Chevrolet U0284
Lost Communication with Active Grille Air Shutter 1 Motor Module • U0285: Lost Communication with Active Grille Air Shutter 2 Motor Module • U1345: Engine Control Module LIN Bus 1
Quick answer
U0284 indicates lost communication with Active Grille Air Shutter 1 Motor Module. For applicable 2021–2023 Chevrolet Bolt EV and Bolt EUV vehicles in the US, an official GM/NHTSA service bulletin also lists U0285 and U1345 among DTCs that may be set.
This page separates verified manufacturer/regulator evidence from supporting material. Unsupported causes, repairs or safety conclusions are not guessed.
Watch Videos
Relevant videos play here without leaving this diagnostic page.
No sufficiently relevant embeddable video has been accepted for this diagnostic yet.
Videos are supporting material and never override OEM or regulator evidence.
1. What does U0284 mean?
U0284 indicates lost communication with Active Grille Air Shutter 1 Motor Module. For applicable 2021–2023 Chevrolet Bolt EV and Bolt EUV vehicles in the US, an official GM/NHTSA service bulletin also lists U0285 and U1345 among DTCs that may be set.
2. Technical explanation
Verified evidence identifies U0284 as “Lost Communication with Active Grille Air Shutter 1 Motor Module.” The supplied official service-bulletin evidence also names U0285 as lost communication with Active Grille Air Shutter 2 Motor Module and U1345 as Engine Control Module LIN Bus 1. The evidence provided does not establish the underlying fault cause, diagnostic procedure, or repair for U0284.
3. What system is affected?
Active Grille Air Shutter 1 Motor Module communication. The supplied evidence also references Engine Control Module LIN Bus 1 in connection with U1345.
4. How serious is this code?
Not yet established by verified evidence.
5. Symptoms you may notice
- Not yet established by verified evidence.
6. Possible causes
- Not yet established by verified evidence.
7. Can I still drive the vehicle?
Not yet established by verified evidence.
8. Can I charge the vehicle?
Not yet established by verified evidence.
9. What you can safely do
- Have the stored DTCs evaluated by a qualified Chevrolet/GM service provider.
- Do not assume that U0284 alone identifies a failed component; the verified evidence does not establish a specific cause or repair.
10. Step-by-step troubleshooting
- Retrieve and record all diagnostic trouble codes.
- Review the applicable official manufacturer service information. The supplied evidence does not establish additional diagnostic steps.
11. When to contact service
Service need is not established by the supplied verified evidence. If the DTC is present, a qualified Chevrolet/GM service provider can perform diagnosis using manufacturer procedures.
12. What the service center may check
- Confirm U0284 and record any accompanying DTCs.
- The supplied bulletin evidence lists U0285 and U1345 among additional communication-related DTCs that may be set.
- Further service checks are not yet established by verified evidence.
13. Possible repair or resolution
- Not yet established by verified evidence.
14. Affected vehicles
- Chevrolet Bolt EUV · 2021–2023 · US
- Chevrolet Bolt EV · 2021–2023 · US
15. Related TSBs / service bulletins
- NHTSA Manufacturer Communication PDF 10225708, GM bulletin 15-NA-087, published October 25, 2022. Supplied evidence lists U0284, U0285, and U1345 among DTCs that may be set. It does not, in the supplied excerpt, establish a U0284-specific cause or repair.
16. Recall information
- Not yet established by verified evidence.
17. Official manufacturer information
Applicable verified vehicle coverage: US-market 2021–2023 Chevrolet Bolt EV and 2021–2023 Chevrolet Bolt EUV. Official source supplied: NHTSA Manufacturer Communication PDF 10225708, bulletin 15-NA-087: https://static.nhtsa.gov/odi/tsbs/2022/MC-10225708-0001.pdf
19. Frequently asked questions
What does U0284 mean?
Verified evidence defines U0284 as lost communication with Active Grille Air Shutter 1 Motor Module.
Does U0284 apply to Chevrolet Bolt EV and Bolt EUV?
The supplied applicability evidence covers US-market 2021–2023 Chevrolet Bolt EV and Bolt EUV.
Can I drive or charge with U0284?
Not yet established by verified evidence.
Are U0285 and U1345 related?
The supplied official bulletin lists U0284, U0285, and U1345 among DTCs that may be set. It does not establish that they will always occur together or identify a shared cause.