# Service bulletin 11\-003\-21

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 10218570
- Published by NHTSA: 2022\-08\-22
- Manufacturer's number: 11\-003\-21
- Manufacturer's date: 2021\-08\-12
- NHTSA component: POWER TRAIN:DRIVELINE:DRIVESHAFT; STRUCTURE; ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:MANIFOLD/HEADER/MUFFLER/TAIL PIPE

## NHTSA's summary

Flutter or Rattle Noise From Under the Vehicle \- Exhaust Body Heat Shields This bulletin involves replacing all four exhaust heat shields specified in this bulletin. The customer may describe a rattle from underneath the vehicle.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10218570-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10218570-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Body and frame, Engine, Exhaust and emissions, Transmission and driveline, Driveshaft, Exhaust manifold, pipes and muffler

## Vehicles listed

- 2021 JEEP GRAND CHEROKEE

## Other bulletins for the same vehicles and component

- [S2121000014](/bulletins/10220724.md), 2022-09-26, Service bulletin: POWER TRAIN:DRIVELINE:DRIVESHAFT; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE:SOFTWARE; UNKNOWN OR OTHER. Service 4WD Message Illuminated. Diagnostic Trouble Code \(DTC\) C1472\-92 ? Transfer Case Clutch Control ? Performance or Incorrect Operation.
- [75227](/bulletins/10212436.md), 2022-05-31, Service bulletin: ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:MANIFOLD/HEADER/MUFFLER/TAIL PIPE; ENGINE AND ENGINE COOLING. MUFFLER AND TAILPIPE ? EXHAUST

JSON: [/v1/bulletins/10218570](/v1/bulletins/10218570)

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