Hi everyone,

I need some advice: I'm getting a deep booming noise inside the cabin of my brand-new 2026 Chrysler Grand Caravan SXT (aka Chrysler Voyager). The van has only 650 km on the odometer (404 miles).

If you have a subwoofer or large speakers, you can hear the noise for yourself in my 4-minute YouTube video:

You Tube

Note that small speakers, especially cellphone speakers, are much too small to reproduce such a low-pitched sound (32 Hz).

I first noticed the noise when I was stopped at a red light for a couple of minutes. My foot was on the brake pedal and the transmission was in Drive. I started hearing a deep booming noise that made me wonder whether there was a big truck nearby, and then I realized it was my own van making the noise.

This noise seems abnormal, especially since this Caravan is equipped with Active Noise Cancellation (ANC) technology. Apparently, Chrysler intended the van to have a quiet interior.

Symptoms:

• Deep booming sound inside the cabin, not under the hood
• Occurs at warm idle in Drive or Reverse while stopped
• Usually begins after idling for roughly 30–90 seconds
• Gets noticeably worse when the A/C is switched on or off
• The noise is reduced in Neutral or Park, though it's still present
• Slightly increasing the RPM reduces the boom
• Switching from the foot brake to the parking brake makes no difference — so the brakes are not the cause

The boom frequency is about 32 Hz. The 3.6L Pentastar V6 engine has 3 firing events per crankshaft revolution. So 32 Hz corresponds to roughly 640 RPM — consistent with a warm idle. (640 Χ 3 χ 60 = 32.) This suggests that the noise source is likely the engine itself, transmitted into the cabin somehow.

The noise is unpleasant, but what also concerns me is the underlying cause. A brand-new vehicle shouldn't behave this way, and whatever is allowing engine vibration to enter the cabin might have adverse consequences beyond noise. For example, if the cause turns out to be mounts that are defective or improperly installed, that could affect powertrain alignment.

Here are some possible causes I've been investigating:

• Defective or misaligned engine, transmission, or torque mounts from the factory
• Exhaust contact or resonance with the body or floor
• Idle-control or PCM calibration issue
• ANC system malfunction (generating noise instead of cancelling it)
• A factory defect

How to reproduce the booming noise with your own van – if you have the same issue:

1. Warm the engine fully — the symptom does not occur when cold
2. Keep the van stationary with your foot on the brake
3. Shift into Drive
4. Let the van idle without touching the accelerator for up to 2 minutes
5. If nothing happens, slowly toggle the A/C on and off a few times
6. Listen for a deep low-frequency boom inside the cabin

My questions for the forum

1. Has anyone experienced this on a newer Pentastar minivan, especially one with ANC?
2. What diagnostic approach would you recommend?
3. Would Chrysler typically treat this as a warranty issue?
4. How should a mechanic diagnose and repair it?

Thanks in advance for any advice or shared experiences.