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Cadillac U1973

In some cases, these DTC's will not be set. Cause This condition may be caused if t

DriveNot yet established by verified evidence.
ChargeNot yet established by verified evidence.
ServiceContact an authorized Cadillac service department if the odometer displays zero or incorrect mileage or if U1973 is current. Provide the VIN, odometer display details, and diagnostic scan results, and ask the dealer to review PIT5851F.
Confidence95%

Quick answer

For 2023–2025 Cadillac LYRIQ vehicles in the US, U1973 is listed in GM/Cadillac bulletin PIT5851F as a possible current DTC associated with an odometer displaying zero or incorrect mileage. The supplied evidence does not establish a complete code definition, driving/charging status, or repair procedure.

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 U1973 mean?

For 2023–2025 Cadillac LYRIQ vehicles in the US, U1973 is listed in GM/Cadillac bulletin PIT5851F as a possible current DTC associated with an odometer displaying zero or incorrect mileage. The supplied evidence does not establish a complete code definition, driving/charging status, or repair procedure.

2. Technical explanation

NHTSA manufacturer communication PIT5851F, published April 4, 2025, identifies U1973 among possible current DTCs that may accompany an odometer display of zero miles or incorrect mileage. The bulletin evidence also states that these DTCs may not be set in some cases. The supplied excerpt begins to describe a cause but does not provide the complete cause statement; therefore, the underlying fault mechanism is not yet established by verified evidence.

3. What system is affected?

Instrument-cluster odometer/mileage display behavior is implicated by the verified bulletin evidence. The specific control module, network, or hardware responsible is not yet established by verified evidence.

4. How serious is this code?

Unknown. The diagnostic record provides an unknown severity, and the supplied bulletin excerpt does not establish a safety severity.

5. Symptoms you may notice

  • Odometer may display zero miles.
  • Odometer may display incorrect mileage.
  • U1973 may be present as a current DTC.
  • The bulletin states that, in some cases, these DTCs may not be set.

6. Possible causes

  • The verified bulletin states that this condition may be caused by a factor described after the supplied excerpt. Because that cause text is incomplete, the cause 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

  • Record the displayed odometer mileage and any observed discrepancy.
  • Record whether U1973 is current and preserve any scan report for a Cadillac service department.
  • Use the vehicle identification number to confirm whether bulletin PIT5851F applies to the individual vehicle.
  • Do not attempt high-voltage or module repair based on this information.

10. Step-by-step troubleshooting

  1. Confirm whether the odometer displays zero or incorrect mileage.
  2. Check for U1973 and the other bulletin-listed DTCs with appropriate diagnostic equipment.
  3. Review Cadillac/GM bulletin PIT5851F using the vehicle VIN and complete bulletin content.
  4. Further diagnostic steps are not yet established by the supplied verified evidence.

11. When to contact service

Contact an authorized Cadillac service department if the odometer displays zero or incorrect mileage or if U1973 is current. Provide the VIN, odometer display details, and diagnostic scan results, and ask the dealer to review PIT5851F.

12. What the service center may check

  • Verify the reported odometer behavior.
  • Check for current U1973 and other DTCs listed in PIT5851F.
  • Confirm vehicle applicability: 2023–2025 Cadillac LYRIQ, US market.
  • Review the full manufacturer bulletin for its complete cause and service direction.

13. Possible repair or resolution

  • A specific repair or resolution is not yet established by the supplied verified evidence.

14. Affected vehicles

15. Related TSBs / service bulletins

  • PIT5851F — NHTSA Manufacturer Communication PDF 11016674, published April 4, 2025. It applies in the supplied data to 2023–2025 Cadillac LYRIQ vehicles in the US and identifies U1973 as one possible current DTC associated with an odometer showing zero or incorrect mileage.

16. Recall information

  • No recall information is supplied or established by the verified evidence.

17. Official manufacturer information

Official source: NHTSA Manufacturer Communication PDF 11016674, Cadillac/GM bulletin PIT5851F, published April 4, 2025: https://static.nhtsa.gov/odi/tsbs/2025/MC-11016674-0001.pdf

19. Frequently asked questions

What does U1973 mean on a Cadillac LYRIQ?

For the applicable 2023–2025 US Cadillac LYRIQ population in PIT5851F, U1973 is listed as a possible current DTC associated with an odometer that may display zero or incorrect mileage. A complete standalone definition is not established by the supplied evidence.

Can U1973 occur without being stored?

The bulletin states that, in some cases, these DTCs will not be set.

Does U1973 mean the vehicle is unsafe to drive or charge?

Not yet established by verified evidence.

Which vehicles are covered by the supplied bulletin evidence?

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

20. Sources & verification

Verified
Cadillac U1973: In some cases, these DTC's will not be set. Cause This… | EV Diagnostics