulletin provides information on the brake system warning lamp illuminated on driver information center (DIC), brake peda… |
| PIT6347A | Service bulletin | Mar 11, 2025 | This Preliminary information communicates an issue with ABS SES MIL / Service Brake System / Service StabiliTrak / BSCM DTC P0606 P0562 and… |
| PIT6347 | Service bulletin | Feb 25, 2025 | This Preliminary information communicates an issue with ABS SES MIL / Service Brake System / Service StabiliTrak / BSCM DTC P0606 P0562 and… |
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 23-NA-149 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 23-NA-149 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 23-NA-149 cover?
The manufacturer filed it against 13 model years across 3 brands (Chevrolet, GMC and Cadillac): 2023 Cadillac Escalade, 2023 Chevrolet Colorado, 2024 Chevrolet Silverado, 2023 Chevrolet Silverado, 2024 Chevrolet Silverado 2500HD, 2024 Chevrolet Silverado 3500HD and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.