RAM 2500 Truck 2WD L6-5.9L DSL Turbo VIN 7 (2001)
PROM - Programmable Read Only Memory: All Technical Service Bulletins
A/T - Reliability Concerns For Extreme Cold Operation
NUMBER: 21-004-01
GROUP: Transmission
DATE: Feb. 16, 2001
SUBJECT:
Overdrive Disabled To Improve Transmission Reliability During Cold Temperature Operation
OVERVIEW:
This bulletin involves selectively erasing and reprogramming the Powertrain Control Module (PCM) with new software (calibration level 01Cal14).
MODELS:
2001 (BR/BE) Ram Truck
NOTE:
THIS BULLETIN APPLIES TO VEHICLES: EQUIPPED WITH AN RE AUTOMATIC TRANSMISSION, THE VEHICLE WAS BUILT ON OR
BETWEEN JUNE 26, 2000 (MDH0626XX) AND DECEMBER 23, 2000 (MDH 1223XX), AND THE PCM SOFTWARE LEVEL IS EARLIER
(LOWER) THAN CALIBRATION 14 FOR MODEL YEAR 2001.
SYMPTOM/CONDITION:
Quality analysis has determined that insufficient lubrication of certain internal transmission components may occur when a vehicle is operated in
temperatures lower than -20°C (-5F). This condition may be caused by the automatic transmission fluid (ATF) freezing in the cooler lines and
interrupting the flow of lubricating oil (ATF) to the transmission overdrive unit. This condition should only be a concern in areas where very cold
ambient temperatures of -20°C (-5°F) are experienced.
The revised software will not allow 4th gear overdrive to occur if ambient temperatures are less than -20°C (-5F). The revised PCM software has been
implemented to improve transmission reliability. The customer should be informed that reduced fuel economy would be expected when overdrive is not
in use.
DIAGNOSIS:
1.
Verify the calibration level of the PCM software. If the PCM software level is at 2001 Calibration 14, or higher, this bulletin does not apply.
2.
Perform the Repair Procedure if vehicle operation occurs in ambient temperatures which are less than -20°C (-5°F) and if the PCM software level
is earlier (lower or less) than 2001 Calibration 14.
PARTS REQUIRED:
EQUIPMENT REQUIRED:
NOTE:
THE MDS2 MUST BE OPERATING AT CIS CD 2077 OR HIGHER.
REPAIR PROCEDURE:
1.
Reprogram the PCM using the MDS2 (Mopar Diagnostic System) and the DRBIII(R) (Scan Tool).
NOTE:
