B1A04 on 2008-2023 Dodge Challenger (SXT, GT, R/T, R/T Scat Pack, 392, SRT 392, SRT Hellcat, SRT Hellcat Redeye) — Speaker #4 General Electrical Failure
1 vehicles · 1 makes · $35-$1,940 repair
Most Reported On
B1A04 is an OBD-II diagnostic trouble code meaning “Speaker #4 General Electrical Failure.” A Ford body code set by the Audio Control Module when it detects an electrical fault on the speaker #4 circuit. Ford's service charts break it out by sub-type: :01 general electrical failure, :11 short to ground, :12 short to battery voltage, :13 circuit open. The module disables that speaker output when the code is set, so the practical symptom is audio loss from one speaker. Which physical speaker is "#4" is not fixed across the lineup - Ford ACM charts assign speaker numbers differently depending on the audio system fitted, so the location must be read from the specific vehicle's wiring diagram rather than assumed. It has no effect on how the vehicle drives. This code is most commonly reported on 2008-2023 Dodge Challenger (SXT, GT, R/T, R/T Scat Pack, 392, SRT 392, SRT Hellcat, SRT Hellcat Redeye), with repair costs ranging from $35 to $1,940.
Common Causes
Typical Repair Cost
Based on 1 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
B1A04 does not use the standard P/B/C/U prefix. It may be a manufacturer-specific code, so verify that a scanner supports your exact year, model and module before buying.
FAQ
What does B1A04 mean?
B1A04 stands for "Speaker #4 General Electrical Failure." A Ford body code set by the Audio Control Module when it detects an electrical fault on the speaker #4 circuit. Ford's service charts break it out by sub-type: :01 general electrical failure, :11 short to ground, :12 short to battery voltage, :13 circuit open. The module disables that speaker output when the code is set, so the practical symptom is audio loss from one speaker. Which physical speaker is "#4" is not fixed across the lineup - Ford ACM charts assign speaker numbers differently depending on the audio system fitted, so the location must be read from the specific vehicle's wiring diagram rather than assumed. It has no effect on how the vehicle drives.
What are the most common causes of B1A04?
The most common causes of B1A04 are: Open, shorted, or chafed wiring in the speaker circuit (often at a door harness boot flex point), Failed speaker, including damage from excessive volume, Corroded or loose speaker or door-jamb connector, Aftermarket audio installation shorting the factory speaker circuit, Faulty Audio Control Module or amplifier. The specific cause varies by vehicle.
How much does it cost to fix B1A04?
Repair costs for B1A04 range from $35 to $1,940, depending on the vehicle and root cause.
Which vehicles are affected by B1A04?
Au7o has documented B1A04 across 1 vehicle models from 1 manufacturers: Dodge.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.