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TSB 21-11-95

Overdrive Unavailable In Extreme Cold Ambient Temperatures

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Date: Jul. 7, 1995

Models: 1996 (BR) Ram Truck

1996 (AB) Ram Van/Wagon
1996 (AN) Dakota
1996 (BR) Ram Truck
1996 (ZJ) Grand Cherokee

NOTE:   THIS BULLETIN APPLIES TO VEHICLES EQUIPPED WITH RWD TRANSMISSIONS 42RE, 44RE, 46RE, AND 47RE.

Discussion:

In ambient temperatures of minus 5 degrees F and below, the Powertrain Control Module (PCM) will electronically inhibit the transmission from shifting into overdrive. This will protect the transmission from damage if the automatic transmission fluid begins to freeze. This is a new feature for the 1996 model year.

The PCM will allow overdrive operation once the ambient temperature has risen approximately 7 degrees above the temperature the transmission overdrive was inhibited at, or an ambient temperature of + 2 degrees F, whichever occurs first.

NOTE: THE PCM USES A DIFFERENT TEMPERATURE SENSOR TO MONITOR THE OVERDRIVE DISCONNECT THAN THE OVERHEAD CONSOLE. DO NOT ATTEMPT TO MONITOR THE OVERDRIVE DISCONNECT WITH THE OVERHEAD CONSOLE.

Notes: 

Policy:    Information Only


Thanks to Barry Drodge for supplying this TSB information

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This page was edited on: May 3, 2004