P3602moderate severityPowertrain
Intelligent Battery Sensor (IBS) Circuit Malfunction
on 2018 Infiniti Q70L 5.6L V8 · RWD
What this code means
The intelligent battery sensor that monitors 12V battery current, voltage, and temperature has a circuit fault. The IBS is critical for start-stop and energy management.
Symptoms
- Start-stop disabled
- Battery charge management affected
- Incorrect battery status display
- Alternator not properly regulated
- Parasitic draw calculation incorrect
Common causes
- IBS sensor failure
- Corroded battery terminal affecting IBS
- IBS wiring damage
- Battery replaced without IBS re-registration
- IBS communication fault
Diagnostic steps
- Read IBS data via scan tool
- Check IBS connector and mounting
- Test IBS communication on LIN bus
- Verify battery registration status
- Measure IBS signals vs actual battery parameters
Repair notes
Replace IBS sensor if faulty. After battery replacement, always register new battery with the IBS/BMS system.
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