Mitsubishi P1AC0
ion battery starts to be charged. Either one of the following diagnostic trouble codes is not set . a. P1AA8: Bat-CAN signal time out b. U1082: Bat-CAN bus-off Judgmen
Quick answer
For a 2016 Mitsubishi i-MiEV (US), P1AC0 is identified in the verified Mitsubishi bulletin as “CMU12 Battery Low Temperature.”
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 P1AC0 mean?
For a 2016 Mitsubishi i-MiEV (US), P1AC0 is identified in the verified Mitsubishi bulletin as “CMU12 Battery Low Temperature.”
2. Technical explanation
Verified TSB evidence states that the trouble judgment check conditions include: 3 seconds after the electric motor switch is turned ON, or 3 seconds after the main drive lithium-ion battery begins charging; and either P1AA8 (Bat-CAN signal time out) or U1082 (Bat-CAN bus-off) is not set. The supplied evidence does not establish the complete detection threshold or diagnostic procedure.
3. What system is affected?
Main drive lithium-ion battery monitoring, specifically CMU12 (Cell Monitoring Unit 12), according to the verified bulletin wording.
4. How serious is this code?
Not yet established by verified evidence.
5. Symptoms you may notice
Not yet established by verified evidence.
6. Possible causes
- The verified evidence identifies P1AC0 as CMU12 Battery Low Temperature. A root cause beyond that designation is 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
- Record whether P1AC0 occurs after the electric motor switch is turned ON or after charging begins.
- Have the vehicle evaluated by a qualified Mitsubishi EV service provider if diagnosis is needed.
- Do not attempt high-voltage battery or battery-monitoring repairs yourself.
10. Step-by-step troubleshooting
- Use manufacturer-level diagnostic information to confirm the DTC and associated conditions. Detailed troubleshooting steps are not established by the supplied verified evidence.
11. When to contact service
Contact a qualified Mitsubishi EV service provider for diagnosis if P1AC0 is present or recurs.
12. What the service center may check
- Confirm P1AC0 is stored.
- Review whether the code occurred at least 3 seconds after the electric motor switch was turned ON or at least 3 seconds after main drive lithium-ion battery charging began.
- Check whether P1AA8 or U1082 is set, because the verified trouble-judgment conditions state that either one is not set.
13. Possible repair or resolution
- Not yet established by verified evidence.
14. Affected vehicles
- Mitsubishi i-MiEV · 2016 · US
15. Related TSBs / service bulletins
- Mitsubishi TSB-19-54-005, published March 13, 2019, is the verified source identifying P1AC0 as CMU12 Battery Low Temperature for the applicable vehicle.
16. Recall information
No recall relationship is established by verified evidence.
17. Official manufacturer information
Verified official source: NHTSA-hosted Mitsubishi Manufacturer Communication PDF 10158410, TSB-19-54-005: https://static.nhtsa.gov/odi/tsbs/2019/MC-10158410-9999.pdf
19. Frequently asked questions
What does P1AC0 mean on a 2016 Mitsubishi i-MiEV?
The verified Mitsubishi bulletin identifies P1AC0 as CMU12 Battery Low Temperature.
When can P1AC0 be judged?
The verified bulletin lists conditions including 3 seconds after the electric motor switch is turned ON, or 3 seconds after main drive lithium-ion battery charging starts. It also states that either P1AA8 or U1082 is not set.
Does P1AC0 prove a battery hardware failure?
Not yet established by verified evidence.