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Cadillac U1615

to-Bumper coverage (Canada Base Warranty coverage

DriveNot yet established by verified evidence. If active safety features are inoperable, use appropriate caution and arrange professional diagnosis.
ChargeNot yet established by verified evidence.
ServiceContact a Cadillac/GM dealer or qualified service facility if U1615 is Active, if safety features are unavailable, or if the concern persists. Provide the complete scan report, including any accompanying DTCs and whether each code is Active.
Confidence95%

Quick answer

U1615 is listed in verified Cadillac/GM service communications as “Lost Communication with Image Processing Module 1 - Processor 1 on CAN Bus 2” (SYM00). On certain non-Super Cruise vehicles, the wording may instead refer to the B174W front-view camera/windshield module. The supplied database does not establish a single universal cause, driving decision, charging decision, or repair for every vehicle.

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 U1615 mean?

U1615 is listed in verified Cadillac/GM service communications as “Lost Communication with Image Processing Module 1 - Processor 1 on CAN Bus 2” (SYM00). On certain non-Super Cruise vehicles, the wording may instead refer to the B174W front-view camera/windshield module. The supplied database does not establish a single universal cause, driving decision, charging decision, or repair for every vehicle.

2. Technical explanation

The diagnostic record’s canonical title/meaning appears incomplete and refers to warranty wording rather than a technical definition. Verified NHTSA-hosted GM communications identify U1615 SYM00 as a lost-communication DTC involving Image Processing Module 1 - Processor 1 on CAN Bus 2. A 2025 communication states that, for non-Super Cruise vehicles, “Image Processing Module 1 - Processor 1” should be replaced with “B174W Front View Camera - Windshield.” The evidence also shows that U1615 can occur in different service contexts. For certain radio-related cases, GM communications state that U1615 may set because of a software anomaly and instruct dealers not to replace the radio solely for this DTC. Other communications direct technicians to perform a 12-volt disconnect, recheck DTC status, and, if U1615 remains Active, follow SI document 6535776 for diagnosis. These are technician service procedures, not consumer repair instructions.

3. What system is affected?

Verified evidence associates U1615 with communication on CAN Bus 2 involving Image Processing Module 1 - Processor 1. For specified non-Super Cruise vehicles, verified evidence describes the relevant wording as the B174W front-view camera/windshield module. The supplied evidence does not establish the exact affected module configuration for every applicable Cadillac.

4. How serious is this code?

Unknown. The diagnostic record lists severity as unknown. A 2025 GM communication associates U1615 with a condition in which active safety features in its condition statement may be inoperable and persist across key cycles, but this does not establish the seriousness of every U1615 event.

5. Symptoms you may notice

  • A verified 2025 GM communication references a condition where active safety features described in that communication are inoperable and the condition persists across key cycles.
  • No universal driver-visible symptom is established by the supplied evidence.
  • U1615 may be present in radio-related diagnostic contexts; the supplied evidence does not establish that U1615 alone causes a radio symptom.

6. Possible causes

  • A software anomaly is identified in GM radio-related communications as a reason U1615 can set in the listed context.
  • An active lost-communication condition involving Image Processing Module 1 - Processor 1 on CAN Bus 2 is identified by verified service communications.
  • For certain non-Super Cruise vehicles, the communication target naming is B174W front-view camera/windshield module.
  • No single root cause for all Cadillac U1615 occurrences is established by verified evidence.

7. Can I still drive the vehicle?

Not yet established by verified evidence. If active safety features are inoperable, use appropriate caution and arrange professional diagnosis.

8. Can I charge the vehicle?

Not yet established by verified evidence.

9. What you can safely do

  • Record whether U1615 is Active or history/stored, if your scan tool provides that information.
  • Note any active-safety or infotainment concerns and whether they persist across key cycles.
  • Arrange Cadillac/GM dealer or qualified-service diagnosis, particularly if U1615 remains Active or safety features are unavailable.
  • Do not attempt high-voltage system repair based on this code.

10. Step-by-step troubleshooting

  1. GM service communications instruct technicians in certain cases to perform a 12-volt disconnect and recheck DTCs.
  2. If U1615 remains Active after DTC clearing in the cited service procedure, GM directs technicians to SI 6535776 for U1615 diagnosis.
  3. In specified radio-related cases, GM communications state U1615 can be set by a software anomaly and that the radio should not be replaced solely for this DTC.
  4. The supplied evidence does not provide the contents of SI 6535776; further diagnostic steps are not established here.

11. When to contact service

Contact a Cadillac/GM dealer or qualified service facility if U1615 is Active, if safety features are unavailable, or if the concern persists. Provide the complete scan report, including any accompanying DTCs and whether each code is Active.

12. What the service center may check

  • Confirm whether U1615 is Active after the service procedure’s 12-volt disconnect and DTC recheck.
  • When U1615 remains Active, follow GM SI 6535776, as directed by PIT6503D/E.
  • Check for active B1A05 from the B174W Front View Camera module where the PIT6503D/E procedure directs that check.
  • Evaluate whether the vehicle falls within the radio-software-anomaly context before replacing a radio.

13. Possible repair or resolution

  • For the GM radio-related software-anomaly context, verified communications state not to replace the radio solely for U1615.
  • For persistent Active U1615 in the cited safety-feature procedure, GM directs diagnosis through SI 6535776.
  • A definitive component repair or software update for all U1615 cases is not established by the supplied evidence.

14. Affected vehicles

15. Related TSBs / service bulletins

  • PIT6503E, NHTSA manufacturer communication 11036709, published August 27, 2026: directs a 12-volt disconnect/recheck and refers persistent Active U1615 to SI 6535776.
  • PIT6503D, NHTSA manufacturer communication 11036400, published August 21, 2026: same verified U1615 Active-status pathway and B1A05 check context.
  • PIT6393J, NHTSA manufacturer communication 11029962, published March 6, 2026: states listed U1615 occurrences can be due to a software anomaly and says not to replace the radio for the listed DTCs.
  • PIT6457B, NHTSA manufacturer communication 11027686, published January 12, 2026: includes U1615 among listed radio-related DTCs.
  • PIT6393H/F/E/D/C, NHTSA manufacturer communications published during 2025: list U1615 in radio-related software-anomaly guidance.
  • PIC6587B, NHTSA manufacturer communication 11018476, published May 13, 2025: identifies U1615 SYM00 as lost communication with Image Processing Module 1 - Processor 1 on CAN Bus 2 in its active-safety condition context.
  • PIT6313, NHTSA manufacturer communication 11012936, published January 7, 2025: states that on non-Super Cruise vehicles the Image Processing Module 1 wording should be replaced by B174W Front View Camera - Windshield.
  • PIC6500B, NHTSA manufacturer communication 11007683, published September 11, 2024, and PIC6500A, NHTSA manufacturer communication 10237683, published May 24, 2023: include U1615 SYM00 among listed DTCs and advise against controller replacement in the specified condition.

16. Recall information

  • No recall is established by the supplied verified evidence.

17. Official manufacturer information

Applicable vehicle evidence supplied: Cadillac CELESTIQ model years 2023–2026; Cadillac LYRIQ model years 2023–2026; Cadillac OPTIQ model years 2023–2026; and Cadillac VISTIQ model years 2023–2026. All supplied applicability entries are marked US. Overlapping entries do not establish additional applicability beyond those model-year ranges. Source evidence consists of NHTSA-hosted GM manufacturer communications, last verified in the supplied diagnostic record on September 23, 2026.

19. Frequently asked questions

What does U1615 mean?

Verified GM communication evidence identifies U1615 SYM00 as “Lost Communication with Image Processing Module 1 - Processor 1 on CAN Bus 2.” On specified non-Super Cruise vehicles, GM states this wording should be replaced with B174W Front View Camera - Windshield.

Does U1615 mean the radio must be replaced?

No, not in the specific radio-related software-anomaly context covered by PIT6393 communications. Those communications state not to replace the radio for the listed DTCs, including U1615. This does not establish that a radio is unrelated in every case.

Can I keep driving with U1615?

Not yet established by verified evidence. One GM communication relates U1615 to a condition where active safety features may be inoperable, so professional diagnosis is appropriate if those features are unavailable.

Is U1615 a charging or high-voltage fault?

Not yet established by verified evidence. The supplied communications describe a CAN communication issue and do not establish a charging or high-voltage-system fault.

20. Sources & verification

Verified
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Cadillac U1615: to-Bumper coverage (Canada Base Warranty coverage | EV Diagnostics