How do I test for parasitic drain?

With engine off, put a multimeter in series with the battery negative cable. Anything over 50mA indicates a drain.

Can a weak battery cause multiple codes?

Yes — low voltage causes erratic behavior in multiple modules, often setting numerous codes. Fix the battery first and see if codes clear.

Medium Severity

Body/Electrical System

The body control module detects low battery voltage.

Common Fix

Replace battery or alternator

Estimated Cost (DIY)

$100 - $300

Weak batterylikely

Failing alternatorpossible

Parasitic drainpossible

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How do I test for parasitic drain?: With engine off, put a multimeter in series with the battery negative cable. Anything over 50mA indicates a drain.
Can a weak battery cause multiple codes?: Yes — low voltage causes erratic behavior in multiple modules, often setting numerous codes. Fix the battery first and see if codes clear.

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