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Jeep B221D

00 Rain Sensor Module (RSM) Internal, B221D-49 - Rain Sensor Module (RSM) Internal Electronic Failure, B23AA-01 - Implausible Data Received from Rain Sensor - General Electrical Fa

DriveNot yet established by verified evidence.
ChargeNot yet established by verified evidence.
ServiceContact an authorized Jeep dealer or qualified service provider if rain-sensitive wipers and/or automatic headlamps remain inoperative, or if B221D is present.
Confidence95%

Quick answer

B221D is associated with the Rain Sensor Module (RSM) on certain US-market Jeep Grand Cherokee and Wagoneer vehicles. Official manufacturer communications link it to inoperative rain-sensitive wipers and/or automatic headlamps.

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 B221D mean?

B221D is associated with the Rain Sensor Module (RSM) on certain US-market Jeep Grand Cherokee and Wagoneer vehicles. Official manufacturer communications link it to inoperative rain-sensitive wipers and/or automatic headlamps.

2. Technical explanation

Verified Jeep manufacturer communications identify B221D-00 as “Rain Sensor Module (RSM) Internal” and B221D-49 as “Rain Sensor Module (RSM) Internal Electronic Failure.” The same communications also list B23AA-01, “Implausible Data Received from Rain Sensor - General Electrical Failure,” as a related diagnostic observation depending on the vehicle.

3. What system is affected?

Rain Sensor Module (RSM), rain-sensitive wiper function, and automatic headlamp function.

4. How serious is this code?

Not yet established by verified evidence.

5. Symptoms you may notice

  • Rain-sensitive wipers may not function.
  • Automatic headlamps may not function.

6. Possible causes

  • An internal Rain Sensor Module condition is identified by B221D-00.
  • An internal electronic failure of the Rain Sensor Module is identified by B221D-49.
  • Not yet established by verified evidence whether other causes apply.

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

  • Verify that the auto-on wiper selection in the radio settings is set to ON.
  • Verify that the customer-selected headlamp switch position is set for AUTO-ON headlamps.
  • Arrange diagnosis using the applicable Jeep manufacturer service information if the condition remains.

10. Step-by-step troubleshooting

  1. Verify the auto-on wiper selection within the radio settings is ON.
  2. Verify the headlamp switch is positioned for AUTO-ON headlamps.
  3. Inspect the wiper and rain-sensor-related condition according to the applicable Jeep service procedure. Further specific inspection details are not established by the supplied verified evidence.

11. When to contact service

Contact an authorized Jeep dealer or qualified service provider if rain-sensitive wipers and/or automatic headlamps remain inoperative, or if B221D is present.

12. What the service center may check

  • Confirm whether B221D-00 or B221D-49 is stored.
  • Confirm the auto-on wiper setting in the radio settings.
  • Confirm the headlamp switch is set to AUTO-ON.
  • Follow the applicable manufacturer communication and service procedure.

13. Possible repair or resolution

  • The supplied evidence confirms that Jeep published service communication S2308000120 for this condition.
  • A specific repair outcome is not fully established by the supplied verified evidence.

14. Affected vehicles

15. Related TSBs / service bulletins

  • Jeep service communication S2308000120, published through NHTSA as MC-10244419 and MC-10248580 on September 28, 2023.
  • Revisions of S2308000120 were published as MC-11017355 (Rev. C, April 26, 2025), MC-11018444 (Rev. D, May 16, 2025), MC-11027736 (Rev. E, January 16, 2026), and MC-11028744 (Rev. F, February 6, 2026).

16. Recall information

  • Not yet established by verified evidence.

17. Official manufacturer information

NHTSA-hosted Jeep manufacturer communication S2308000120: https://static.nhtsa.gov/odi/tsbs/2026/MC-11028744-0001.pdf

19. Frequently asked questions

What does B221D mean?

Verified Jeep communications define B221D-00 as Rain Sensor Module (RSM) Internal and B221D-49 as Rain Sensor Module (RSM) Internal Electronic Failure.

What functions can be affected?

The verified communications describe rain-sensitive wipers and/or automatic headlamps as inoperative.

What should be checked first?

The communication directs verification that the radio setting for auto-on wipers is ON and that the headlamp switch is set for AUTO-ON headlamps.

Is this a recall?

Not yet established by verified evidence.

20. Sources & verification

Verified
Jeep B221D: 00 Rain Sensor Module (RSM) Internal, B221D-49 - Rain… | EV Diagnostics