# Service bulletin 21\-004\-13

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: 10188672
- Published by NHTSA: 2021\-03\-15
- Manufacturer's number: 21\-004\-13
- Manufacturer's date: 2013\-05\-10
- NHTSA component: ELECTRICAL SYSTEM; POWER TRAIN:TRANSFER CASE \(4\-WHEEL DRIVE\); ENGINE AND ENGINE COOLING

## NHTSA's summary

Flash: Drivetrain Control Module \(DCTM\) \- Transfer Case Operational Enhancements This bulletin involves flashing the Drivetrain Control Module \(DCTM\) Owners may indicate that they have experienced one or more of the following symptoms: Moaning or groaning noise while coasting and/or during a very light acceleration around 5 to 8 mph \(8 to 13 kph\). The SERV 4WD message appears and the vehicle shifts from 4WD to 2WD. Binding of the front driveline while turning on steep grades at speeds around 3 to 5 mph \(5 to 8 kph\).Surge/Shudder at speeds greater than 50 mph \(80 kph\).

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2013/MC-10188672-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2013/MC-10188672-9999.pdf)

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

## Components

Electrical system, Engine, Transmission and driveline, Transfer case

## Vehicles listed

- 2011 DODGE DURANGO
- 2011 JEEP GRAND CHEROKEE

## Other bulletins for the same vehicles and component

- [21\-003\-13](/bulletins/10188673.md), 2021-03-15, Service bulletin: EQUIPMENT; POWER TRAIN:TRANSFER CASE \(4\-WHEEL DRIVE\); ELECTRICAL SYSTEM. Flash: Drivetrain Control Module \(DCTM\) \- Transfer Case Operational Enhancements This bulletin involves flashing the Drivetrain Control Module \(DCTM\) Owners may indicate that they have experienced one or more of the following symptoms:A driveline bump is felt during acceleration at approximately 10 mph \(16 kph\).The SERV 4WD message appears and the vehicle shifts from 4WD to 2WD.Binding of the front driveline while turning on steep grades at speeds around 3 \- 5 mph \(5 \- 8 kph\).

JSON: [/v1/bulletins/10188672](/v1/bulletins/10188672)

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