Subaru B2255
Verify signal strength ≥23%. If ~0%, move the
Quick answer
B2255 is identified in Subaru service-bulletin evidence as indicating a problem between the Data Communication Module (DCM) and the infotainment unit. The supplied evidence also directs verification of signal strength at or above 23%; if it is approximately 0%, the source text is incomplete after “move the.”
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 B2255 mean?
B2255 is identified in Subaru service-bulletin evidence as indicating a problem between the Data Communication Module (DCM) and the infotainment unit. The supplied evidence also directs verification of signal strength at or above 23%; if it is approximately 0%, the source text is incomplete after “move the.”
2. Technical explanation
Verified NHTSA-hosted Subaru manufacturer communications 15-308-23R state that B2255 or B2256 should be considered because these DTCs indicate a problem between the DCM and the infotainment unit. The same evidence says current Telematics DTCs can skew results by delaying DCM power-down. It also states: “Zero Signal: Verify signal strength ≥23%. If ~0%, move the”—but the supplied excerpt does not identify what should be moved or provide further procedure details.
3. What system is affected?
Telematics/Data Communication Module (DCM) and infotainment-unit communication.
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
- A problem between the DCM and the infotainment unit is established by the supplied Subaru bulletin evidence.
- Current telematics DTCs may skew the referenced test results by delaying DCM power-down.
- Any more specific root cause 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
- Arrange diagnosis by a Subaru dealer or qualified service professional using the applicable Subaru procedure.
- Record any accompanying warning messages and diagnostic codes for the service visit.
- Do not attempt high-voltage or module repair based on this information.
10. Step-by-step troubleshooting
- Check for current telematics DTCs, as the bulletin states they can delay DCM power-down and skew results.
- Verify signal strength is at least 23%, as directed by the bulletin.
- If signal strength is approximately 0%, the supplied evidence begins an instruction to “move the” but does not include the object or full instruction; do not infer the missing procedure.
- Evaluate communication between the DCM and infotainment unit using the applicable Subaru service information.
11. When to contact service
Service evaluation is appropriate because verified Subaru bulletin evidence identifies B2255 as a DCM-to-infotainment-unit problem. Urgency is not yet established by verified evidence.
12. What the service center may check
- Scan for current telematics DTCs.
- Assess whether DCM power-down timing could be affected by current telematics DTCs.
- Verify signal strength is at least 23%.
- Diagnose the DCM-to-infotainment-unit connection/problem using the complete applicable Subaru procedure.
13. Possible repair or resolution
- Not yet established by verified evidence. The supplied bulletin excerpts do not provide a completed repair instruction or confirmed repair outcome for B2255.
14. Affected vehicles
- Subaru Crosstrek · 2019–2025 · US
- Subaru Crosstrek · 2019–2026 · US
- Subaru Solterra · 2019–2025 · US
- Subaru Solterra · 2019–2026 · US
- Subaru Trailseeker · 2019–2026 · US
- Subaru Uncharted · 2019–2026 · US
15. Related TSBs / service bulletins
- Subaru manufacturer communication 15-308-23R, hosted by NHTSA as MC-11036807-0001 and published August 20, 2026. It references B2255/B2256 as indicating a DCM-to-infotainment-unit problem and includes the signal-strength verification excerpt.
- Subaru manufacturer communication 15-308-23R, hosted by NHTSA as MC-11024869-0001 and published October 28, 2025. The supplied evidence contains the same relevant B2255/B2256 and signal-strength excerpt.
16. Recall information
No recall relationship is established by verified evidence.
17. Official manufacturer information
Official evidence supplied: NHTSA-hosted Subaru manufacturer communications 15-308-23R: https://static.nhtsa.gov/odi/tsbs/2026/MC-11036807-0001.pdf and https://static.nhtsa.gov/odi/tsbs/2025/MC-11024869-0001.pdf
19. Frequently asked questions
What does Subaru DTC B2255 indicate?
The supplied Subaru bulletin evidence states that B2255 indicates a problem between the DCM and the infotainment unit.
What signal strength does the bulletin specify?
The supplied evidence directs verification of signal strength at or above 23%.
Does B2255 make the vehicle unsafe to drive or charge?
Not yet established by verified evidence.
Which vehicles are listed in the supplied applicability data?
The supplied applicability records list U.S. Subaru Crosstrek (2019–2026 and 2019–2025 entries), Solterra (2019–2026 and 2019–2025 entries), Trailseeker (2019–2026), and Uncharted (2019–2026). The records contain overlapping ranges; exact applicability should be confirmed against the complete Subaru bulletin and vehicle identification information.