Disconnection Between Battery And ECU
Table of contents
P3030 LEXUS Possible Causes
- Junction block assembly (busbar module)
- Faulty Battery ECU
How do I fix code P3030 LEXUS?
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 connector’s pins.
Cost of diagnosing the P3030 LEXUS code
The cost of diagnosing the P3030 LEXUS 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.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P3030 LEXUS 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).
