Chevrolet U0422
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Quick answer
For applicable US 2017–2018 Chevrolet Bolt EV vehicles, GM bulletin 16-NA-407 states that CCM/HPCM U0422 may be ignored with no service necessary unless the code is current/active or BCM faults U1534 or U1538 are also present.
This page separates verified manufacturer/regulator evidence from supporting material. Unsupported causes, repairs or safety conclusions are not guessed.
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1. What does U0422 mean?
For applicable US 2017–2018 Chevrolet Bolt EV vehicles, GM bulletin 16-NA-407 states that CCM/HPCM U0422 may be ignored with no service necessary unless the code is current/active or BCM faults U1534 or U1538 are also present.
2. Technical explanation
Verified GM bulletin evidence describes a communication/availability condition involving the door-open or door-ajar switch Virtual Device Availability (VDA). The BCM may set the VDA to unavailable and does not return it to available until the door-switch state changes. The bulletin states that the ICCM—and, in a later revision, the HPCM—can set U0422 after one second when either door-ajar VDA or door-open VDA is unavailable.
3. What system is affected?
The verified bulletin evidence involves the BCM, ICCM, HPCM, and door-open/door-ajar switch VDA signals. A broader system classification is not yet established by verified evidence.
4. How serious is this code?
Not yet established by verified evidence. The bulletin does state that no service is necessary for CCM/HPCM U0422 unless it is current/active or accompanied by BCM U1534 or U1538.
5. Symptoms you may notice
- A stored U0422 DTC in the CCM, ICCM, or HPCM is established by the supplied bulletin evidence.
- Other driver-visible symptoms are not yet established by verified evidence.
6. Possible causes
- The BCM sets the door-open switch VDA or door-ajar switch VDA to unavailable.
- The BCM does not update that VDA back to available until the door-switch state changes.
- The ICCM/HPCM can set U0422 after one second of unavailable door-ajar VDA or door-open VDA.
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
- Check whether U0422 is current/active rather than relying only on a stored history entry.
- Check whether BCM DTCs U1534 or U1538 are also present.
- Use qualified Chevrolet/GM service if diagnosis is needed; the supplied GM bulletin states it is intended for professional technicians, not do-it-yourselfers.
10. Step-by-step troubleshooting
- For applicable vehicles, GM directs technicians to ignore CCM/HPCM U0422 with no service necessary unless it is current/active or accompanied by BCM U1534 or U1538.
- Further diagnostic steps are not established by the supplied verified evidence.
11. When to contact service
Contact Chevrolet/GM service if U0422 is current/active or if BCM codes U1534 or U1538 accompany it. Service need in other circumstances is not yet established by verified evidence.
12. What the service center may check
- Determine whether U0422 is current/active.
- Check for accompanying BCM faults U1534 and U1538.
- Evaluate the door-open and door-ajar switch VDA condition as applicable to the GM bulletin.
13. Possible repair or resolution
- GM bulletin 16-NA-407 says to ignore CCM/HPCM U0422 and perform no service when the code is not current/active and BCM U1534/U1538 are not present.
- A repair for current/active U0422 or U0422 accompanied by U1534/U1538 is not specified in the supplied verified evidence.
14. Affected vehicles
- Chevrolet Bolt EV · 2017–2018 · US
- Chevrolet Bolt EV · 2017 · US
15. Related TSBs / service bulletins
- GM bulletin 16-NA-407 / NHTSA manufacturer communication 10134573, published October 19, 2017: includes HPCM information and states to ignore CCM/HPCM U0422 with no service necessary unless current/active or accompanied by BCM U1534 or U1538.
- GM bulletin 16-NA-407 / NHTSA manufacturer communication 10134574, published October 4, 2017: states to ignore CCM U0422 with no service necessary unless current/active or accompanied by BCM U1534 or U1538.
- GM bulletin 16-NA-407 / NHTSA manufacturer communication 10111775, published December 15, 2016: earlier bulletin version with the CCM U0422 guidance.
16. Recall information
- No recall information was supplied in the verified evidence.
17. Official manufacturer information
Applicable database coverage lists Chevrolet Bolt EV, US market, model years 2017–2018. Official NHTSA-hosted GM bulletin: https://static.nhtsa.gov/odi/tsbs/2017/MC-10134573-9999.pdf
19. Frequently asked questions
Does U0422 always require repair on an applicable Chevrolet Bolt EV?
No. GM bulletin 16-NA-407 states that CCM/HPCM U0422 requires no service and may be ignored unless it is current/active or BCM U1534 or U1538 is also present.
What related codes does GM identify?
GM identifies BCM U1534 and U1538 as accompanying faults that change the bulletin’s no-service guidance.
Can I continue driving or charging?
Driving and charging status are not yet established by the supplied verified evidence.