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Cadillac U2A90

In some cases, these DTC's will not be set. Cause This condition may be caused if the VIN or mileage fai

DriveUnknown. The supplied diagnostic record lists safe-to-drive status as unknown.
ChargeUnknown. The supplied diagnostic record lists safe-to-charge status as unknown.
ServiceContact a Cadillac dealer or qualified service facility for evaluation. Service-required status is otherwise unknown in the supplied diagnostic record.
Confidence95%

Quick answer

For certain 2023–2025 Cadillac LYRIQ vehicles in the US, DTC U2A90 is referenced in Cadillac bulletin PIT5851F as a possible current code associated with a display showing zero miles or incorrect mileage. The supplied evidence does not establish a complete code definition, diagnostic procedure, or repair.

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 U2A90 mean?

For certain 2023–2025 Cadillac LYRIQ vehicles in the US, DTC U2A90 is referenced in Cadillac bulletin PIT5851F as a possible current code associated with a display showing zero miles or incorrect mileage. The supplied evidence does not establish a complete code definition, diagnostic procedure, or repair.

2. Technical explanation

NHTSA-hosted manufacturer communication PIT5851F, published April 4, 2025, identifies U2A90 among DTCs that may accompany a condition in which the vehicle display shows zero miles or incorrect mileage. The bulletin also states that, in some cases, these DTCs will not be set. The supplied excerpt begins to describe a cause involving VIN or mileage failure, but the complete cause statement is not provided in the verified evidence.

3. What system is affected?

Not yet established by verified evidence. The verified communication concerns VIN or mileage information and a display of zero or incorrect mileage.

4. How serious is this code?

Unknown. The diagnostic record lists severity as unknown.

5. Symptoms you may notice

  • Vehicle display may show zero miles.
  • Vehicle display may show incorrect mileage.
  • U2A90 may be current when this condition is present.
  • The listed DTCs may not be set in some cases.

6. Possible causes

  • The verified bulletin excerpt states that the condition may be caused if VIN or mileage information fails, but the remainder of the cause statement is not available in the supplied evidence.
  • No further cause has been established by verified evidence.

7. Can I still drive the vehicle?

Unknown. The supplied diagnostic record lists safe-to-drive status as unknown.

8. Can I charge the vehicle?

Unknown. The supplied diagnostic record lists safe-to-charge status as unknown.

9. What you can safely do

  • Record the displayed mileage and any current diagnostic codes for service evaluation.
  • Use the vehicle identification number to confirm whether PIT5851F applies to the vehicle.
  • Arrange Cadillac service evaluation if the display shows zero or incorrect mileage or U2A90 is present.

10. Step-by-step troubleshooting

  1. Confirm the vehicle is a US-market 2023–2025 Cadillac LYRIQ.
  2. Check whether the display shows zero miles or incorrect mileage.
  3. Have a qualified service facility check for current U2A90 and the other codes identified in PIT5851F.
  4. No further troubleshooting procedure is established by the supplied verified evidence.

11. When to contact service

Contact a Cadillac dealer or qualified service facility for evaluation. Service-required status is otherwise unknown in the supplied diagnostic record.

12. What the service center may check

  • Verify VIN and mileage information as relevant to the condition described in PIT5851F.
  • Check for current U2A90.
  • Check for the other DTCs listed in the verified bulletin: U1973, U197E, U197F, U2A91, and U1978.
  • Evaluate the zero-mile or incorrect-mileage display condition using the complete manufacturer bulletin and service information.

13. Possible repair or resolution

  • Not yet established by verified evidence. The supplied bulletin excerpt does not include a repair procedure or confirmed resolution.

14. Affected vehicles

15. Related TSBs / service bulletins

  • PIT5851F — NHTSA Manufacturer Communication PDF 11016674, published April 4, 2025. It applies in the supplied applicability data to 2023–2025 Cadillac LYRIQ vehicles in the US and references U2A90 in connection with zero or incorrect displayed mileage.

16. Recall information

  • No recall information is provided in the supplied verified evidence.

17. Official manufacturer information

Official source: NHTSA Manufacturer Communication PDF 11016674, Cadillac PIT5851F: https://static.nhtsa.gov/odi/tsbs/2025/MC-11016674-0001.pdf

19. Frequently asked questions

What does U2A90 mean on a Cadillac LYRIQ?

The supplied verified evidence does not provide a complete standalone definition. It identifies U2A90 as a possible current DTC associated with a display showing zero or incorrect mileage.

Which vehicles are covered by the supplied evidence?

The supplied applicability data identifies US-market 2023–2025 Cadillac LYRIQ vehicles.

Will U2A90 always be present with the mileage-display condition?

No. PIT5851F states that, in some cases, the referenced DTCs will not be set.

Is it safe to drive or charge with U2A90?

Not yet established by verified evidence. Both safe-to-drive and safe-to-charge status are listed as unknown.

20. Sources & verification

Verified
Cadillac U2A90: In some cases, these DTC's will not be set. Cause This… | EV Diagnostics