Jeep P0A78
Drive Motor A Inverter Performance. ?P0A79-00 - Drive Motor B Inverter Performance. Customer may also experience the following: ? Inte
Quick answer
For a 2021 Jeep Wrangler in the US, DTC P0A78 is identified in verified NHTSA manufacturer communication evidence as “Drive Motor A Inverter Performance.” The supplied evidence also associates P0A79-00, “Drive Motor B Inverter Performance,” with the same communication.
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 P0A78 mean?
For a 2021 Jeep Wrangler in the US, DTC P0A78 is identified in verified NHTSA manufacturer communication evidence as “Drive Motor A Inverter Performance.” The supplied evidence also associates P0A79-00, “Drive Motor B Inverter Performance,” with the same communication.
2. Technical explanation
The verified source is NHTSA Manufacturer Communication 10242816: 0817823, published July 20, 2023. Its evidence summary states that a Malfunction Indicator Lamp (MIL) may illuminate and that technicians may find P0A78-00 (Drive Motor A Inverter Performance) and P0A79-00 (Drive Motor B Inverter Performance). The supplied excerpt is truncated, so the underlying failure mechanism, diagnostic procedure, and repair are not established by verified evidence.
3. What system is affected?
Drive Motor A inverter performance. The supplied communication also references Drive Motor B inverter performance under P0A79-00.
4. How serious is this code?
Not yet established by verified evidence.
5. Symptoms you may notice
- Malfunction Indicator Lamp (MIL) illumination is stated in the verified manufacturer communication.
- The supplied source excerpt indicates customers may experience additional conditions, but those conditions are truncated and not established by the provided verified evidence.
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
- Arrange diagnosis by an authorized Jeep service facility or a qualified technician.
- Do not attempt high-voltage inverter diagnosis or repair yourself.
10. Step-by-step troubleshooting
- Have a technician retrieve and document stored diagnostic trouble codes, including whether P0A78-00 and P0A79-00 are present.
- Use the applicable Jeep service information and the referenced manufacturer communication for diagnosis. Further steps are not established by the supplied verified evidence.
11. When to contact service
Service is recommended because the verified evidence identifies an inverter-performance DTC and MIL illumination, but urgency and drivability are not established by the supplied evidence.
12. What the service center may check
- Confirm the stored DTCs and any accompanying codes.
- Review NHTSA Manufacturer Communication 10242816: 0817823 for the applicable 2021 Jeep Wrangler context.
- Further inspection and test requirements are not established by verified evidence.
13. Possible repair or resolution
- Not yet established by verified evidence.
14. Affected vehicles
- Jeep Wrangler · 2021 · US
15. Related TSBs / service bulletins
- NHTSA Manufacturer Communication 10242816: 0817823, published July 20, 2023. Verified excerpt: MIL illumination may occur; P0A78-00 is listed as Drive Motor A Inverter Performance and P0A79-00 as Drive Motor B Inverter Performance.
16. Recall information
- Not yet established by verified evidence.
17. Official manufacturer information
Verified official source: NHTSA Manufacturer Communication 10242816: 0817823 (July 20, 2023): https://static.nhtsa.gov/odi/ffdd/tsbs/TSBS_RECEIVED_2020-2024.zip#nhtsa_id=10242816. Verified applicability supplied: 2021 Jeep Wrangler, US.
- NHTSA: NHTSA Manufacturer Communication 10242816: 0817823 · official_tsb
19. Frequently asked questions
What does P0A78 mean for the verified Jeep application?
For the verified 2021 Jeep Wrangler US application, P0A78-00 is identified as Drive Motor A Inverter Performance.
Can P0A79 occur with P0A78?
Yes. The verified NHTSA manufacturer communication lists P0A79-00, Drive Motor B Inverter Performance, alongside P0A78-00.
Does P0A78 confirm a specific failed part?
No. A specific failed component is not established by the supplied verified evidence.
Is it safe to drive or charge with P0A78?
Not yet established by verified evidence.