# Service bulletin 21\-018\-08

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: 10026168
- Published by NHTSA: 2008\-10\-03
- Manufacturer's number: 21\-018\-08
- Manufacturer's date: 2008\-07\-12
- NHTSA component: POWER TRAIN:AUTOMATIC TRANSMISSION

## NHTSA's summary

CHRYSLER/DODGE/JEEP: FLASH:DIAGNOSTIC TROUBLE CODE, DTC P0740 OR P1798 AND AUTOMATIC TRANSMISSION SHIFT IMPROVEMENTS 1\-2 OR 2\-3 COLD SHIFT IMPROVEMENTS. \*PE

## The document

No address for NHTSA's copy can be built for this communication. Ask the dealer for it by the manufacturer's number.

## Components

Transmission and driveline, Automatic transmission

## Trouble codes named

P0740, P1798

## Vehicles listed

- 2007 to 2008 CHRYSLER 300
- 2007 to 2008 CHRYSLER 300 AWD
- 2007 CHRYSLER 300C
- 2008 CHRYSLER DURANGO 4X4
- 2007 to 2008 DODGE CHARGER
- 2007 to 2008 DODGE DAKOTA
- 2008 DODGE DURANGO
- 2007 to 2008 DODGE MAGNUM
- 2008 DODGE NITRO
- 2008 DODGE RAM 1500
- 2008 DODGE RAM 2500
- 2008 DODGE RAM 3500
- 2008 DODGE RAM 4500
- 2008 DODGE RAM 5500
- 2008 HARLEY\-DAVIDSON TOURING
- 2008 JEEP LIBERTY
- 2008 JEEP WRANGLER
- 2008 JEEP WRANGLER 2\-DR 4X4
- 2008 JEEP WRANGLER 2\-DR 4X4 RHD
- 2008 JEEP WRANGLER 4\-DR 4X2
- 2008 JEEP WRANGLER 4\-DR 4X4

## Recalls for the same vehicles and component

- [09V436000](/recalls/nhtsa/09V436000.md), 2009-11-05: POWER TRAIN:AUTOMATIC TRANSMISSION
- [08V583000](/recalls/nhtsa/08V583000.md), 2008-11-06: POWER TRAIN:AUTOMATIC TRANSMISSION:LEVER AND LINKAGE:COLUMN SHIFT
- [06V341000](/recalls/nhtsa/06V341000.md), 2006-09-07: POWER TRAIN:AUTOMATIC TRANSMISSION

## Other bulletins for the same vehicles and component

- [S1121000006RevA](/bulletins/10221831.md), 2022-09-26, Service bulletin: POWER TRAIN:TRANSMISSION CASE/HOUSING; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\); ELECTRICAL SYSTEM. \(Revision A\) No Start No Crank ? Starter Will Not Engage And There Are No Related Codes Or Concerns
- [18\-021\-13](/bulletins/10188677.md), 2021-03-15, Service bulletin: ELECTRICAL SYSTEM; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\); ENGINE AND ENGINE COOLING. Flash: Performance Derate Above 55 MPH Immediately After Start\-Up When Accelerating At Wide Open Throttle This bulletin involves selectively erasing and reprogramming the Powertrain Control Module \(PCM\) with new software. A small number of customers may experience any of the following conditions: Performance derate above 55 MPH when accelerating at wide open throttle immediately following engine start\-up.
- [S1121000006 Rev.](/bulletins/10180221.md), 2020-09-28, Service bulletin: ELECTRICAL SYSTEM; ENGINE; POWER TRAIN:AUTOMATIC TRANSMISSION. \(Revision A\) No Start No Crank ? Starter Will Not Engage And There Are No Related Codes Or Concerns
- [18\-033\-14](/bulletins/10137030.md), 2018-05-21, Service bulletin: ELECTRICAL SYSTEM; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\). Flash: Powertrain System Improvements/Enhancements This bulletin involves selectively erasing and reprogramming the Powertrain Control Module \(PCM\) with new software. The following powertrain system improvements/enhancements are included in this software release: Improved Park to Reverse and Park to Drive Garage Shift Quality. Improved Pedal Response for Reverse to Drive and Drive to Reverse Shifts.
- [18\-021\-13](/bulletins/10136855.md), 2018-05-21, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\). Flash: Performance Derate Above 55 MPH Immediately After Start\-Up When Accelerating At Wide Open Throttle This bulletin involves selectively erasing and reprogramming the Powertrain Control Module \(PCM\) with new software. A small number of customers may experience any of the following conditions: Performance derate above 55 MPH when accelerating at wide open throttle immediately following engine start\-up.
- [WB\-D\-11\-25](/bulletins/10045081.md), 2012-08-17, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION:COOLING UNIT AND LINES. JEEP: SEE DOCUMENT SEARCH BUTTON FOR OWNER LETTER. INFORMATION REGARDING THE EXTENSION WARRANTY FOR DIAGNOSIS AND REPLACEMENT OF TRANSMISSION OIL COOLER LINES. \*PE
- [CSN\-L05](/bulletins/10041264.md), 2011-09-26, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION:COOLING UNIT AND LINES. CHRYSLER SERVICE CAMPAIGN: SEE DOCUMENT SEARCH BUTTON FOR OWNER LETTER. THE TRANSMISSION COOLER LINES MAY LEAK TRANSMISSION FLUID AT THE HOSE TO TUBE JOINTS. \*RM
- [SB\-21\-006\-11](/bulletins/10041077.md), 2011-09-20, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION:COOLING UNIT AND LINES. CHRYSLER: 2008\-2010 JEEP WRANGLER. WEEPING TRANSMISSION OIL COOLER LINES. INFORMATION ON INSTALLING NEW TRANSMISSION OIL COOLER SUPPLY AND RETURN LINE ASSEMBLY. \*RM
- [K39](/bulletins/10038199.md), 2011-06-09, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION. CHRYSLER SERVICE CAMPAIGN: SEE DOCUMENT SEARCH BUTTON FOR OWNER LETTER. SHIFT SPRING BREAKS CAUSING THE SHIFT LEVER TO BE UNABLE TO SHIFT FROM THE 'PARK' POSITION. \*RM
- [RRT\-08\-097](/bulletins/10028388.md), 2009-03-28, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION; STEERING:GEAR BOX \(OTHER THAN RACK AND PINION\). CHRYSLER:DODGE: APPROXIMATELY 2969 VEHICLES, EQUIPPED WITH AN AUTOMATIC TRANSMISSION, MAY HAVE BEEN SHIPPED WITH A GEARSHIFT CABLE THAT MAY SLIP OUT OF ADJUSTMENT AND NOT ALLOW LOW GEAR SELECTION. \*PE

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