Subwoofer Circuit Open
The B0987 code means the vehicle's onboard diagnostic system has detected: Subwoofer Circuit Open. This is a low severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- easy
- Estimated cost
- $50 - $500 (parts and labor)
Basic scanners skip body codes entirely. BlueDriver reads airbag, HVAC, lighting, and BCM codes through your phone.
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Common Symptoms
- No sound from one or more speakers
- Audio sounds distorted
- Crackling or popping from speakers
- Audio cuts out intermittently
Probable Causes (Ranked by Likelihood)
- Blown speaker voice coil Very High
- Damaged speaker wiring High
- Faulty audio amplifier Moderate
- Head unit audio output fault Low
Step-by-Step Diagnostic Procedure
-
Test speaker with known-good audio signal
-
Measure speaker impedance with multimeter
-
Check speaker wiring for breaks or shorts
-
Verify amplifier output channels
Frequently Asked Questions
Why does only one speaker not work?
Usually the speaker itself has blown or the wiring to that specific speaker is damaged.
Can I upgrade to aftermarket speakers?
Yes, aftermarket speakers are widely available for most vehicles and are a common DIY upgrade.
What causes speaker distortion?
A torn speaker cone, water damage, or a failing amplifier channel commonly cause audio distortion.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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