1991 Cummins Diesel Engine Problems
Owner-reported complaints filed with NHTSA, grouped by component
Data refreshed
What this page shows
Everything below is an owner-reported complaint submitted to NHTSA about the 1991 Cummins Diesel Engine, grouped by the component NHTSA recorded on the report. These are not confirmed defects, and they are not recalls. NHTSA does not verify most reports before publishing them, and a category with more reports in it is not evidence that a part is defective.
Complaints are reports submitted by owners and drivers to NHTSA. They are not verified and do not establish that a defect exists.
Reports by component
Ranked by how many owner reports name each component category
- Other / unspecified444.4%
- Electrical222.2%
- Engine111.1%
- Fuel system111.1%
- Transmission111.1%
Percentages are of component mentions. A single complaint can name more than one component, so these do not sum to the total complaint count.
Each component in detail
What the reports in each category say, in the owners' own words
Other / unspecified
Reports whose component NHTSA recorded as unknown, or that do not map to one of the categories above.
From owner reports, verbatim
2016 RAM DIESEL 6.7 L EXPERIENCING STALLING WHEN DECELERATING TO STOP - LOSE POWER, RAN OFF ROAD AS RESULT. VEHICLE HAS 3 SECOND DELAY WHEN ATTEMPTING TO ACCELERATE- SERIOUS SAFETY CONCERN CAUSED SEVERAL NEAR MISSES
2004 DODGE RAM 3500. OUT OF PARK. VEHICLE DOES NOT GO ALL THE WAY INTO PARK, AND THE VEHICLE WILL ROLL AWAY WHEN YOU GET OUT. WE HAD A RECALL ON THIS PROBLEM ONLY TO NOW HAVE THE HORN BLAIR WHEN YOU ARE BACKING UP AND YOU HAVE THE DOOR OPEN TO GAGE THE DISTANCE. THIS STARTLED MY HUSBAND WHEN BACKING INTO A VERY CLOSE GARAGE SPACE, MAKING HIM HIT THE ACCELERATOR AND SMASH INTO THE SIDE OF THE GARAGE. WE HAVE BEEN TOLD BY DODGE IT IS NOT A PROBLEM WITH THE VEHICLE IT IS WITH THE OPERATORS OF THE VEHICLE. BUT ONLY THE OPERATORS OF 2004 AND 2005 RAM 2500 AND 3500 TRUCKS???????? NOT 1500 OR ANY OTHER TRUCKS. IT IS AMAZING TO ME THAT ONLY OWNERS OF 2004 & 2005 DODGE RAM 2500 AND 3500 TRUCKS ARE IDIOTS. *NM
Too few reports in this category for a page of its own — they appear in the full complaint list.
Electrical
Reports naming the electrical system — wiring, battery, charging, control modules, infotainment and electrical accessories.
From owner reports, verbatim
2016 RAM DIESEL 6.7 L EXPERIENCING STALLING WHEN DECELERATING TO STOP - LOSE POWER, RAN OFF ROAD AS RESULT. VEHICLE HAS 3 SECOND DELAY WHEN ATTEMPTING TO ACCELERATE- SERIOUS SAFETY CONCERN CAUSED SEVERAL NEAR MISSES
2004 DODGE RAM 3500. OUT OF PARK. VEHICLE DOES NOT GO ALL THE WAY INTO PARK, AND THE VEHICLE WILL ROLL AWAY WHEN YOU GET OUT. WE HAD A RECALL ON THIS PROBLEM ONLY TO NOW HAVE THE HORN BLAIR WHEN YOU ARE BACKING UP AND YOU HAVE THE DOOR OPEN TO GAGE THE DISTANCE. THIS STARTLED MY HUSBAND WHEN BACKING INTO A VERY CLOSE GARAGE SPACE, MAKING HIM HIT THE ACCELERATOR AND SMASH INTO THE SIDE OF THE GARAGE. WE HAVE BEEN TOLD BY DODGE IT IS NOT A PROBLEM WITH THE VEHICLE IT IS WITH THE OPERATORS OF THE VEHICLE. BUT ONLY THE OPERATORS OF 2004 AND 2005 RAM 2500 AND 3500 TRUCKS???????? NOT 1500 OR ANY OTHER TRUCKS. IT IS AMAZING TO ME THAT ONLY OWNERS OF 2004 & 2005 DODGE RAM 2500 AND 3500 TRUCKS ARE IDIOTS. *NM
Too few reports in this category for a page of its own — they appear in the full complaint list.
Engine
Reports naming the engine itself — including stalling, misfires, oil consumption, cooling and internal engine components.
From owner reports, verbatim
DIESEL EMISSIONS GETTING INTO CABIN AT TOXIC LEVELS. WHILE CLEANING OUT THE INSIDE OF MY DECEASED FATHERS F250 SUPER DUTY DIESEL, I NOTICED A BROWN HAZE COVERING THE THE FRONT SEAT AND NOTICED AT THE BOTTOM OF THE SEATBELTS, THEY WERE COVERED HEAVILY WITH DIESEL SOOT. I SENT OFF TO LAB FOR ANALYSIS AND THE RESULTS OF THE FIRST TEST WERE AS FOLLOWS: DIESEL RANGE ORGANIC GC/CARBON DISTRIBUTION 508MG/L. *AK
Too few reports in this category for a page of its own — they appear in the full complaint list.
Fuel system
Reports naming fuel storage or delivery — tanks, pumps, lines, injectors and fuel leaks.
From owner reports, verbatim
TWICE NOW, I HAVE BEEN DRIVING THIS TRUCK WHEN MY ENGINE SUDDENLY STALLED. 1. OCT. 2001 - WHILE DRIVING ON A MOUNTAIN ROAD (APPROXIMATELY 12% GRADE), THE ENGINE SUDDENLY STALLED. I WAS ABLE TO STOP USING THE EMERGENCY BRAKE. THIS OCCURRED ON A NARROW MOUNTAIN ROAD, IN HEAVY TRAFFIC. I DIRECTED TRAFFIC AROUND ME, AND THEN ATTEMPTED TO RESTART THE ENGINE. FORTUNATELY, IT STARTED, AND I DROVE IT TO THE DEALER. THE LIFT PUMP WAS REPLACED. (PART NUMBER 5015723AC PUMP) THE ODOMETER READ 33,329. I WAS ADVISED BY THE DEALERSHIP TO KEEP THE FUEL TANK AT LEAST HALF FULL. AT THE TIME OF THE FUEL PUMP FAILURE, THE TANK WAS OVER HALF FULL. 2. MAY 2005 '' I WAS ON A MOUNTAIN ROAD, GOING DOWNHILL. AFTER STOPPING AT A SIGNAL, WHEN I STARTED TO ACCELERATE, THE ENGINE WAS DEAD. AGAIN, THIS OCCURED IN HEAVY TRAFFIC. THIS TIME I HAD TO BE TOWED TO THE DEALER. ''CONFIRM COMPLAINT NO LIFT PUMP PRESSURE REPLACE D LIFT PUMP ENGINE STARTS BUT SETS CODE FOR INTERNAL SHORT IN INJECTION PUMP CAUSED BY FUEL STARVATION FROM LIFT PUMP REMOVE INJECTION PUMP AND REPLACE BLEED SYSTEM AND ROAD TEST.'' PART NUMBER 5080885AA-FUEL LINE BANJO PART NUMBER R5013925AA PUMP - FUEL INJECTION MILEAGE 84,754 '' THE FUEL TANK WAS THREE-QUARTERS FULL. THIS IS A SERIOUS SAFETY ISSUE. IF I WAS TRAVELING AT FREEWAY SPEED WHEN THESE FAILURES OCCURRED, THE CONSEQUENCES MIGHT HAVE BEEN SERIOUS '' FOR MYSELF AND OTHERS CLOSE BY.
Too few reports in this category for a page of its own — they appear in the full complaint list.
Transmission
Reports naming the automatic or manual transmission, including shifting behaviour, shudder, slipping and transmission control modules.
From owner reports, verbatim
2004 DODGE RAM 3500. OUT OF PARK. VEHICLE DOES NOT GO ALL THE WAY INTO PARK, AND THE VEHICLE WILL ROLL AWAY WHEN YOU GET OUT. WE HAD A RECALL ON THIS PROBLEM ONLY TO NOW HAVE THE HORN BLAIR WHEN YOU ARE BACKING UP AND YOU HAVE THE DOOR OPEN TO GAGE THE DISTANCE. THIS STARTLED MY HUSBAND WHEN BACKING INTO A VERY CLOSE GARAGE SPACE, MAKING HIM HIT THE ACCELERATOR AND SMASH INTO THE SIDE OF THE GARAGE. WE HAVE BEEN TOLD BY DODGE IT IS NOT A PROBLEM WITH THE VEHICLE IT IS WITH THE OPERATORS OF THE VEHICLE. BUT ONLY THE OPERATORS OF 2004 AND 2005 RAM 2500 AND 3500 TRUCKS???????? NOT 1500 OR ANY OTHER TRUCKS. IT IS AMAZING TO ME THAT ONLY OWNERS OF 2004 & 2005 DODGE RAM 2500 AND 3500 TRUCKS ARE IDIOTS. *NM
Too few reports in this category for a page of its own — they appear in the full complaint list.
Higher-selling and older vehicles accumulate more reports. Counts are not failure rates and are not directly comparable between vehicles that sold in very different numbers.
Elsewhere on this vehicle
Data sources
- NHTSA Office of Defects Investigation — owner-reported complaints and the components recorded on them
Data on this page last refreshed .