EV Diagnostics
Verified EV diagnostic knowledge page

Jeep P0A0A

High Voltage System Interlock Circuit A. P0AA6-00 - Hybrid Battery Voltage System Isolation Fault

DriveNot yet established by verified evidence.
ChargeNot yet established by verified evidence.
ServiceContact a Jeep dealer or qualified service facility, particularly if the vehicle will not start or the check-engine light is illuminated with these DTCs.
Confidence95%

Quick answer

For a 2021 Jeep Wrangler in the U.S., verified NHTSA manufacturer communication 08-131-21 identifies P0A0A-00 (High Voltage System Interlock Circuit A) and P0AA6-00 (Hybrid Battery Voltage System Isolation Fault) as DTCs that may be present when the vehicle does not start and the check-engine light is on.

This page separates verified manufacturer/regulator evidence from supporting material. Unsupported causes, repairs or safety conclusions are not guessed.

Video guides

Watch Videos

Relevant videos play here without leaving this diagnostic page.

No sufficiently relevant embeddable video has been accepted for this diagnostic yet.

Videos are supporting material and never override OEM or regulator evidence.

1. What does P0A0A mean?

For a 2021 Jeep Wrangler in the U.S., verified NHTSA manufacturer communication 08-131-21 identifies P0A0A-00 (High Voltage System Interlock Circuit A) and P0AA6-00 (Hybrid Battery Voltage System Isolation Fault) as DTCs that may be present when the vehicle does not start and the check-engine light is on.

2. Technical explanation

The supplied diagnostic record groups P0A0A with the meaning “High Voltage System Interlock Circuit A” and also references P0AA6-00, “Hybrid Battery Voltage System Isolation Fault.” The verified manufacturer communication does not establish a specific failed component, root cause, diagnostic procedure, or repair from the evidence provided.

3. What system is affected?

High-voltage system interlock circuit; the supplied record also references the hybrid battery voltage isolation system.

4. How serious is this code?

Not yet established by verified evidence.

5. Symptoms you may notice

  • Vehicle may not start.
  • Check-engine light may be on.

6. Possible causes

  • 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

  • Do not attempt high-voltage diagnosis or repair.
  • Arrange professional diagnosis by a qualified Jeep service facility.

10. Step-by-step troubleshooting

  1. Record the exact DTC suffixes shown by the vehicle, including whether P0A0A-00 and/or P0AA6-00 are present.
  2. Have a qualified service facility review NHTSA manufacturer communication 08-131-21 and diagnose the vehicle using applicable manufacturer procedures.

11. When to contact service

Contact a Jeep dealer or qualified service facility, particularly if the vehicle will not start or the check-engine light is illuminated with these DTCs.

12. What the service center may check

  • Confirm the stored DTCs, including P0A0A-00 and P0AA6-00 if present.
  • Review manufacturer communication 08-131-21 for the applicable 2021 U.S. Jeep Wrangler.
  • Further service checks are not established by the supplied verified evidence.

13. Possible repair or resolution

  • Not yet established by verified evidence.

14. Affected vehicles

15. Related TSBs / service bulletins

  • NHTSA Manufacturer Communication 10218554, bulletin 08-131-21, published August 5, 2021. The supplied evidence states that a vehicle may not start and may have a check-engine light on, with P1D72-00, P0A0A-00, and P0AA6-00 potentially present.

16. Recall information

  • Not yet established by verified evidence.

17. Official manufacturer information

Verified applicability: 2021 Jeep Wrangler, United States. Official source: NHTSA Manufacturer Communication 10218554 (08-131-21), published 2021-08-05: https://static.nhtsa.gov/odi/ffdd/tsbs/TSBS_RECEIVED_2020-2024.zip#nhtsa_id=10218554

19. Frequently asked questions

What does P0A0A-00 mean?

The supplied verified record identifies P0A0A-00 as High Voltage System Interlock Circuit A.

What symptoms are verified for this communication?

The communication states that the vehicle may not start and may have a check-engine light on.

Does this information apply to every Jeep?

No. The supplied applicability evidence is limited to the 2021 Jeep Wrangler in the United States.

What repairs are required?

Not yet established by verified evidence.

20. Sources & verification

ReferenceVerified
Jeep P0A0A: High Voltage System Interlock Circuit A. P0AA6-00 - Hybrid… | EV Diagnostics