Subaru P0021
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Quick answer
For U.S.-market 2019–2021 Subaru Crosstrek vehicles, verified evidence links P0021 to a Subaru service-information update. The supplied evidence does not establish a vehicle fault definition, symptoms, drivability, charging status, or a required repair.
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 P0021 mean?
For U.S.-market 2019–2021 Subaru Crosstrek vehicles, verified evidence links P0021 to a Subaru service-information update. The supplied evidence does not establish a vehicle fault definition, symptoms, drivability, charging status, or a required repair.
2. Technical explanation
NHTSA Manufacturer Communication PDF 10201035 (Subaru bulletin 18-214-21, dated August 11, 2021) states that diagnostic-procedure steps were added for P0011, P0014, P0021, and P0024 in the 2021 Impreza/Crosstrek diagnostics information. The supplied material describes a documentation/procedure update; it does not provide the actual P0021 diagnostic steps or establish the underlying fault mechanism.
3. What system is affected?
Not yet established by verified evidence. The supplied bulletin places P0021 within an Engine Diagnostics section, but does not identify a specific failed component or system for this code.
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 a Subaru dealer or qualified service facility consult the applicable Subaru diagnostic procedure for P0021.
- Provide the exact vehicle year, model, VIN, warning indicators, and any additional stored codes when requesting diagnosis.
10. Step-by-step troubleshooting
- The verified bulletin indicates that Subaru added diagnostic steps for P0021, along with P0011, P0014, and P0024, for applicable 2021 Impreza/Crosstrek service information.
- The actual inspection sequence, test values, and repair criteria are not included in the supplied evidence.
11. When to contact service
Service evaluation is appropriate if P0021 is present, because the supplied official communication identifies an updated Subaru diagnostic procedure. Urgency is not established by verified evidence.
12. What the service center may check
- Retrieve all stored diagnostic trouble codes and relevant vehicle information.
- Consult the applicable Subaru diagnostic procedure for P0021. Specific checks are not established by the supplied evidence.
13. Possible repair or resolution
- Not yet established by verified evidence.
14. Affected vehicles
- Subaru Crosstrek · 2019–2021 · US
15. Related TSBs / service bulletins
- Subaru Bulletin 18-214-21, dated August 11, 2021; referenced through NHTSA Manufacturer Communication PDF 10201035. It reports added diagnostic-procedure steps for P0011, P0014, P0021, and P0024 in 2021 Impreza/Crosstrek diagnostics information.
16. Recall information
- No recall is established by the supplied verified evidence.
17. Official manufacturer information
Official source: NHTSA Manufacturer Communication PDF 10201035, Subaru bulletin 18-214-21: https://static.nhtsa.gov/odi/tsbs/2021/MC-10201035-0001.pdf
19. Frequently asked questions
What does the supplied verified evidence say about P0021?
It says Subaru added diagnostic-procedure steps for P0021 in a service-information update affecting 2021 Impreza/Crosstrek diagnostics documentation.
Does this evidence identify the cause of P0021?
No. The cause is not yet established by verified evidence.
Does the bulletin prove that a repair or recall is required?
No. The supplied evidence describes a diagnostic documentation update and does not establish a specific repair or recall.