Chevrolet bulletin 23-NA-159
What it saysThis technical bulletin provides repair information to correct a customer concern of DTC P22FB/P22FE CALIBRATION UPDATE - REPROGRAM DEF CONTROL UNIT (DCU). NHTSA’s full summary ↓
Chevrolet filed this with NHTSA as a service bulletin dated Sep 12, 2023, received Oct 12, 2023, about the electrical system. It names 10 model years (2022–2023). 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.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationThis technical bulletin provides repair information to correct a customer concern of DTC P22FB/P22FE CALIBRATION UPDATE - REPROGRAM DEF CONTROL UNIT (DCU).
Trouble codes it names: P22FB P22FE
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 23-NA-159 | Service bulletin | Sep 12, 2023 | 10243962 | PDF, 144 KB |
What the document itself lists
The manufacturer titles it “DTC P22FB/P22FE CALIBRATION UPDATE - REPROGRAM DEF CONTROL UNIT (DCU)”.
Labour operation and the time the manufacturer allows
| Operation | Description | Time |
|---|---|---|
| L8002 | CALI UPDATE REPRGM DCU P22FB/FE | 0.4 hrs |
Read by machine from the document NHTSA serves (6 pages), read Sep 30, 2026. A part number is shown only where it matches Chevrolet’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.
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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 themAlso filed against model years this site has no page for: 2022 Chevrolet 4500; 2022 Chevrolet 4500HD; 2023 Chevrolet 4500HD; 2022 Chevrolet 4500XD; 2022 Chevrolet 5500HD; 2023 Chevrolet 5500HD; 2022 Chevrolet 5500XD; 2022 Chevrolet 6500HD; 2023 Chevrolet 6500HD.
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 1 model year this bulletin names have filed 31 complaints with NHTSA since 2015. 12 of them name Electrical System, Engine — 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.
The contact owns a 2022 Chevrolet Silverado 3500. The contact stated that while driving 35 MPH with a trailer hitched to the vehicle, the trailer brake failed to respond on and off independently. Neither an independent mechanic nor a dealer was contacted. The trailer brake failure warning light was illuminated.
2022 Chevrolet Silverado 3500HD · Electrical System · filed with NHTSA Jun 16, 2026 · ODI 11744609
I never was contacted by GM that a recall was made for my truck, by email or mail. The last two extended warranty 111k miles or May 7, 2029) repairs made by the dealer, the repair paperwork order states a “ Recall” exists but the dealer elects not to perform the repairs @ 44k miles.
2022 Chevrolet Silverado 3500HD · Engine · filed with NHTSA Feb 19, 2026 · ODI 11719202
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 group110 other manufacturer communications filed against these Chevrolet 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 |
|---|---|---|---|
| 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-121 | Service bulletin | May 13, 2025 | This service bulletin provides information on the radio software related issues to update the radio to the latest software version Y177. |
| 25-NA-119 | Service bulletin | May 9, 2025 | This service bulletin provides information on the Service Safety Restraint Message displayed on the DIC Airbag malfunction indicator illumin… |
| 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… |
| 21-NA-166 | Service bulletin | Apr 15, 2025 | This informational bulletin provides information on the turn signal stalk not cancelling and/or mis 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… |
| 23-NA-066 | Service bulletin | Apr 9, 2025 | This service bulletin refers the technician to Recall N242438501, and if closed, refer to SI to correct the condition of Malfunction Indicat… |
| 25-NA-087 | Service bulletin | Apr 3, 2025 | This service bulletin provides information on the proper Reflective High Temperature Heat and/or Insulating Tape to use for certain repairs… |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Chevrolet, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is Chevrolet 23-NA-159 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-159 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 23-NA-159 cover?
The manufacturer filed it against 10 model years: 2022 Chevrolet Silverado 3500HD, 2022 Chevrolet 4500, 2022 Chevrolet 4500HD, 2023 Chevrolet 4500HD, 2022 Chevrolet 4500XD, 2022 Chevrolet 5500HD and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.