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Cadillac U1610

Conta

DriveNot yet established by verified evidence. Do not rely on this page to determine driveability. If there is a hard or soft brake pedal, or a brake-system communication concern, arrange professional assessment before continued driving.
ChargeNot yet established by verified evidence.
ServiceContact a Cadillac dealer or qualified service facility promptly, especially if brake-pedal feel is hard or soft or if the Brake System Control Module cannot be communicated with.
Confidence95%

Quick answer

For the applicable Cadillac vehicles, U1610 is documented in official manufacturer communications as a communication-related DTC. Verified evidence does not establish a complete code definition beyond the supplied canonical meaning, “Conta.” It has been reported with loss-of-communication conditions involving CAN Bus 2 and, in a separate bulletin, no communication with the Brake System Control Module.

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 U1610 mean?

For the applicable Cadillac vehicles, U1610 is documented in official manufacturer communications as a communication-related DTC. Verified evidence does not establish a complete code definition beyond the supplied canonical meaning, “Conta.” It has been reported with loss-of-communication conditions involving CAN Bus 2 and, in a separate bulletin, no communication with the Brake System Control Module.

2. Technical explanation

Official Cadillac manufacturer communications submitted to NHTSA identify U1610 among loss-of-communication DTCs. PIT6503 through PIT6503C describe cases in which the K56 Serial Data Gateway Module also sets communication-loss DTCs against other ECUs on CAN Bus 2, including U1610. When the entire bus is affected and multiple ECUs have communication loss, the bulletin directs technicians to diagnose the CAN Bus 2 issue and not replace the front camera solely for this condition. A separate communication, PIC6483A, states that U1610 and/or U1639 may be set with no communication to the Brake System Control Module. The supplied evidence does not establish the precise component named by U1610, a single root cause, or a universal repair.

3. What system is affected?

Verified evidence associates U1610 with vehicle serial-data communications, specifically CAN Bus 2 in PIT6503-series communications. PIC6483A also associates it with no communication to the Brake System Control Module. A definitive affected-system name is not yet established by verified evidence.

4. How serious is this code?

Unknown. The diagnostic record does not provide a severity rating. Because verified evidence includes a condition involving no communication with the Brake System Control Module, prompt professional diagnosis is appropriate.

5. Symptoms you may notice

  • U1610 may be stored with other loss-of-communication DTCs affecting multiple ECUs on CAN Bus 2.
  • No communication with the Brake System Control Module may be present when U1610 and/or U1639 are set.
  • PIC6483A reports that drivers may comment on either a hard or soft brake pedal in the condition covered by that bulletin.
  • PIC6483A reports no warning chime in the condition covered by that bulletin.

6. Possible causes

  • A CAN Bus 2 issue is identified for diagnosis when the entire bus is impacted and multiple ECUs have communication loss.
  • The underlying cause described by PIC6483A is under investigation in the supplied evidence.
  • Any more specific wiring, module, power, ground, software, or connector cause is not yet established by verified evidence.

7. Can I still drive the vehicle?

Not yet established by verified evidence. Do not rely on this page to determine driveability. If there is a hard or soft brake pedal, or a brake-system communication concern, arrange professional assessment before continued driving.

8. Can I charge the vehicle?

Not yet established by verified evidence.

9. What you can safely do

  • Have the vehicle scanned and evaluated by a qualified Cadillac service facility or technician.
  • Report whether multiple communication DTCs are present and whether communication with the Brake System Control Module is unavailable.
  • If brake-pedal feel is hard or soft, do not use that vehicle condition as normal; seek professional assessment.
  • Do not replace the front camera based solely on a whole-CAN-Bus-2 communication-loss condition described in PIT6503-series communications.

10. Step-by-step troubleshooting

  1. Confirm whether U1610 is accompanied by multiple ECU communication-loss DTCs on CAN Bus 2.
  2. Determine whether the K56 Serial Data Gateway Module is also setting communication-loss DTCs, as described in PIT6503-series communications.
  3. If the entire bus is affected, diagnose the CAN Bus 2 issue rather than replacing the front camera, consistent with PIT6503-series guidance.
  4. Determine whether there is communication with the Brake System Control Module, as identified in PIC6483A.
  5. Further diagnostic steps are not yet established by verified evidence.

11. When to contact service

Contact a Cadillac dealer or qualified service facility promptly, especially if brake-pedal feel is hard or soft or if the Brake System Control Module cannot be communicated with.

12. What the service center may check

  • Check for multiple ECU loss-of-communication DTCs on CAN Bus 2.
  • Check whether the K56 Serial Data Gateway Module is setting communication-loss DTCs.
  • Check whether the entire CAN Bus 2 network is impacted.
  • Check communication with the Brake System Control Module.
  • Follow the applicable Cadillac manufacturer communication rather than replacing the front camera solely because of the communication-loss pattern.

13. Possible repair or resolution

  • PIT6503-series communications state that the front camera should not be replaced when the entire CAN Bus 2 is impacted with multiple ECU communication losses; diagnose the CAN Bus 2 issue instead.
  • PIC6483A lists the cause as under investigation in the supplied evidence.
  • A final repair or resolution is not yet established by verified evidence.

14. Affected vehicles

15. Related TSBs / service bulletins

  • PIT6503, NHTSA manufacturer communication MC-11031514, published April 14, 2026: U1610 is listed among communication-loss DTCs on CAN Bus 2; for an entire-bus condition, diagnose CAN Bus 2 and do not replace the front camera.
  • PIT6503A, NHTSA manufacturer communication MC-11033726, published June 3, 2026: revision of the CAN Bus 2 communication-loss guidance.
  • PIT6503B, NHTSA manufacturer communication MC-11034014, published June 17, 2026: revision of the CAN Bus 2 communication-loss guidance.
  • PIT6503C, NHTSA manufacturer communication MC-11036219, published August 12, 2026: revision of the CAN Bus 2 communication-loss guidance.
  • PIC6483A, NHTSA manufacturer communication MC-10251686, published February 7, 2024: U1610 and/or U1639 may be set with no communication to the Brake System Control Module; the cause is under investigation.

16. Recall information

  • No recall information was supplied in the verified evidence.

17. Official manufacturer information

Applicable verified-coverage entries are Cadillac CELESTIQ model years 2024–2026, Cadillac LYRIQ model years 2023–2026, Cadillac OPTIQ model years 2024–2026, and Cadillac VISTIQ model years 2024–2026 in the United States. Bulletin applicability and repair eligibility should be confirmed by VIN with Cadillac. Official NHTSA-hosted communications: https://static.nhtsa.gov/odi/tsbs/2026/MC-11036219-0001.pdf and https://static.nhtsa.gov/odi/tsbs/2024/MC-10251686-9999.pdf

19. Frequently asked questions

What does U1610 mean on an applicable Cadillac?

The supplied diagnostic record gives the canonical meaning as “Conta.” Official communications establish that U1610 is used in communication-loss contexts, but do not establish a fuller code definition in the supplied evidence.

Is U1610 related to CAN Bus 2?

It can be. PIT6503-series communications list U1610 among communication-loss DTCs that may be set with other ECU communication losses on CAN Bus 2.

Should the front camera be replaced?

Not for the entire-CAN-Bus-2, multiple-ECU communication-loss condition described in PIT6503-series communications. Those bulletins direct diagnosis of the CAN Bus 2 issue and state not to replace the front camera.

Can U1610 involve the brake system?

PIC6483A states that U1610 and/or U1639 may be set when there is no communication with the Brake System Control Module.

Is it safe to drive or charge with U1610?

Neither driveability nor charging safety is established by the supplied verified evidence. Professional assessment is appropriate, particularly if brake-pedal feel is abnormal or Brake System Control Module communication is unavailable.

20. Sources & verification

Verified
Cadillac U1610: Conta | EV Diagnostics