RAM 2500 Truck 2WD L6-5.9L DSL Turbo VIN 7 (2001)
PROM - Programmable Read Only Memory: Customer Interest
ECM - Low Engine Power In Overdrive
NUMBER: 18-024-00
GROUP: Vehicle Performance
DATE: Dec. 21, 2000
SUBJECT:
Low Engine Power When The Automatic Transmission Is In Overdrive
OVERVIEW:
This bulletin involves selectively erasing and reprogramming the Cummins CM551 Engine Control Module (ECM) with new software (calibration
versions: 56T13, 59T6). There is no change to the JTEC PCM software.
MODELS:
NOTE:
THIS BULLETIN APPLIES TO VEHICLES EQUIPPED WITH A 5.9L-24V DIESEL ENGINE AND AUTOMATIC TRANSMISSION BUILT
BETWEEN ENGINE SERIAL NUMBERS 56666444 TO 56798357, WITH A DATE OF MANUFACTURE OF DEC. 15, 1999 TO NOV. 15,
2000. THIS INFORMATION IS AVAILABLE ON THE ENGINE DATA PLATE, WHICH IS LOCATED ON THE LEFT SIDE OF THE
ENGINE, AFFIXED TO THE SIDE OF THE TIMING GEAR HOUSING.
SYMPTOM/CONDITION:
The customer may complain of low engine power and/or poor performance. This engine condition may occur while the automatic transmission is being
operated in its overdrive gear. This condition may be further aggravated if the customer is using the vehicle for towing purposes.
The Engine Control Module (ECM) software, on a 2001 Ram Truck equipped with a 5.9L-24V diesel engine, is designed to "torque manage" the power
output of the engine. This is done to protect the automatic transmission components. The revised software calibration restores the power output and
improves the vehicle performance in overdrive.
NOTE:
IF TSB 18-015-00 REV A HAS PREVIOUSLY BEEN PERFORMED TO THE VEHICLE IN QUESTION, THEN THE ECM SOFTWARE HAS
ALREADY BEEN REVISED WITH THE CORRECT CALIBRATION TO ADDRESS THE ABOVE CONDITION. THE ECM WILL NOT
REQUIRE REPROGRAMMING.
DIAGNOSIS PROCEDURES:
Using the Mopar Diagnostic System (MDS2) and or the Diagnostic Scan Tool (DRB III(R)), with the appropriate Diagnostic Procedures Manual, verify
that all engine and transmission systems are functioning as designed. If Diagnostic Trouble Codes (DTC's) are present, record them on the repair order
and repair as necessary before proceeding further with this bulletin. If no DTC's are present, and the above symptom has been experienced, perform the
Repair Procedure.
PARTS REQUIRED:
EQUIPMENT REQUIRED:
NOTE:
