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Chevrolet U1611

G111 and/or G112 may not be properly torqued. Correction: Inspect G111 and G112 to confirm t

DriveNot yet established by verified evidence. If the vehicle stalls or will not start, it may not be operable.
ChargeNot yet established by verified evidence.
ServiceContact a Chevrolet dealer or qualified service facility for diagnosis. Prompt service is appropriate if the vehicle stalls, will not start, or has a clicking starter when the Start button is pressed.
Confidence95%

Quick answer

For applicable Chevrolet vehicles, U1611 is identified in a manufacturer communication as a possible accompanying code when G111 and/or G112 ground points may not be properly torqued. The communication directs inspection of G111 and G112 to confirm torque. U1611 is also listed in a separate communication as a loss-of-communication DTC that may be seen with CAN Bus 2 communication concerns.

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 U1611 mean?

For applicable Chevrolet vehicles, U1611 is identified in a manufacturer communication as a possible accompanying code when G111 and/or G112 ground points may not be properly torqued. The communication directs inspection of G111 and G112 to confirm torque. U1611 is also listed in a separate communication as a loss-of-communication DTC that may be seen with CAN Bus 2 communication concerns.

2. Technical explanation

Verified evidence supports two documented contexts for U1611. PIT6282/PIT6282A lists U1611 among DTCs that may be present with a stall or a no-start accompanied by a clicking starter when the Start button is pressed. That communication identifies G111 and/or G112 not being properly torqued as the cause and directs inspection of those locations to confirm torque. Separately, PIT6503/PIT6503A/PIT6503B lists U1611 as an example of a loss-of-communication DTC that may be set by the K56 Serial Data Gateway Module against other ECUs on CAN Bus 2. When multiple ECUs have communication loss and the entire bus is affected, the communication says not to replace the B174W Front View Camera and to diagnose the broader bus concern.

3. What system is affected?

Verified evidence identifies CAN Bus 2 communication and the K56 Serial Data Gateway Module in one U1611 diagnostic context. Another official communication identifies G111 and G112 ground points in a stall/no-start context. A single system name for U1611 is not otherwise established by verified evidence.

4. How serious is this code?

Not yet established by verified evidence.

5. Symptoms you may notice

  • A stall may occur.
  • A no-start with a clicking starter when the Start button is pressed may occur.
  • Multiple ECU loss-of-communication DTCs on CAN Bus 2 may be present.

6. Possible causes

  • G111 and/or G112 may not be properly torqued.
  • A broader CAN Bus 2 communication concern may be present when multiple ECUs have communication loss. Further root cause is not established by the supplied verified evidence.

7. Can I still drive the vehicle?

Not yet established by verified evidence. If the vehicle stalls or will not start, it may not be operable.

8. Can I charge the vehicle?

Not yet established by verified evidence.

9. What you can safely do

  • Arrange qualified Chevrolet service diagnosis if U1611 is stored, particularly if there is a stall, no-start, clicking starter, or multiple communication codes.
  • Do not replace the B174W Front View Camera solely because U1611 is present when multiple ECUs show loss of communication on CAN Bus 2.
  • Do not attempt high-voltage system repairs based on this code.

10. Step-by-step troubleshooting

  1. A qualified technician should inspect G111 and G112 to confirm torque, as directed by PIT6282/PIT6282A.
  2. A qualified technician should check whether the K56 Serial Data Gateway Module is setting loss-of-communication DTCs against other ECUs on CAN Bus 2.
  3. If multiple ECUs have communication loss and the entire bus is affected, diagnose the broader CAN Bus 2 concern rather than replacing the B174W Front View Camera.

11. When to contact service

Contact a Chevrolet dealer or qualified service facility for diagnosis. Prompt service is appropriate if the vehicle stalls, will not start, or has a clicking starter when the Start button is pressed.

12. What the service center may check

  • Inspect G111 and G112 to confirm torque.
  • Check the K56 Serial Data Gateway Module for loss-of-communication DTCs against other ECUs on CAN Bus 2.
  • Determine whether multiple ECUs are affected by communication loss across the bus.
  • Avoid B174W Front View Camera replacement when the entire CAN Bus 2 is impacted, per PIT6503-series guidance.

13. Possible repair or resolution

  • For the stall/no-start context in PIT6282/PIT6282A, the documented correction is to inspect G111 and G112 to confirm torque.
  • For the multiple-module CAN Bus 2 communication context in PIT6503-series guidance, diagnose the bus concern; do not replace the B174W Front View Camera solely for the listed communication-code pattern.

14. Affected vehicles

15. Related TSBs / service bulletins

  • PIT6282, NHTSA manufacturer communication MC-11011192, published November 12, 2024.
  • PIT6282A, NHTSA manufacturer communication MC-11011319, published November 18, 2024.
  • PIT6503, NHTSA manufacturer communication MC-11031514, published April 14, 2026.
  • PIT6503A, NHTSA manufacturer communication MC-11033726, published June 3, 2026.
  • PIT6503B, NHTSA manufacturer communication MC-11034014, published June 17, 2026.

16. Recall information

  • Not yet established by verified evidence.

17. Official manufacturer information

Official NHTSA-hosted manufacturer communications: PIT6282/PIT6282A and PIT6503/PIT6503A/PIT6503B. See the supplied NHTSA document URLs for the full communications.

19. Frequently asked questions

What does Chevrolet U1611 mean?

In the supplied verified evidence, U1611 is listed in a Chevrolet communication involving G111 and/or G112 possibly not being properly torqued, and in separate communications as an example CAN Bus 2 loss-of-communication DTC. The evidence does not establish one universal meaning beyond these documented contexts.

Can U1611 cause a no-start?

PIT6282/PIT6282A states that a stall or no-start with a clicking starter may occur, and U1611 may be present among the listed DTCs. It identifies G111 and/or G112 possibly not being properly torqued as the cause in that communication.

Should the front camera be replaced for U1611?

PIT6503-series guidance says not to replace the B174W Front View Camera when multiple ECUs have loss-of-communication DTCs and the entire CAN Bus 2 is affected.

Is it safe to drive or charge with U1611?

Not yet established by verified evidence.

20. Sources & verification

Verified
Chevrolet U1611: G111 and/or G112 may not be properly torqued.… | EV Diagnostics