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Mazda B1B36

04 Front corner ultrasonic sensor (RH) signal circuit malfuncti on B1B36:49 Front corner ultrasonic sensor (RH) power supply circuit m alfunction B1B38:04 Front ultrasonic sensor (

DriveNot yet established by verified evidence.
ChargeNot yet established by verified evidence.
ServiceContact a Mazda dealer or qualified repair facility, particularly if the warning appeared after body work, paint work, or ultrasonic sensor replacement.
Confidence95%

Quick answer

For a 2022 US Mazda MX-30, DTC B1B36 is documented in a Mazda service communication involving an “Ultrasonic Sensor Malfunction” warning after front and/or rear ultrasonic sensor replacement during body or paint repair. The supplied evidence identifies B1B36:04 as a right-hand front corner ultrasonic sensor signal-circuit malfunction and B1B36:49 as a power-supply-circuit malfunction.

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 B1B36 mean?

For a 2022 US Mazda MX-30, DTC B1B36 is documented in a Mazda service communication involving an “Ultrasonic Sensor Malfunction” warning after front and/or rear ultrasonic sensor replacement during body or paint repair. The supplied evidence identifies B1B36:04 as a right-hand front corner ultrasonic sensor signal-circuit malfunction and B1B36:49 as a power-supply-circuit malfunction.

2. Technical explanation

The verified Mazda communication lists two B1B36 variants: B1B36:04, front corner ultrasonic sensor (RH) signal circuit malfunction; and B1B36:49, front corner ultrasonic sensor (RH) power supply circuit malfunction. The supplied evidence specifically describes these codes as potentially stored after replacement of front and/or rear ultrasonic sensors during body or paint repair.

3. What system is affected?

Front right-hand corner ultrasonic sensor circuit / ultrasonic parking-sensor system.

4. How serious is this code?

Not yet established by verified evidence.

5. Symptoms you may notice

  • The instrument cluster may display “Ultrasonic Sensor Malfunction.”
  • B1B36 may be stored after front and/or rear ultrasonic sensor replacement during body or paint repair.

6. Possible causes

  • The verified communication associates this condition with replacement of front and/or rear ultrasonic sensors during body or paint repair.
  • Further root causes are 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 the warning began after body repair, paint repair, or ultrasonic sensor replacement.
  • Have a Mazda-qualified service facility diagnose the stored DTC and ultrasonic sensor system.
  • Do not assume the code identifies a failed sensor; the supplied evidence identifies a circuit-malfunction code and a repair-related context only.

10. Step-by-step troubleshooting

  1. Confirm the exact stored suffix: B1B36:04 indicates the right-hand front corner ultrasonic sensor signal circuit, while B1B36:49 indicates its power supply circuit.
  2. Confirm whether front and/or rear ultrasonic sensors were replaced during body or paint repair.
  3. Further diagnostic steps are not yet established by verified evidence.

11. When to contact service

Contact a Mazda dealer or qualified repair facility, particularly if the warning appeared after body work, paint work, or ultrasonic sensor replacement.

12. What the service center may check

  • Retrieve and document the complete DTC, including the :04 or :49 suffix.
  • Review prior body, paint, and ultrasonic sensor replacement work.
  • Diagnose the right-hand front corner ultrasonic sensor circuit according to Mazda service information.

13. Possible repair or resolution

  • The supplied evidence does not establish a specific repair resolution.

14. Affected vehicles

15. Related TSBs / service bulletins

  • Mazda service communication 09-026-23, published June 28, 2023, NHTSA Manufacturer Communication PDF 10238672. It documents “Ultrasonic Sensor Malfunction” and listed ultrasonic-sensor DTCs after sensor replacement during body or paint repair.

16. Recall information

  • No recall information was supplied in the verified evidence.

17. Official manufacturer information

Verified source: NHTSA Manufacturer Communication PDF 10238672, Mazda 09-026-23 (June 28, 2023): https://static.nhtsa.gov/odi/tsbs/2023/MC-10238672-0001.pdf

19. Frequently asked questions

What does Mazda code B1B36 mean?

The supplied Mazda communication identifies B1B36:04 as a front right-hand corner ultrasonic sensor signal-circuit malfunction and B1B36:49 as a front right-hand corner ultrasonic sensor power-supply-circuit malfunction.

Which vehicle is covered by the supplied evidence?

The supplied applicability evidence covers the 2022 Mazda MX-30 in the United States.

Can body or paint work be relevant to B1B36?

Yes. The verified communication describes this warning and listed DTCs as occurring after replacement of front and/or rear ultrasonic sensors during body or paint repair.

Is there a verified repair procedure in the supplied evidence?

No. A specific repair procedure is not established by the supplied evidence.

20. Sources & verification

Verified
Mazda B1B36: 04 Front corner ultrasonic sensor (RH) signal circuit… | EV Diagnostics