EV Diagnostics
Verified EV diagnostic knowledge page

Chevrolet U0235

- Do not replace the front camera. - Diagnose the CAN Bus 8 issue using SI 5199684. - If a module

DriveNot yet established by verified evidence.
ChargeNot yet established by verified evidence.
ServiceContact an authorized Chevrolet/GM service facility for diagnosis, especially when U0235 appears with other CAN Bus 8 communication DTCs.
Confidence95%

Quick answer

For certain 2024–2026 Chevrolet Blazer and Equinox vehicles in the US, U0235 is referenced in GM bulletin PIT6503B as a loss-of-communication DTC that may occur with other CAN Bus 8 communication DTCs. If the entire CAN Bus 8 is affected, the bulletin says not to replace the B174W Front View Camera module and to diagnose the CAN Bus 8 issue using SI 5199684.

This page separates verified manufacturer/regulator evidence from supporting material. Unsupported causes, repairs or safety conclusions are not guessed.

Video guides

Watch Videos

Relevant videos play here without leaving this diagnostic page.

No sufficiently relevant embeddable video has been accepted for this diagnostic yet.

Videos are supporting material and never override OEM or regulator evidence.

1. What does U0235 mean?

For certain 2024–2026 Chevrolet Blazer and Equinox vehicles in the US, U0235 is referenced in GM bulletin PIT6503B as a loss-of-communication DTC that may occur with other CAN Bus 8 communication DTCs. If the entire CAN Bus 8 is affected, the bulletin says not to replace the B174W Front View Camera module and to diagnose the CAN Bus 8 issue using SI 5199684.

2. Technical explanation

Verified evidence identifies U0235 as one example of loss-of-communication DTCs that the K56 Serial Data Gateway Module may set against ECUs on CAN Bus 8. The cited GM communications list U1126, U1127, U0235, and U1616 as examples. The supplied bulletin evidence specifically directs technicians, when the entire bus is impacted, not to replace the B174W Front View Camera module and to diagnose the CAN Bus 8 issue using SI 5199684. The supplied evidence does not establish the complete text definition of U0235, a specific failed component, or a consumer-level repair procedure.

3. What system is affected?

CAN Bus 8 communication network; the evidence also references the K56 Serial Data Gateway Module and B174W Front View Camera module.

4. How serious is this code?

Not yet established by verified evidence.

5. Symptoms you may notice

  • The K56 Serial Data Gateway Module may set loss-of-communication DTCs against ECUs on CAN Bus 8, including U0235 as an example.
  • Specific driver-visible symptoms are not yet established by verified evidence.

6. Possible causes

  • A CAN Bus 8 issue may be involved when the entire bus is impacted, according to PIT6503B.
  • A specific root cause, failed module, wiring fault, connector condition, or software issue 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 qualified Chevrolet/GM service facility if U0235 is present, particularly if other CAN Bus 8 loss-of-communication DTCs are also stored.
  • Do not assume the B174W Front View Camera module requires replacement when the entire CAN Bus 8 is affected; the bulletin specifically advises against replacing it in that condition.
  • Avoid high-voltage or network repair work unless performed by appropriately trained service personnel.

10. Step-by-step troubleshooting

  1. A technician should determine whether the K56 Serial Data Gateway Module is also setting loss-of-communication DTCs against other ECUs on CAN Bus 8; the bulletin gives U1126, U1127, U0235, and U1616 as examples.
  2. If the entire CAN Bus 8 is impacted, GM bulletin PIT6503B directs diagnosis of the CAN Bus 8 issue using SI 5199684.
  3. Further diagnostic steps contained in SI 5199684 are not included in the supplied verified evidence.

11. When to contact service

Contact an authorized Chevrolet/GM service facility for diagnosis, especially when U0235 appears with other CAN Bus 8 communication DTCs.

12. What the service center may check

  • Check whether the K56 Serial Data Gateway Module has loss-of-communication DTCs against other CAN Bus 8 ECUs.
  • Determine whether the entire CAN Bus 8 is impacted.
  • When the entire bus is impacted, follow SI 5199684 for CAN Bus 8 diagnosis, as directed by PIT6503B.
  • Do not replace the B174W Front View Camera module solely under the entire-bus condition described in the bulletin.

13. Possible repair or resolution

  • The verified bulletin direction is diagnostic rather than a confirmed repair: do not replace the B174W Front View Camera module if the entire CAN Bus 8 is impacted, and diagnose the CAN Bus 8 issue using SI 5199684.
  • The final repair or resolution is not yet established by the supplied verified evidence.

14. Affected vehicles

15. Related TSBs / service bulletins

  • PIT6503B, NHTSA Manufacturer Communication PDF 11034014, published June 17, 2026. It references U0235 among example CAN Bus 8 loss-of-communication DTCs and directs diagnosis using SI 5199684 when the entire bus is impacted.
  • PIT6503A, NHTSA Manufacturer Communication PDF 11033726, published June 3, 2026. The supplied summary provides the same relevant direction for an entire CAN Bus 8 impact.
  • PIT6503, NHTSA Manufacturer Communication PDF 11031514, published April 14, 2026. The supplied summary provides the same relevant direction for an entire CAN Bus 8 impact.

16. Recall information

  • No recall is established by the supplied verified evidence.

17. Official manufacturer information

Official manufacturer communication evidence is available through NHTSA: PIT6503B, https://static.nhtsa.gov/odi/tsbs/2026/MC-11034014-0001.pdf

19. Frequently asked questions

Does U0235 mean the front camera must be replaced?

No, not when the entire CAN Bus 8 is impacted under the condition described in PIT6503B. The bulletin specifically says not to replace the B174W Front View Camera module and instead to diagnose the CAN Bus 8 issue using SI 5199684.

Which vehicles are covered by the supplied applicability data?

The supplied data identifies US-market Chevrolet Blazer model years 2024–2026 and Chevrolet Equinox model years 2024–2026. The Equinox applicability record is also separately listed for 2025–2026.

Is U0235 a confirmed camera fault?

Not according to the supplied evidence. U0235 is listed as an example of a loss-of-communication DTC associated with CAN Bus 8 evaluation. The evidence does not establish the front camera as the failed part.

Can I drive or charge with U0235?

Not yet established by verified evidence.

20. Sources & verification

ReferenceVerified
Chevrolet U0235: - Do not replace the front camera. - Diagnose the CAN… | EV Diagnostics