Maserati B22A9
96 persists, replace the TBM. NOTE: Ignore DTC U008000 Ethernet Bus, if it is present. This error does not affect the operation of related
Quick answer
For a 2024–2025 Maserati Granturismo (US), verified service information says that if DTC B22A9-96 remains present after the specified repeated DTC-clear/key-cycle procedure, the TBM should be replaced. The supplied evidence does not establish the code’s plain-language fault description.
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 B22A9 mean?
For a 2024–2025 Maserati Granturismo (US), verified service information says that if DTC B22A9-96 remains present after the specified repeated DTC-clear/key-cycle procedure, the TBM should be replaced. The supplied evidence does not establish the code’s plain-language fault description.
2. Technical explanation
The verified NHTSA-posted Maserati communication MAS004504 BOL 25-01 specifies this confirmation sequence: clear DTCs; key OFF; wait 2 minutes; key ON; wait 2 minutes; read DTCs; then repeat that sequence at least three times. If B22A9-96 persists, the instruction is to replace the TBM. The communication also says to ignore U008000 Ethernet Bus if it is present, because it does not affect operation of related systems; the supplied excerpt is truncated after that statement.
3. What system is affected?
TBM. The supplied verified evidence does not expand the TBM abbreviation or establish the affected vehicle function.
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
- The supplied verified evidence establishes only that a persistent B22A9-96 after the specified confirmation procedure leads to TBM replacement. It does not establish an underlying failure cause.
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 an authorized Maserati service facility or qualified technician.
- Do not treat U008000 Ethernet Bus as the cause of related-system operation issues solely because it is present; the verified communication specifically says to ignore it in this procedure.
- Do not attempt TBM replacement or high-voltage-related repairs without qualified service support.
10. Step-by-step troubleshooting
- The verified procedure is: clear DTCs, switch the key OFF, wait 2 minutes, switch the key ON, wait 2 minutes, and read DTCs.
- Repeat the clear/key-cycle/read sequence at least three times.
- If B22A9-96 persists, replace the TBM according to the verified communication.
- If U008000 Ethernet Bus is present, the communication says to ignore it; it does not affect operation of related systems, although the supplied excerpt does not identify those systems.
11. When to contact service
Contact an authorized Maserati service facility if B22A9-96 remains after the specified repeated confirmation procedure. The verified instruction is TBM replacement.
12. What the service center may check
- Perform the documented DTC-clear, key-OFF/key-ON timing sequence and read DTCs.
- Repeat the sequence at least three times.
- Confirm whether B22A9-96 persists.
- Note any U008000 Ethernet Bus DTC, but ignore it for this procedure as directed by the communication.
13. Possible repair or resolution
- If B22A9-96 persists after the specified procedure, replace the TBM.
14. Affected vehicles
- Maserati Granturismo · 2024–2025 · US
15. Related TSBs / service bulletins
- NHTSA Manufacturer Communication PDF 11012999: MAS004504 BOL 25-01, published January 13, 2025. It provides the repeated confirmation procedure and directs TBM replacement if B22A9-96 persists.
16. Recall information
No recall relationship is established by verified evidence.
17. Official manufacturer information
Verified source: NHTSA-hosted Maserati Manufacturer Communication PDF 11012999, MAS004504 BOL 25-01: https://static.nhtsa.gov/odi/tsbs/2025/MC-11012999-0001.pdf
19. Frequently asked questions
What does B22A9-96 mean?
Not yet established by the supplied verified evidence. The evidence provides a diagnostic and repair instruction rather than a plain-language definition.
What should be done if B22A9-96 persists?
After completing the documented clear/key-cycle/read sequence at least three times, replace the TBM if B22A9-96 persists.
Should U008000 Ethernet Bus be repaired as part of this procedure?
The verified communication says to ignore U008000 Ethernet Bus if present because it does not affect operation of related systems. The supplied excerpt does not identify the related systems.
Which vehicles are covered by the supplied evidence?
Maserati Granturismo, model years 2024–2025, US region.