B146E – Channel 3 audio speaker output circuit short together (Dodge)

B146E means the Charger’s audio system has detected a speaker channel fault, and you may lose sound from one speaker or hear distorted audio. Most owners notice one side goes quiet, the volume drops, or the radio “cuts out” to protect itself. According to Dodge factory diagnostic data, this code indicates a “Channel 3 audio speaker output circuit short together.” That wording points to the two wires for that speaker output touching each other somewhere. The code does not prove a bad radio. It flags a suspected circuit problem that you must confirm with wiring and load checks first.

B146E Quick Answer

B146E on a 2007 Dodge Charger sets when the radio/amplifier sees Channel 3 speaker output wires shorted together. Verify the speaker wiring, connector pins, and the speaker load before replacing the radio or amplifier.

What Does B146E Mean?

Official definition: “Channel 3 audio speaker output circuit short together.” In plain English, the audio module detected that the two wires feeding one speaker output are touching each other. When that happens, the module often shuts that channel down to prevent damage. You get no sound, weak sound, or harsh distortion from that channel.

What the module is actually checking: the radio or external amplifier monitors output current and the relationship between the two speaker output legs during operation. A “short together” means the + and – output wires for that channel show abnormally low resistance between them. Why this matters: the same symptom can come from a pinched harness, a wet door connector, or a failed speaker coil. The DTC only points to the circuit as the trouble area. It does not name the root cause.

Theory of Operation

On Dodge vehicles, the radio or amplifier drives each speaker channel using two output wires. Those outputs float, and they do not use chassis ground as the return. The module expects a stable speaker load through the wiring and the speaker voice coil.

When the two output wires contact each other, current spikes and the waveform collapses. The module responds by limiting or shutting down that channel. It then stores B146E after it confirms the condition persists or repeats. A partially shorted harness can trigger the code only at certain door positions.

Symptoms

These symptoms usually affect only the speaker tied to Channel 3.

• No audio from one speaker while others work
• Distortion or crackling that worsens with volume
• Audio cuts out when hitting bumps or moving a door
• Low volume on one corner or one side
• Radio protection behavior such as muting a channel after a few seconds
• Intermittent operation that returns after cycling the key or radio power
• Balance/fader change has little effect on the dead channel

Common Causes

• Speaker output wires shorted together: Chafed insulation or pinched harness lets the two channel output conductors touch, so the radio/amplifier detects a short-together condition.
• Damaged speaker or internal speaker short: A failed speaker voice coil or terminal bridge can couple the two output paths and trigger the module’s output protection.
• Corrosion or liquid intrusion at door or rear deck connector: Moisture creates a conductive path between the paired output circuits and raises current demand.
• Incorrect aftermarket speaker wiring: Tying channels together, sharing grounds, or misusing adapter harnesses can electrically link outputs that must stay isolated.
• Harness damage in the door jamb boot: Repeated door movement breaks insulation and shifts conductors until they contact each other under vibration.
• Pin fit or terminal drag at radio/amplifier connector: Spread terminals or partial back-outs allow adjacent pins to touch or intermittently bridge under load.
• Shorted speaker lead inside the trim panel: A screw, clip, or sharp metal edge can cut the insulation and press both conductors together when the panel flexes.
• Internal fault in the radio/amplifier output stage: A damaged output IC can internally couple the outputs, but you must prove the harness and speaker load first.

Diagnosis Steps

You need a scan tool that reads Dodge body/audio DTCs, a DMM, and a fused test light. Use back-probing pins and terminal tools for connector checks. Have basic trim tools to access the radio, amplifier (if equipped), and the Channel 3 speaker. If available, use an audio test tone source or the radio balance/fade controls to load the channel.

1. Confirm DTC B146E and record stored versus pending status. Save freeze frame or failure records if the scan tool provides them. For this circuit fault, focus on battery voltage, ignition state, and whether audio output commanded ON when the code set. Freeze frame shows conditions at set time, while a scan tool snapshot you trigger can catch an intermittent short during a road test.
2. Perform a fast visual inspection before meter work. Check the audio system fuse(s) and any amplifier power fuses in the power distribution center. Inspect for blown fuses, heat damage, or incorrect fuse ratings. Look for obvious harness pinch points near the radio stack, door sills, seat tracks, and the door jamb boots.
3. Verify module power and ground under load, not with an unloaded voltage check. Turn the system on and load the circuit (radio ON, volume at a moderate level, or use a test tone). Measure voltage drop from the radio/amplifier ground pin to battery negative while operating. Keep ground drop under 0.1V with the circuit active, or fix the ground path before chasing the speaker wiring.
4. Run a network scan and check for related audio codes. Note any companion DTCs that mention other channels or “output short to battery/ground.” Multiple channel faults often point to a shared connector issue, a poor ground, or an amplifier fault. A single-channel “short together” usually points to that channel’s two-conductor run or the speaker itself.
5. Use the radio balance/fade to isolate Channel 3 operation. Move balance and fade to command only the suspected speaker to play. Listen for distortion, cutting out, or a rapid mute that matches output protection. If the audio cuts out only when you command that corner, treat it as a hard load problem on that channel.
6. Access the Channel 3 speaker connector and inspect it closely. Verify the connector seats fully, the lock engages, and the terminals sit at equal depth. Look for green corrosion, overheated plastic, or stray wire strands. Repair terminal damage before continuing, because a bridged terminal pair can mimic a short-together in the harness.
7. Isolate the load to separate speaker faults from harness faults. Disconnect the Channel 3 speaker and clear codes. Turn the key on and operate the audio system again. If B146E returns immediately with the speaker unplugged, the short exists in the harness or inside the radio/amplifier output stage.
8. Check the speaker itself for an internal short-together condition. With the speaker disconnected, measure resistance across the speaker terminals and compare to a known-good speaker on the vehicle. Then inspect the speaker terminals for contact with the frame or each other. Replace or repair the speaker only if you confirm a defect at the component.
9. Test the harness for a short between the two channel output conductors. Keep the radio/amplifier connector disconnected and keep the speaker disconnected. Measure resistance between the two speaker output wires for Channel 3. You should not see continuity between them through the harness alone. If you find continuity, flex the harness in the door boot and along the routing to locate an intermittent bridge.
10. Inspect the radio/amplifier connector pin fit and evidence of pin-to-pin contact. Look for spread terminals, pushed-back pins, or damaged seals. Pay attention to any signs of prior aftermarket radio work. Correct pin fit issues and repair terminal tension problems, because an intermittent pin bridge can set B146E only when vibration peaks.
11. Confirm the repair with a controlled retest. Reconnect components, clear DTCs, and command audio output on Channel 3 for several minutes. Then perform a road test over bumps while monitoring for pending or stored codes. Use a scan tool snapshot during the drive if the concern is intermittent. Verify the code does not reset and that the speaker plays cleanly.

Professional tip: Dodge audio outputs use a two-wire speaker circuit, not a chassis ground speaker return. Treat both wires as active. If an aftermarket installer tied one side to ground or paired it with another channel, the module can flag “short together” even though the speaker still makes sound at low volume.

Possible Fixes

• Repair chafed or pinched Channel 3 speaker wiring: Restore insulation, correct routing, and secure the harness to prevent repeat contact.
• Clean and repair corroded connectors or terminals: Remove moisture damage, restore terminal tension, and replace terminals that show heat or pitting.
• Correct aftermarket wiring errors: Rewire the speaker circuit so Channel 3 outputs remain isolated and use proper adapters instead of splices.
• Replace a confirmed failed speaker: Install a correct-impedance speaker only after you prove the wiring does not short together.
• Repair door jamb boot wiring: Splice with proper strain relief and rewrap to survive repeated door movement.
• Replace the radio or amplifier only after isolation tests: If the short-together persists with the harness and speaker disconnected, the output stage likely failed.

Can I Still Drive With B146E?

You can usually drive a 2007 Dodge Charger with DTC B146E, because this fault targets the audio speaker output circuit. It does not control braking, steering, or engine torque. Expect reduced or missing sound from one speaker channel. You may also hear distortion, popping, or the radio cutting out at higher volume. Keep the volume low until you diagnose it. A “short together” can overheat speaker wiring or stress the radio’s internal amplifier. If you smell hot plastic, see smoke, or the radio shuts down repeatedly, stop driving and shut the audio system off.

How Serious Is This Code?

B146E rates as low to moderate severity. Most of the time it remains an inconvenience, because it only affects sound quality and speaker operation. The risk increases when the short occurs in the door or deck harness. Harness movement can turn an intermittent rub-through into a hard short. That can overheat wiring or damage the radio amplifier output stage. This code does not create a direct drivability issue, but it can distract the driver with loud noise or repeated audio dropouts. Treat it as urgent if the fault appears with other electrical issues, blown fuses, or any heat signs at the speaker wiring.

Common Misdiagnoses

Technicians often replace the speaker first, because “no sound” feels like a speaker problem. B146E specifically points to a circuit condition on Channel 3. That condition often comes from two speaker output wires touching each other. The rub usually happens where Dodge harnesses flex, like door boots or rear deck pass-throughs. Another common mistake involves probing the speaker wires with a test light. That can overload the amplifier output and create new faults. Some also condemn the radio immediately when the amplifier mutes. Avoid that. Prove the short together with isolation tests at the speaker and radio connectors before replacing anything.

Most Likely Fix

The most common confirmed repair involves finding and repairing chafed speaker wiring for Channel 3, then restoring correct insulation and routing. Door jamb harness sections and trunk/deck-lid hinge areas deserve extra attention on a Dodge Charger. A second frequent repair corrects a shorted speaker or water-contaminated speaker connector that bridges the two output wires. Do not treat the radio as failed until the circuit passes isolation checks. After repairs, clear the DTC and drive with the audio operating. Confirm the code does not reset, since enable criteria and self-test timing vary by Dodge platform.

Repair Costs

Repair cost depends on whether the confirmed root cause is a sensor, wiring, connector issue, or control module problem. Verify the fault electrically before replacing parts.

Last updated: March 31, 2026