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Chevrolet U2100

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

DriveNot yet established by verified evidence. If electric power-steering boost is erratic or a reduced-propulsion-power message is present, obtain vehicle-specific professional assessment.
ChargeNot yet established by verified evidence. A “Service high voltage charging system” message is listed as a hybrid-specific condition in the supplied bulletin, but no charging instruction or safety determination is provided.
ServiceService evaluation is appropriate because the supplied bulletin directs use of normal SI diagnostics and lists potential steering, TPM, and hybrid warning conditions. Seek prompt service if steering assist is erratic or hybrid warning messages are displayed.
Confidence95%

Quick answer

For Chevrolet vehicles within the supplied US applicability records, DTC U2100 is identified as “Cannot relearn TPM.” Official GM/NHTSA communications also list it among codes that may appear with erratic electric power-steering boost. The bulletin separately lists reduced propulsion power and “Service high voltage charging system” messages as hybrid-specific possible conditions. A vehicle-specific diagnosis is required; driving and charging safety are not established by the supplied evidence.

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 U2100 mean?

For Chevrolet vehicles within the supplied US applicability records, DTC U2100 is identified as “Cannot relearn TPM.” Official GM/NHTSA communications also list it among codes that may appear with erratic electric power-steering boost. The bulletin separately lists reduced propulsion power and “Service high voltage charging system” messages as hybrid-specific possible conditions. A vehicle-specific diagnosis is required; driving and charging safety are not established by the supplied evidence.

2. Technical explanation

The supplied diagnostic record identifies U2100 as “Cannot relearn TPM.” The official GM communications (13-08-116-001, revisions C through I) list U2100 among codes potentially associated with erratic electric power-steering boost, together with U2109, U2107, B1325, and C0000. The same communications list a Service Tire Pressure Monitoring system lamp with an inability to relearn TPM. For hybrids, they also list a reduced-propulsion-power message and a “Service high voltage charging system” message. The supplied excerpt says normal SI diagnostics should be performed first; it does not establish a single root cause or repair for U2100.

3. What system is affected?

Tire Pressure Monitoring (TPM) relearn function. The supplied official bulletin also associates U2100 with possible erratic electric power-steering boost. Hybrid-related warning messages are listed in the bulletin, but the affected subsystem for an individual vehicle is not established by the supplied evidence.

4. How serious is this code?

Unknown. The supplied evidence does not assign a severity level to U2100.

5. Symptoms you may notice

  • Service Tire Pressure Monitoring system light illuminated.
  • Cannot relearn TPM.
  • Erratic electric power-steering boost may be associated with U2100.
  • For hybrids: reduced propulsion power message.
  • For hybrids: “Service high voltage charging system” message.

6. Possible causes

  • Not yet established by verified evidence. The supplied official bulletin states that normal SI diagnostics should be performed first and refers to checking for an issue if no other root cause is identified, but the supplied excerpt does not identify that issue.

7. Can I still drive the vehicle?

Not yet established by verified evidence. If electric power-steering boost is erratic or a reduced-propulsion-power message is present, obtain vehicle-specific professional assessment.

8. Can I charge the vehicle?

Not yet established by verified evidence. A “Service high voltage charging system” message is listed as a hybrid-specific condition in the supplied bulletin, but no charging instruction or safety determination is provided.

9. What you can safely do

  • Record all displayed messages and warning lamps.
  • Have all stored diagnostic trouble codes read and documented.
  • Use the manufacturer’s normal Service Information diagnostic process.
  • Do not attempt high-voltage-system repair.

10. Step-by-step troubleshooting

  1. Perform normal SI diagnostics first, as directed by the supplied GM bulletin.
  2. Confirm whether the TPM system lamp is illuminated and whether TPM relearn fails.
  3. Document whether erratic electric power-steering boost is present.
  4. For hybrids, document whether reduced propulsion power or “Service high voltage charging system” is displayed.
  5. Not yet established by verified evidence: further specific diagnostic steps.

11. When to contact service

Service evaluation is appropriate because the supplied bulletin directs use of normal SI diagnostics and lists potential steering, TPM, and hybrid warning conditions. Seek prompt service if steering assist is erratic or hybrid warning messages are displayed.

12. What the service center may check

  • Read and record all DTCs, including U2100 and any accompanying codes.
  • Perform the manufacturer’s normal SI diagnostics.
  • Check the reported TPM relearn concern and TPM warning-lamp status.
  • Assess any reported erratic electric power-steering boost.
  • For hybrids, assess any reduced-propulsion-power or high-voltage-charging-system message.

13. Possible repair or resolution

  • Not yet established by verified evidence. The supplied evidence does not provide a confirmed repair or parts replacement for U2100.

14. Affected vehicles

15. Related TSBs / service bulletins

  • GM bulletin 13-08-116-001I, published through NHTSA as MC-10239102-0001 on 2023-06-29.
  • Earlier supplied revisions: 13-08-116-001H (MC-10222776-0001), 1308116001G (MC-10213767-9999), 1308116001F (MC-10183782-9999), 1308116001E (MC-10163272-9999), and 13-08-116-001C (MC-10140298-9999).
  • The supplied bulletins list U2100 in connection with possible erratic electric power-steering boost and list TPM, hybrid reduced-propulsion, and high-voltage-charging messages among possible conditions.

16. Recall information

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

17. Official manufacturer information

Official source: NHTSA-hosted GM Manufacturer Communication 13-08-116-001I: https://static.nhtsa.gov/odi/tsbs/2023/MC-10239102-0001.pdf

19. Frequently asked questions

What does Chevrolet U2100 mean?

The supplied diagnostic record defines it as “Cannot relearn TPM.”

Can U2100 be related to power steering?

The supplied GM bulletin lists U2100 among codes potentially associated with erratic electric power-steering boost.

Can U2100 appear with hybrid warnings?

The supplied bulletin lists reduced propulsion power and “Service high voltage charging system” as hybrid-specific possible conditions. It does not establish that U2100 alone causes either message on every vehicle.

Is it safe to drive or charge with U2100?

Not yet established by verified evidence. The supplied data provides no driveability or charging-safety classification.

20. Sources & verification

Verified
Chevrolet U2100: Cannot relearn TPM • Specific to Hybrids: – Reduced… | EV Diagnostics