Toyota U0164
2021 model year Highlander, Highlander Hybrid, RAV4, and RAV4 Hybrid; and 2021 model year RAV4 Prime vehicles equipped with Premium Audio (version 1383) may experience the followin
Quick answer
Toyota bulletin T-SB-0019-21 Rev identifies U0164 as an intermittent DTC that may occur with Premium Audio version 1383-related multimedia concerns. The supplied evidence does not establish a specific fault meaning for U0164 or a vehicle-safety risk.
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 U0164 mean?
Toyota bulletin T-SB-0019-21 Rev identifies U0164 as an intermittent DTC that may occur with Premium Audio version 1383-related multimedia concerns. The supplied evidence does not establish a specific fault meaning for U0164 or a vehicle-safety risk.
2. Technical explanation
NHTSA-hosted Toyota manufacturer communications T-SB-0019-21 Rev and Rev2 list intermittent U0164 among several DTCs associated with an Audio Head Unit Software Update (Denso-Ten). The evidence describes multimedia, meter-display, HVAC-screen, Bluetooth, and Android Auto-related conditions in the bulletin context. It does not establish that U0164 alone confirms a failed component, wiring fault, or high-voltage-system fault.
3. What system is affected?
Verified evidence places U0164 in the context of the Premium Audio/multimedia head-unit software bulletin. No further system definition is established by the supplied evidence.
4. How serious is this code?
Not yet established by verified evidence.
5. Symptoms you may notice
- U0164 may be intermittent.
- The bulletin context includes concerns involving charging-screen information, meter Audio-tab information, HVAC controls or display behavior, Bluetooth reconnection after an Android Auto call, and Bluetooth audio behavior after Android Auto is connected and disconnected.
6. Possible causes
- Toyota bulletin T-SB-0019-21 Rev/Rev2 associates the listed intermittent DTCs, including U0164, with an Audio Head Unit Software Update (Denso-Ten).
- A specific root cause for U0164 is 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
- Record whether U0164 is intermittent and note any multimedia, meter-display, HVAC-screen, Bluetooth, Android Auto, or charging-screen concerns.
- Have a Toyota dealer or qualified service facility check whether T-SB-0019-21 Rev/Rev2 applies to the vehicle and installed multimedia software.
10. Step-by-step troubleshooting
- Verify the exact vehicle model year, market, audio-system configuration, and multimedia software version.
- Check for U0164 and the other bulletin-listed intermittent DTCs: U1110, U0100, U0129, U0198, and U0265.
- Refer to Toyota T-SB-0019-21 Rev/Rev2 for the applicable Audio Head Unit Software Update procedure.
11. When to contact service
Contact a Toyota dealer or qualified service facility to confirm bulletin applicability and evaluate the intermittent DTC and associated multimedia concerns.
12. What the service center may check
- Confirm applicability of Toyota T-SB-0019-21 Rev/Rev2.
- Identify whether the vehicle has the affected Premium Audio configuration and software version referenced by the bulletin.
- Check for U0164 and related intermittent DTCs.
- Evaluate reported infotainment, display, HVAC-screen, Bluetooth, Android Auto, and charging-screen symptoms in the bulletin context.
13. Possible repair or resolution
- Toyota T-SB-0019-21 Rev/Rev2 identifies an Audio Head Unit Software Update (Denso-Ten).
- The supplied evidence does not establish the exact repair outcome for an individual vehicle.
14. Affected vehicles
- Toyota Prius Prime · 2021–2022 · US
- Toyota Prius Prime · 2021 · US
- Toyota RAV4 Prime · 2021–2022 · US
- Toyota RAV4 Prime · 2021 · US
15. Related TSBs / service bulletins
- Toyota T-SB-0019-21 Rev, Audio Head Unit Software Update (Denso-Ten), published July 9, 2021. NHTSA document: https://static.nhtsa.gov/odi/tsbs/2021/MC-10201369-9999.pdf
- Toyota T-SB-0019-21 Rev2, Audio Head Unit Software Update (Denso-Ten), published November 12, 2021. NHTSA document: https://static.nhtsa.gov/odi/tsbs/2021/MC-10204562-9999.pdf
16. Recall information
- Not yet established by verified evidence.
17. Official manufacturer information
Verified official evidence consists of NHTSA-hosted Toyota manufacturer communications T-SB-0019-21 Rev and Rev2. The supplied applicability records include US-market 2021 Prius Prime, 2021–2022 Prius Prime, 2021 RAV4 Prime, and 2021–2022 RAV4 Prime entries; however, the supplied bulletin excerpts specifically reference 2021 RAV4 Prime and do not establish full bulletin applicability for every listed record.
19. Frequently asked questions
Is U0164 a confirmed high-voltage or charging-system fault?
Not yet established by verified evidence. The supplied Toyota bulletin places U0164 in an audio head-unit software-update context.
Can U0164 be intermittent?
Yes. Both supplied bulletin summaries list U0164 among intermittent DTCs.
What Toyota service information is associated with U0164?
Toyota T-SB-0019-21 Rev and Rev2 identify an Audio Head Unit Software Update (Denso-Ten) in the context of intermittent U0164 and other listed DTCs.