Jeep P0AA4
00 - Hybrid Battery Negative Contactor Circuit Stuck Closed. This is a hard fault and will require battery pack replacement. To avoid this from occurring when flashing a module. It
Quick answer
P0AA4-00 is identified in verified Stellantis service evidence as “Hybrid Battery Negative Contactor Circuit Stuck Closed.” The evidence states it is a hard fault that requires high-voltage battery pack replacement when set during module flashing.
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 P0AA4 mean?
P0AA4-00 is identified in verified Stellantis service evidence as “Hybrid Battery Negative Contactor Circuit Stuck Closed.” The evidence states it is a hard fault that requires high-voltage battery pack replacement when set during module flashing.
2. Technical explanation
Verified Stellantis technical-assistance evidence says P0AA4-00 can be set while performing module flashes. It states that, when this occurs, the fault is a hard fault and requires battery-pack replacement. The same evidence says it is critical to wait 5 minutes after using “Disable HV Battery Contactors” before proceeding with flashing, to allow high-voltage capacitors to drain. A separate official customer-satisfaction procedure instructs technicians to verify contactor operation and confirm P0AA4/P0AA1 and any other DTCs are not active or pending after the procedure.
3. What system is affected?
High-voltage battery contactor system; specifically, the hybrid battery negative contactor circuit.
4. How serious is this code?
The supplied verified service evidence describes P0AA4-00 as a hard fault when it is set during module flashing. The database does not otherwise establish a general severity classification.
5. Symptoms you may notice
- A P0AA4-00 diagnostic trouble code may be present.
- Verified evidence does not establish customer-observable driving or charging symptoms.
6. Possible causes
- Verified Stellantis technical-assistance evidence identifies a possibility of setting P0AA4-00 while performing module flashes.
- The evidence does not establish other causes.
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 battery or contactor repairs yourself.
- If P0AA4-00 is present, arrange diagnosis by an authorized Jeep/Stellantis service facility.
- For technicians performing module flashes, follow the applicable official procedure, including the stated 5-minute wait after disabling HV battery contactors.
10. Step-by-step troubleshooting
- A qualified technician can use the official diagnostic system to check whether P0AA4/P0AA1 or any other DTC is active or pending, as specified in the official procedure.
- The official procedure also calls for verification of contactor operation after service.
- No further troubleshooting steps are established by the supplied verified evidence.
11. When to contact service
Contact an authorized Jeep/Stellantis service facility. The verified evidence describes P0AA4-00 as requiring high-voltage battery pack replacement when set during module flashing.
12. What the service center may check
- Check for active or pending P0AA4, P0AA1, or other DTCs using the applicable official diagnostic system.
- Verify high-voltage battery contactor operation as directed by the official service procedure.
- When performing module flashes, follow the official process for disabling high-voltage battery contactors and observe the specified 5-minute wait before proceeding.
13. Possible repair or resolution
- Verified Stellantis technical-assistance evidence states that P0AA4-00 is a hard fault requiring battery-pack replacement when it occurs during module flashing.
- No alternative repair resolution is established by the supplied verified evidence.
14. Affected vehicles
- Jeep Wrangler · 2021–2023 · US
- Jeep Wrangler · 2022–2023 · US
15. Related TSBs / service bulletins
- NHTSA Manufacturer Communication 10229764, Stellantis case S2208000199, released December 2022: warns that module flashing can set P0AA4-00 and states that it requires battery-pack replacement; specifies a 5-minute wait after disabling HV battery contactors before proceeding.
- NHTSA Manufacturer Communication 10236891, Customer Satisfaction Notification 23A, published April 13, 2023: includes contactor verification and a check to ensure P0AA4/P0AA1 or any DTC is not active or pending.
16. Recall information
- Not yet established by verified evidence. The supplied documents are manufacturer communications/service material, not recall evidence.
17. Official manufacturer information
Verified applicability in the supplied database is Jeep Wrangler, US market, model years 2021–2023. Source: NHTSA manufacturer communications 10229764 and 10236891.
19. Frequently asked questions
What does Jeep code P0AA4-00 mean?
Verified evidence identifies it as “Hybrid Battery Negative Contactor Circuit Stuck Closed.”
Can a module flash trigger P0AA4-00?
Yes. Verified Stellantis technical-assistance evidence says there is a possibility of setting P0AA4-00 while performing module flashes.
Does P0AA4-00 require battery replacement?
The verified Stellantis evidence states that P0AA4-00 is a hard fault requiring battery-pack replacement when it occurs during module flashing.
Can I drive or charge with P0AA4-00?
Not yet established by verified evidence.