GM bulletin PIP5843C
What it saysThis Preliminary information communicates to the dealers information related to a Malfunction Indicator Lamp (MIL) Illuminated During Cold Ambient Temperatures with DTCs P30C3 and/or P30BF P30C7 P30CB Setting. NHTSA’s full summary ↓
GM filed this with NHTSA as a service bulletin dated Jun 20, 2023, received Jul 17, 2023, about the exterior lighting. It names 16 model years across Chevrolet, GMC and Cadillac (2019–2023). 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.
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 to the dealers information related to a Malfunction Indicator Lamp (MIL) Illuminated During Cold Ambient Temperatures with DTCs P30C3 and/or P30BF P30C7 P30CB Setting.
Trouble codes it names: P30BF P30C3 P30C7 P30CB
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| PIP5843C | Service bulletin | Jun 20, 2023 | 10239172 | 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 6 model years
GMC 6 model years
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 16 model years this bulletin names have filed 6,692 complaints with NHTSA since 2015.
Nighttime backing up is to dark to see in the camera. The reverse lights are not bright enough to highlight the area to see correctly. This is a major concern as i almost backed up over my child at night as i could not see them in the camera. Please address with manufacture to resolve the issue.
2023 GMC Sierra · Exterior Lighting · filed with NHTSA Feb 9, 2024
I use the right turn signal to make a right turn at an intersection. I proceed with the turn and begin to accelerate out of the turn, as the steering wheel unturns the right turn signal is supposed to cancel as the steering wheel straightens out.
2023 GMC Canyon · Exterior Lighting · filed with NHTSA Oct 30, 2024
HID headlights flicker/shake when driving over any size bump, or when you close the vehicle door
2019 GMC Sierra · Exterior Lighting · filed with NHTSA Apr 27, 2020
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 exterior lighting
Source: same model, same component group18 other manufacturer communications filed against these GM models under the same component group (exterior lighting), newest first. The eight newest are listed; the rest are on the Chevrolet list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| 07-08-42-006U | Service bulletin | Jun 2, 2025 | This service bulletin provides technicians with information on available BCM calibrations to restore bulb outage detection on vehicles produ… |
| PIE0827 | Service bulletin | Apr 10, 2025 | This engineering informational bulletin is requesting information from technicians to perform the check list provided and contact the engine… |
| 07-08-42-006T | Service bulletin | Mar 25, 2025 | This service bulletin provides technicians with information on available BCM calibrations to restore bulb outage detection on vehicles produ… |
| PIT6280A | Service bulletin | Feb 13, 2025 | This Preliminary information communicates that a dealer may install the perimeter rocker lighting kit and find that it will not illuminate.… |
| 01-08-42-001Q | Service bulletin | Jan 27, 2025 | This service bulletin provides information on Exterior Lamp Condensation and Water Leak Information and Replacement Guidelines. |
| PIT6280 | Service bulletin | Nov 8, 2024 | This Preliminary information communicates that a dealer may install the perimeter rocker lighting kit and find that it will not illuminate.… |
| PIT6203A | Service bulletin | Sep 9, 2024 | This Preliminary Information communicates a possible momentary flicker or flash of the LED headlamps or DRLs. |
| PIT6203 | Service bulletin | Sep 6, 2024 | This Preliminary Information communicates a possible momentart flicker or flash of the LED headlamps or DRLs. |
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 PIP5843C 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 PIP5843C 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 PIP5843C cover?
The manufacturer filed it against 16 model years across 3 brands (Chevrolet, GMC and Cadillac): 2023 Cadillac CT4, 2022 Cadillac CT4, 2021 Cadillac CT4, 2020 Cadillac CT4, 2023 Chevrolet Colorado, 2023 Chevrolet Silverado and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.