Chevrolet P0445
Some leaks will only be noticeable under pressure
Quick answer
For Chevrolet vehicles covered by GM bulletin 21-NA-124, P0445 warrants an EVAP-system assembly and connection inspection. The bulletin states that some leaks are only noticeable under pressure.
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 P0445 mean?
For Chevrolet vehicles covered by GM bulletin 21-NA-124, P0445 warrants an EVAP-system assembly and connection inspection. The bulletin states that some leaks are only noticeable under pressure.
2. Technical explanation
Verified NHTSA-hosted GM bulletin 21-NA-124 says that, for DTC P0445, it is crucial to investigate whether the EVAP system was properly assembled. It directs inspection of all purge connections for proper installation and inspection of purge lines for damage or wear. If damage is observed, the bulletin directs confirmation with a smoke test and notes that some leaks are only noticeable under pressure.
3. What system is affected?
EVAP system, including purge connections and purge lines.
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
- An EVAP system that was not properly assembled.
- Purge connections that are not properly installed.
- Damage or wear along purge lines.
- A leak that is only noticeable under pressure.
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
- Arrange diagnosis by a qualified service facility.
- Provide the technician with DTC P0445 and GM bulletin 21-NA-124.
- Do not attempt high-voltage repairs; the verified evidence concerns the EVAP system and does not establish any high-voltage repair procedure.
10. Step-by-step troubleshooting
- Investigate whether the EVAP system was properly assembled.
- Inspect all purge connections for proper installation.
- Inspect purge lines for signs of damage or wear.
- If damage is observed, confirm it with a smoke test. The bulletin notes that some leaks will only be noticeable under pressure.
11. When to contact service
Service is recommended for proper EVAP-system inspection and any required smoke-test confirmation. Urgency is not yet established by verified evidence.
12. What the service center may check
- Confirm the EVAP system was properly assembled.
- Inspect every purge connection for proper installation.
- Check purge lines for damage or wear.
- Where damage is observed, perform a smoke test to confirm the condition, recognizing that some leaks may only be visible under pressure.
13. Possible repair or resolution
- Not yet established by verified evidence. The supplied bulletin provides inspection and confirmation guidance but does not establish a specific repair outcome.
14. Affected vehicles
- Chevrolet Bolt EV · 2011–2021 · US
- Chevrolet Spark · 2011–2021 · US
- Chevrolet Spark · 2014–2016 · US
- Chevrolet Volt · 2011–2021 · US
15. Related TSBs / service bulletins
- GM bulletin 21-NA-124, published through NHTSA manufacturer communications on May 25, 2021 and December 14, 2022. It applies to the supplied Chevrolet applicability records and provides EVAP assembly, connection, line-condition, and smoke-test guidance for P0445.
16. Recall information
No recall relationship is established by verified evidence.
17. Official manufacturer information
Official NHTSA-hosted GM bulletin 21-NA-124: https://static.nhtsa.gov/odi/tsbs/2022/MC-10228888-0001.pdf
19. Frequently asked questions
What does P0445 mean in the supplied Chevrolet evidence?
The verified diagnostic title is “Some leaks will only be noticeable under pressure.” GM bulletin 21-NA-124 directs inspection of EVAP-system assembly, purge connections, and purge lines for P0445.
What should be checked for P0445?
The verified bulletin says to investigate proper EVAP-system assembly, inspect all purge connections for proper installation, and look for damage or wear along purge lines. If damage is observed, confirm it by smoke test.
Can I drive or charge with P0445?
Not yet established by verified evidence.