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Cadillac U2107

Cannot relearn TPM • Specific to Hybrids: – Reduced propulsion power message. – Service high voltage charging system message. Cause If nothing else can be identified as the root ca

DriveUnknown. The supplied evidence does not establish whether the vehicle is safe to drive with U2107. If steering assist is erratic or a Reduced Propulsion Power message is present, seek qualified service promptly.
ChargeUnknown. The supplied evidence lists a Service High Voltage Charging System message for hybrids but does not establish whether charging is safe or whether U2107 itself prevents charging.
ServiceContact a Cadillac dealer or qualified service facility for diagnosis, particularly if steering assist is erratic or hybrid warning messages are displayed.
Confidence95%

Quick answer

For the supplied Cadillac records, DTC U2107 is identified as “Cannot relearn TPM.” Official GM manufacturer communications also list it among codes potentially associated with erratic electric power-steering boost. For hybrids, the communications list possible “Reduced Propulsion Power” and “Service High Voltage Charging System” messages. The supplied evidence does not establish a single vehicle-specific root cause 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 U2107 mean?

For the supplied Cadillac records, DTC U2107 is identified as “Cannot relearn TPM.” Official GM manufacturer communications also list it among codes potentially associated with erratic electric power-steering boost. For hybrids, the communications list possible “Reduced Propulsion Power” and “Service High Voltage Charging System” messages. The supplied evidence does not establish a single vehicle-specific root cause or repair.

2. Technical explanation

The verified diagnostic title/meaning for U2107 is “Cannot relearn TPM.” The supplied official NHTSA-hosted GM manufacturer communications describe a broad set of possible concerns and state that normal SI diagnostics should be used to identify the root cause. Those communications list U2107 among codes potentially associated with erratic electric power-steering boost. They also list an illuminated Service Tire Pressure Monitoring (TPM) warning and inability to relearn TPM. For hybrids, they list possible Reduced Propulsion Power and Service High Voltage Charging System messages. The evidence does not prove that every listed symptom occurs with U2107, nor does it establish that U2107 alone identifies a high-voltage charging fault.

3. What system is affected?

Tire Pressure Monitoring (TPM) relearn function. The official communication also associates U2107 with possible erratic electric power-steering boost; hybrid-specific messages are listed in the communication, but a direct system-level fault attribution is not established by the supplied evidence.

4. How serious is this code?

Unknown. The supplied diagnostic record does not assign a severity.

5. Symptoms you may notice

  • Service Tire Pressure Monitoring (TPM) system light illuminated.
  • Cannot relearn TPM.
  • Erratic electric power-steering boost, potentially associated with U2107.
  • For hybrids: Reduced Propulsion Power message.
  • For hybrids: Service High Voltage Charging System message.

6. Possible causes

  • Not yet established by verified evidence. The official manufacturer communications state that if no other root cause is identified after normal SI diagnostics, further guidance in the communication should be considered; the supplied excerpt does not provide the complete cause or corrective procedure.

7. Can I still drive the vehicle?

Unknown. The supplied evidence does not establish whether the vehicle is safe to drive with U2107. If steering assist is erratic or a Reduced Propulsion Power message is present, seek qualified service promptly.

8. Can I charge the vehicle?

Unknown. The supplied evidence lists a Service High Voltage Charging System message for hybrids but does not establish whether charging is safe or whether U2107 itself prevents charging.

9. What you can safely do

  • Record all active warning messages and whether a TPM relearn attempt fails.
  • Arrange diagnosis using the manufacturer’s normal SI diagnostic procedures.
  • Do not perform high-voltage system repair or testing yourself.

10. Step-by-step troubleshooting

  1. Have a qualified service facility perform normal SI diagnostics, as referenced by the official manufacturer communication.
  2. Confirm whether the issue is limited to TPM relearn or is accompanied by steering-assist behavior, Reduced Propulsion Power, or Service High Voltage Charging System messages.
  3. Check for all stored diagnostic trouble codes; the communication lists U2107 among potentially associated codes but does not establish a complete code set for every vehicle.

11. When to contact service

Contact a Cadillac dealer or qualified service facility for diagnosis, particularly if steering assist is erratic or hybrid warning messages are displayed.

12. What the service center may check

  • Perform the manufacturer’s normal SI diagnostics to identify the actual root cause.
  • Assess the failed TPM relearn concern and any illuminated TPM warning.
  • Evaluate any reported erratic electric power-steering boost.
  • For hybrid vehicles displaying relevant messages, evaluate the Reduced Propulsion Power and Service High Voltage Charging System warnings using manufacturer procedures.

13. Possible repair or resolution

  • Not yet established by verified evidence. The supplied evidence does not provide a confirmed repair for U2107.

14. Affected vehicles

15. Related TSBs / service bulletins

  • GM manufacturer communication 13-08-116-001I, published June 29, 2023; NHTSA document MC-10239102-0001: https://static.nhtsa.gov/odi/tsbs/2023/MC-10239102-0001.pdf
  • GM manufacturer communication 13-08-116-001H, published September 16, 2022; NHTSA document MC-10222776-0001: https://static.nhtsa.gov/odi/tsbs/2022/MC-10222776-0001.pdf
  • GM manufacturer communication 1308116001G, published January 4, 2022; NHTSA document MC-10213767-9999: https://static.nhtsa.gov/odi/tsbs/2022/MC-10213767-9999.pdf
  • GM manufacturer communication 1308116001F, published October 23, 2020; NHTSA document MC-10183782-9999: https://static.nhtsa.gov/odi/tsbs/2020/MC-10183782-9999.pdf
  • GM manufacturer communication 1308116001E, published June 26, 2019; NHTSA document MC-10163272-9999: https://static.nhtsa.gov/odi/tsbs/2019/MC-10163272-9999.pdf
  • GM manufacturer communication 13-08-116-001C, published August 30, 2017; NHTSA document MC-10140298-9999: https://static.nhtsa.gov/odi/tsbs/2017/MC-10140298-9999.pdf

16. Recall information

  • Not yet established by verified evidence. No recall information was supplied.

17. Official manufacturer information

Verified applicability supplied: Cadillac CT6, model years 2014–2023 and 2014–2018; Cadillac ELR, model years 2014–2016, 2014–2018, and 2014–2023; and Cadillac LYRIQ, model years 2014–2023, all for the US region. These overlapping ranges are reported as supplied and do not establish applicability to every individual vehicle. Official source: NHTSA-hosted GM manufacturer communications listed above.

19. Frequently asked questions

What does Cadillac U2107 mean?

The supplied diagnostic record identifies U2107 as “Cannot relearn TPM.”

Can U2107 affect electric power steering?

The official manufacturer communication lists erratic electric power-steering boost as potentially associated with U2107, along with U2109, U2100, B1325, and C0000. It does not establish that U2107 alone is the cause.

Does U2107 mean there is a high-voltage charging system failure?

Not necessarily. The official communication lists Service High Voltage Charging System messages as hybrid-specific possible symptoms, but the supplied evidence does not establish that U2107 alone diagnoses a high-voltage charging fault.

Is there a verified repair for U2107?

Not yet established by verified evidence. The supplied communication directs use of normal SI diagnostics to identify the root cause.

20. Sources & verification

Verified
Cadillac U2107: Cannot relearn TPM • Specific to Hybrids: – Reduced… | EV Diagnostics