P3030 - Disconnection Between Battery And ECU

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3   
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P3030 Possible Causes

  • Junction block assembly (busbar module)
  • Faulty Battery ECU

First diagnose P3030 code

    Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded terminals.

Cost of diagnosing the P3030 code

    Labor: 1.0

    The cost of diagnosing the P3030 code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.

P3030 Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P3030 Description

The battery Electronic Control Unit (ECU) monitors a voltage of the battery blocks to detect an open malfunction in internal battery voltage sensor circuits of the battery ECU and the wire harness between each battery block and battery ECU. If a voltage at one of the battery blocks is below a standard level or of all the battery blocks is within a specified range, the battery ECU judges that there is an open in the internal sensor circuit(s) or wire harness. The battery ECU then illuminates the Malfunction Indicator Lamp (MIL) and sets a Diagnostic Trouble Code (DTC).
OBDII Code P3030 - Disconnection Between Battery And ECU - AutoCodes.com

P3030 More Information

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P3030 Information for specific makes

  • P3030 BUICK Hybrid/EV Battery Interface Control Module 11 Not Programmed
  • P3030 CADILLAC Hybrid/EV Battery Interface Control Module 11 Not Programmed
  • P3030 CHEVROLET Hybrid/EV Battery Interface Control Module 11 Not Programmed
  • P3030 GMC Hybrid/EV Battery Interface Control Module 11 Not Programmed
  • P3030 LEXUS Disconnection Between Battery And ECU
  • P3030 SATURN Hybrid/EV Battery Interface Control Module 11 Not Programmed
  • P3030 TOYOTA Disconnection Between Battery And ECU

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