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Jeep U0420

Invalid Data Received From Power Steering Control Module set by CADM2

DriveNot yet established by verified evidence.
ChargeNot yet established by verified evidence.
ServiceService is appropriate because official Jeep manufacturer communications provide diagnostic/service guidance for this DTC on applicable vehicles. Driving urgency is not established by the supplied evidence.
Confidence95%

Quick answer

U0420-00 on the listed Jeep Wagoneer vehicles means CADM2 received invalid data from the Power Steering Control Module. Official manufacturer communications associate it with EPS/steering warnings and, in some cases, MIL illumination.

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 U0420 mean?

U0420-00 on the listed Jeep Wagoneer vehicles means CADM2 received invalid data from the Power Steering Control Module. Official manufacturer communications associate it with EPS/steering warnings and, in some cases, MIL illumination.

2. Technical explanation

The verified diagnostic definition is: “Invalid Data Received From Power Steering Control Module set by CADM2.” This is a communication/data-validity DTC involving information received from the Power Steering Control Module. Verified evidence does not establish a specific failed component or root cause.

3. What system is affected?

Power steering / Electric Power Steering (EPS) communication, with the DTC set by CADM2.

4. How serious is this code?

Not yet established by verified evidence.

5. Symptoms you may notice

  • EPS warning on the instrument cluster is documented in official manufacturer communications.
  • Steering warnings on the cluster are documented in an official manufacturer communication.
  • MIL illumination is documented in official manufacturer communications.

6. Possible causes

  • Not yet established by verified evidence. The supplied official communications identify the DTC and associated warnings but do not establish a specific root cause in the provided 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 an authorized Jeep service facility or qualified technician.
  • Provide the exact DTC, U0420-00, and note any EPS, steering, or MIL warnings observed.
  • Do not attempt high-voltage or steering-system repair procedures based on this information.

10. Step-by-step troubleshooting

  1. Have a technician confirm U0420-00 and check for accompanying DTCs using the applicable Jeep diagnostic process.
  2. Use the applicable official manufacturer communications referenced below for model-year-specific service direction. Further diagnostic steps are not established by the supplied evidence.

11. When to contact service

Service is appropriate because official Jeep manufacturer communications provide diagnostic/service guidance for this DTC on applicable vehicles. Driving urgency is not established by the supplied evidence.

12. What the service center may check

  • Confirm whether U0420-00 is present.
  • Check whether C2217-00 and/or C221F-00 are also present, as these codes are listed with U0420-00 in the supplied official communications.
  • For model year 2024, official communication 9100596 directs technicians to 08-095-25 REV. B when the listed DTCs are observed.
  • For model year 2025, official communication 9100596 directs technicians to 08-094-25 REV. A when the listed DTCs are observed.

13. Possible repair or resolution

  • Not yet established by verified evidence. The supplied evidence references official service communications and a steering-rack-related communication, but it does not provide enough verified repair procedure detail to state a repair resolution.

14. Affected vehicles

15. Related TSBs / service bulletins

  • NHTSA Manufacturer Communication 11018679: 08-095-25 REV. B, published 2025-05-21. It lists U0420-00 and applies to the referenced MY2024 service direction. https://static.nhtsa.gov/odi/ffdd/tsbs/TSBS_RECEIVED_2025-2026.zip#nhtsa_id=11018679
  • NHTSA Manufacturer Communication 11018678: 08-094-25 REV. A, published 2025-05-21. It lists U0420-00 and applies to the referenced MY2025 service direction. https://static.nhtsa.gov/odi/ffdd/tsbs/TSBS_RECEIVED_2025-2026.zip#nhtsa_id=11018678
  • NHTSA Manufacturer Communication 11019439: 9100596 Gear Assy - Steering Rack, published 2025-06-02. It directs technicians to 08-095-25 REV. B for MY2024 and 08-094-25 REV. A for MY2025 when listed DTCs, including U0420-00, are observed. https://static.nhtsa.gov/odi/ffdd/tsbs/TSBS_RECEIVED_2025-2026.zip#nhtsa_id=11019439
  • NHTSA Manufacturer Communication S2523000053, revisions A through C, lists U0420-00 with an EPS warning on the cluster. Supplied NHTSA records include 11019449, 11021040, 11035196, and 11036178.

16. Recall information

  • Not yet established by verified evidence.

17. Official manufacturer information

Verified applicability: 2024-2025 Jeep Wagoneer, United States. The supplied sources are official NHTSA-hosted manufacturer communications. Applicability beyond the listed model years, model, and region is not established by verified evidence.

19. Frequently asked questions

What does U0420-00 mean on a Jeep Wagoneer?

It means CADM2 received invalid data from the Power Steering Control Module.

Can U0420-00 be associated with a steering warning?

Yes. Official manufacturer communications document EPS or steering warnings on the cluster with U0420-00.

Does U0420-00 mean the steering rack must be replaced?

Not yet established by verified evidence. A steering-rack-related manufacturer communication references this DTC, but the supplied evidence does not establish replacement as the required repair.

Is it safe to drive or charge with U0420-00?

Not yet established by verified evidence.

20. Sources & verification

ReferenceVerified
Jeep U0420: Invalid Data Received From Power Steering Control Module… | EV Diagnostics