GM bulletin 24-NA-136
What it saysThis service bulletin provides repair information on new Radio Software Version is W38E-174.4.1-M170-SQBR5-180.5 to correct a customer concern of radio software issues. NHTSA’s full summary ↓
GM filed this with NHTSA as a service bulletin dated Apr 4, 2025, received Aug 1, 2024, about the electrical system — 4 documents under this number. It names 3 model years across Chevrolet, GMC and Cadillac (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 service bulletin provides repair information on new Radio Software Version is W38E-174.4.1-M170-SQBR5-180.5 to correct a customer concern of radio software issues.
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 24-NA-136 | Service bulletin | Apr 4, 2025 | 11017522 | PDF, 133 KB |
| 24-NA-136 | Service bulletin | Jan 11, 2025 | 11013074 | PDF, 848 KB |
| 24-NA-136 | Service bulletin | Aug 15, 2024 | 11007730 | PDF, 847 KB |
| 24-NA-136 | Service bulletin | Jul 17, 2024 | 11005421 | PDF, 1,279 KB |
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 360 complaints with NHTSA since 2015. 71 of them name 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.
Headlights began flickering two days after purchase of vehicle. Infotainment screen that operates the headlights, as there is no physical headlight knobs or buttons, also malfunction and is inoperable. So I can not turn my headlights on or off, they're set to auto and I can not adjust it.
2024 GMC Canyon · Electrical System · filed with NHTSA Aug 5, 2024
While driving the car rapidly decelerated along with loss to steering control. The engine essentially shutdown and would not accelerate past 30 MPH with full force. Oil temperature was 280/300 and rising.
2024 Cadillac XT4 · Electrical System · filed with NHTSA Mar 21, 2025
After using turn signal for a right turn and the wheel straightens back out, the left turn signal comes on for 3-4 blinks. Has caused confusion and have had vehicles turn in front of me. Safety concern
2024 Chevrolet Colorado · Electrical System · filed with NHTSA Oct 7, 2024
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 electrical system
Source: same model, same component group112 other manufacturer communications filed against these GM models under the same component group (electrical system), newest first. The eight newest are listed; the rest are on the Chevrolet list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| 24-NA-166 | Service bulletin | Nov 7, 2025 | This technical bulletin provides repair information to correct a customer concern of DTC C1171 C1172 C1173 C1174 Tire Pressure Monitor Senso… |
| 18-NA-180 | Service bulletin | Sep 4, 2025 | This Warranty Administration service bulletin provides Lithium-Ion battery Exchange Process and Transaction Submission information. |
| 25-NA-249 | Service bulletin | Sep 3, 2025 | This service bulletin provides the correction to the condition of the Malfunction Indicator Lamp being illuminated and/or the DTC P149E set. |
| 25-NA-085 | Service bulletin | May 9, 2025 | This service bulletin provides information on software related issues and provides technicians information to update the radio software to t… |
| 22-NA-242 | Service bulletin | Apr 24, 2025 | This warranty administration bulletin provides information for dealers/technicians on System Reset and Connector Reconnect Labor Code Number… |
| 24-NA-113 | Service bulletin | Apr 23, 2025 | This service bulletin provides information for dealers/technicians on Vehicle Wide Programming Instructions. |
| 24-NA-176 | Service bulletin | Apr 18, 2025 | This technical bulletin provides repair information to correct a customer concern of Turn Signal Over Cancelling. |
| 24-NA-229 | Service bulletin | Apr 10, 2025 | This bulletin provides a procedure on how to check for a battery drain utilizing the Picoscope and how to measure the load on the system tha… |
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 24-NA-136 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 24-NA-136 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 24-NA-136 cover?
The manufacturer filed it against 3 model years across 3 brands (Chevrolet, GMC and Cadillac): 2024 Cadillac XT4, 2024 Chevrolet Colorado, 2024 GMC Canyon. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.