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Mitsubishi P1AB9

CMU05 module temperature abnormal (low input), P1ABA: CMU06 module temperature abnormal (low input), P1ABB: CMU07 module temperature abnormal (low input), P1ABC: CMU08 module tempe

DriveNot yet established by verified evidence. The diagnostic record marks safe-to-drive status as unknown.
ChargeNot yet established by verified evidence. The diagnostic record marks safe-to-charge status as unknown.
ServiceContact a qualified Mitsubishi EV service facility for diagnosis and any Main Drive Lithium-ion Battery work.
Confidence95%

Quick answer

For Mitsubishi i-MiEV vehicles covered by the cited 2019 Mitsubishi service bulletins, P1AB9 identifies a CMU05 module-temperature abnormality described as “low input.” The bulletin’s stated action, if the DTC is stored, is replacement of the Main Drive Lithium-ion Battery.

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 P1AB9 mean?

For Mitsubishi i-MiEV vehicles covered by the cited 2019 Mitsubishi service bulletins, P1AB9 identifies a CMU05 module-temperature abnormality described as “low input.” The bulletin’s stated action, if the DTC is stored, is replacement of the Main Drive Lithium-ion Battery.

2. Technical explanation

P1AB9 is listed in Mitsubishi bulletin material as: “CMU05 module temperature abnormal (low input).” CMU05 denotes the fifth battery-cell monitoring unit/module in the bulletin’s code grouping. The supplied evidence does not establish a component-level cause beyond this diagnostic description.

3. What system is affected?

Main Drive Lithium-ion Battery monitoring/temperature-input system. The exact system name is not otherwise established by the supplied record.

4. How serious is this code?

Not yet established by verified evidence. The diagnostic record marks severity as unknown.

5. Symptoms you may notice

  • Not yet established by verified evidence.

6. Possible causes

  • A CMU05 module-temperature abnormal “low input” condition is identified by the code description.
  • A more specific root cause is not yet established by verified evidence.

7. Can I still drive the vehicle?

Not yet established by verified evidence. The diagnostic record marks safe-to-drive status as unknown.

8. Can I charge the vehicle?

Not yet established by verified evidence. The diagnostic record marks safe-to-charge status as unknown.

9. What you can safely do

  • Arrange assessment by a qualified Mitsubishi EV service facility.
  • Do not attempt high-voltage battery diagnosis, disassembly, or repair yourself.

10. Step-by-step troubleshooting

  1. A Mitsubishi service procedure asks whether the diagnostic trouble code is stored.
  2. Per the cited bulletin evidence: if the DTC is stored, replace the Main Drive Lithium-ion Battery; if it is not stored, the diagnosis is complete.
  3. No further troubleshooting steps are established by the supplied verified evidence.

11. When to contact service

Contact a qualified Mitsubishi EV service facility for diagnosis and any Main Drive Lithium-ion Battery work.

12. What the service center may check

  • Confirm whether P1AB9 is stored.
  • Follow the applicable Mitsubishi bulletin decision: stored DTC—replace the Main Drive Lithium-ion Battery; DTC not stored—diagnosis complete.

13. Possible repair or resolution

  • The cited Mitsubishi bulletins specify replacement of the Main Drive Lithium-ion Battery when P1AB9 is stored.
  • No component-level repair alternative is established by the supplied evidence.

14. Affected vehicles

15. Related TSBs / service bulletins

  • TSB-19-54-004, published March 13, 2019; NHTSA manufacturer communication MC-10158409. It lists P1AB9 as CMU05 module temperature abnormal (low input) and states to replace the Main Drive Lithium-ion Battery if the DTC is stored. https://static.nhtsa.gov/odi/tsbs/2019/MC-10158409-9999.pdf
  • TSB-19-54-003, published March 13, 2019; NHTSA manufacturer communication MC-10158408. It provides the same stored-DTC decision and battery-replacement instruction. https://static.nhtsa.gov/odi/tsbs/2019/MC-10158408-9999.pdf

16. Recall information

  • Not yet established by verified evidence.

17. Official manufacturer information

Verified applicability in the supplied database is Mitsubishi i-MiEV, US market, model years 2012 and 2014. Source documents are Mitsubishi manufacturer communications published through NHTSA on March 13, 2019: MC-10158409 / TSB-19-54-004 and MC-10158408 / TSB-19-54-003.

19. Frequently asked questions

What does P1AB9 mean?

It means “CMU05 module temperature abnormal (low input)” according to the cited Mitsubishi bulletin evidence.

What does Mitsubishi’s bulletin say to do if P1AB9 is stored?

The bulletin states: replace the Main Drive Lithium-ion Battery.

Can I drive or charge with P1AB9?

Not yet established by verified evidence. Both safe-to-drive and safe-to-charge statuses are recorded as unknown.

Which vehicles are verified as applicable?

The supplied database verifies US-market Mitsubishi i-MiEV model years 2012 and 2014.

20. Sources & verification

Verified
Mitsubishi P1AB9: CMU05 module temperature abnormal (low input),… | EV Diagnostics