What it means
Voltage on the sound generator A control line is below the expected window. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
At a glance
- Usually lights the check-engine light
How it works
Engine Sound Control A is the vehicle's first designated sound-generation channel, used in equipped vehicles for a simulated engine sound or an acoustic warning. The module monitors its control-line voltage; this code sets when that voltage is below the expected range, which can leave the sound absent or weak.
Common causes
Most likely first.
- Control wire shorted to ground
- Amplifier input stage short
- Connector pins corroded - high contact resistance
Symptoms
- Check-engine light may be on
- Pedestrian warning sound or simulated engine sound may be absent or weak
How to diagnose it
- Check freeze-frame data and live fault status to confirm the low reading is on Engine Sound Control A, then verify whether its sound is absent or weak.
- Inspect the channel A control wire and amplifier connector for chafing, moisture, corrosion, loose pins, or a short to ground.
- Monitor the control signal while gently moving the harness to identify a connection or wiring fault that changes with movement.
- Test the control wire for a short to ground and check connector contact quality using the manufacturer's wiring information.
- If the wiring is sound, test the amplifier input stage for an internal short against the manufacturer's specification.
Common fixes
- Clean and secure the channel A connector terminals.
- Repair control wiring shorted to ground or damaged by chafing.
- Replace corroded or loose connector terminals that cause a poor connection.
- Replace the amplifier if its channel A input stage is confirmed shorted.
Can I keep driving?
If channel A provides an EV or hybrid pedestrian warning, avoid relying on its sound to alert people nearby and arrange prompt repair. If it only provides simulated engine sound, driving is generally unaffected.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.