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Mitsubishi P1AB7

CMU03 module temperature abnormal (low input), P1AB8: CMU04 module temperature abnormal (low input), P1AB9: CMU05 module temperature abnormal (low input), P1ABA: CMU06 module tempe

DriveNot yet established by verified evidence.
ChargeNot yet established by verified evidence.
ServiceService is appropriate because the official Mitsubishi bulletin specifies BMU diagnostic functions and, if the DTC remains stored, replacement of the Main Drive Lithium-ion Battery.
Confidence95%

Quick answer

P1AB7 is a Mitsubishi DTC for “CMU03 module temperature abnormal (low input).” Verified applicability is limited to U.S.-specification 2012 and 2014 Mitsubishi i-MiEV vehicles. Mitsubishi service bulletins direct technicians to perform the BMU “CMU ID numbering” special function; if the DTC remains stored, replace 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 P1AB7 mean?

P1AB7 is a Mitsubishi DTC for “CMU03 module temperature abnormal (low input).” Verified applicability is limited to U.S.-specification 2012 and 2014 Mitsubishi i-MiEV vehicles. Mitsubishi service bulletins direct technicians to perform the BMU “CMU ID numbering” special function; if the DTC remains stored, replace the Main Drive Lithium-ion Battery.

2. Technical explanation

The verified description identifies P1AB7 as a low-input abnormality for the CMU03 module-temperature signal. The supplied official Mitsubishi bulletin evidence places the diagnostic process in the BMU and specifies use of the “CMU ID numbering” function on the BMU special-function screen. The evidence does not establish a more specific component-level cause for the low-input condition.

3. What system is affected?

Battery Monitoring Unit (BMU) and the Main Drive Lithium-ion Battery temperature-monitoring system, specifically CMU03.

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

  • A CMU03 module-temperature abnormal low-input condition is identified by the DTC description.
  • A more specific underlying cause 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

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

10. Step-by-step troubleshooting

  1. A technician accesses the BMU special-function screen.
  2. A technician selects and executes “CMU ID numbering.”
  3. The technician checks whether the diagnostic trouble code is stored after this procedure.
  4. If the DTC is no longer stored, the bulletin states that diagnosis is complete.
  5. If the DTC remains stored, the bulletin directs replacement of the Main Drive Lithium-ion Battery.

11. When to contact service

Service is appropriate because the official Mitsubishi bulletin specifies BMU diagnostic functions and, if the DTC remains stored, replacement of the Main Drive Lithium-ion Battery.

12. What the service center may check

  • Check for P1AB7 stored in the BMU.
  • Execute the BMU “CMU ID numbering” special function.
  • Recheck whether P1AB7 remains stored after the procedure.

13. Possible repair or resolution

  • If P1AB7 remains stored after the BMU “CMU ID numbering” procedure, replace the Main Drive Lithium-ion Battery.
  • If P1AB7 is not stored after the procedure, the official bulletin states that diagnosis is complete.

14. Affected vehicles

15. Related TSBs / service bulletins

  • Mitsubishi TSB-19-54-004, published March 13, 2019; NHTSA manufacturer communication MC-10158409-9999: includes P1AB7 in the CMU module-temperature abnormal (low input) diagnostic procedure.
  • Mitsubishi TSB-19-54-003, published March 13, 2019; NHTSA manufacturer communication MC-10158408-9999: includes P1AB7 in the CMU module-temperature abnormal (low input) diagnostic procedure.

16. Recall information

  • Not yet established by verified evidence.

17. Official manufacturer information

Official source: NHTSA-hosted Mitsubishi manufacturer communications TSB-19-54-004 and TSB-19-54-003, both published March 13, 2019. https://static.nhtsa.gov/odi/tsbs/2019/MC-10158409-9999.pdf ; https://static.nhtsa.gov/odi/tsbs/2019/MC-10158408-9999.pdf

19. Frequently asked questions

What does Mitsubishi code P1AB7 mean?

It means “CMU03 module temperature abnormal (low input).”

Which vehicles are verified for P1AB7?

The supplied evidence verifies U.S.-specification 2012 and 2014 Mitsubishi i-MiEV models.

What does the Mitsubishi bulletin direct if P1AB7 remains stored?

After the BMU “CMU ID numbering” function is executed, the bulletin directs replacement of the Main Drive Lithium-ion Battery if the DTC remains stored.

Is it safe to drive or charge with P1AB7?

Not yet established by verified evidence.

20. Sources & verification

Verified
Mitsubishi P1AB7: CMU03 module temperature abnormal (low input),… | EV Diagnostics