2019+ RAM 2500/3500 · 6.7L CUMMINS
2019+ 6.7 Cummins repair in Tucson: weak points & fixes.
The 2019+ Cummins is the strongest Ram diesel yet, with a new block and up to 1,075 lb-ft. A few problems are tied to certain years, like the 2019–2020 CP4 pump, plus the usual emissions and transmission wear. Here’s what we see and how we fix it at your location.
- 370–430 hp850–1,075 lb-ft stock
- CGI block2019–2024
- 68RFE · Aisin · 8-speedtransmissions
- We come to youTucson & nearby
Jump to a system
KNOW YOUR TRUCK
Which year? It changes the parts.
Fuel pumps and transmissions changed during this run. Your year and transmission tell us which parts to bring.
Fifth generation
- 370–420 hp / 850–1,075 lb-ft
- 2019–2020: Bosch CP4.2 pump (recall 21V-880)
- 2021–2024: CP3 pump returns
- 68RFE (standard output) or Aisin AS69RC (high output)
- Hydraulic lifters
High Output only
- 430 hp / 1,075 lb-ft
- TorqueFlite HD 8-speed automatic
- Fewer aftermarket parts so far
- Call us and we’ll check what fits
POWER THROUGH THE YEARS
Where the 2019+ 6.7 Cummins fits in Cummins history.
Peak factory pickup ratings by generation, horsepower and torque. Yours is highlighted. Tap any bar to see that generation.
- Horsepower
- Torque (lb-ft)
WEAK POINTS, SYSTEM BY SYSTEM
What fails on the 2019+ 6.7 Cummins, and how we fix it.
Tap a system to see what fails, what you’ll notice and how we fix it. Common = we see it often. Towing / tuned = shows up with heavy loads or added power. High miles = age and wear items.
Fuel system
CP4.2 pump wear (2019–2020)Common
You’ll notice: sudden stall or no-start, low rail pressure codes, metal in the filter.
Why: The CP4 pump on 2019–2020 trucks can wear and send metal through the fuel system. Ram issued recall 21V-880.
Our fix: We check recall status, test the fuel system and repair it; we can also discuss a CP3 conversion.
Water in the fuelCommon
You’ll notice: a water-in-fuel light, rough running.
Why: Water is hard on the pump and injectors.
Our fix: We drain and clean the system and change filters on time.
Engine
Grid heater boltCommon
You’ll notice: usually no warning before damage.
Why: A bolt on the intake grid heater can loosen and drop into the engine.
Our fix: We replace it with a Banks Monster-Ram and grid heater upgrade that removes the factory heater.
Lifter and cam wearHigh miles
You’ll notice: a tick or misfire, a check engine light.
Why: The 2019+ engine uses hydraulic lifters, which some trucks wear early.
Our fix: We diagnose the noise and repair the valvetrain.
EGR, DPF & DEF
EGR and DEF sensorsCommon
You’ll notice: a “Service DEF” message, derate, EGR codes.
Why: EGR valves clog with soot and DEF sensors fail, especially on 2019–2022 trucks.
Our fix: We diagnose and replace the failed part, keeping it legal.
Turbo vanes and actuatorHigh miles
You’ll notice: low or high boost codes, slow throttle response.
Why: Soot sticks the variable turbo’s vanes and the actuator can fail.
Our fix: We clean, repair or replace the turbo.
68RFE & Aisin
68RFE converter and clutch wearTowing / tunedCommon
You’ll notice: shudder, slipping, limp mode when towing.
Why: The 68RFE’s torque converter and clutches wear under heavy towing.
Our fix: We service it or install a built BD 68RFE and converter.
Aisin heat and fluidTowing / tuned
You’ll notice: high transmission temps, harsh shifts.
Why: The Aisin is strong but doesn’t like old fluid and heat.
Our fix: We service it on a towing schedule and add a deeper pan.
Front end & steering
Loose steering and death wobbleCommonHigh miles
You’ll notice: wandering, play in the wheel, a shake after a bump.
Why: The solid front axle wears out its track bar, tie rods and ball joints.
Our fix: We rebuild the front end with heavy-duty parts and set the alignment.
RELIABILITY UPGRADES
Bulletproof it in the right order.
If you plan to keep your 2019+ Cummins, these are the upgrades we recommend, in the order that protects it best.
- Grid heater fixA Banks Monster-Ram removes the factory grid heater before its bolt can fail.Call nowRequest a quote
- CP4 recall check (2019–2020)We confirm the recall is done and watch the fuel system.Call nowRequest a quote
- Fuel filters on timeClean, dry fuel protects the pump and injectors.Call nowRequest a quote
- Transmission coolingA deeper pan and fresh fluid help the 68RFE or Aisin live longer.Call nowRequest a quote
- Front endA healthy track bar and tie rods prevent death wobble.Call nowRequest a quote
MAINTENANCE SCHEDULE
2019+ 6.7 Cummins service intervals.
These are Ram’s factory intervals from the owner’s manual schedule. The factory “severe” column covers towing, dusty roads, short trips and long idling, which describes most working trucks in Southern Arizona. Our recommendation follows the severe schedule, with oil every 5,000 miles and fuel filters every 10,000.
| Service | Factory, normal use | Factory, severe use | Our recommendation |
|---|---|---|---|
| Engine oil & filter | Per the oil change indicator (15,000 mi / 6 months / 500 hours maximum on 2019) | Sooner, per the indicator | Every 5,000 mi |
| Fuel filters | 15,000 mi / 12 months | Same | Every 10,000 mi |
| Engine air filter | 30,000 mi / 24 months | Inspect at every oil change | Inspect at every oil change |
| Crankcase vent (CCV) filter | 75,000 mi / 60 months | Same | 75,000 mi / 60 months |
| Coolant flush | 150,000 mi / 120 months | Same | 150,000 mi / 120 months |
| 68RFE fluid & filters | 120,000 mi | 60,000 mi | 60,000 mi |
| Aisin AS69RC fluid & filter | 30,000 mi / 24 months | Same | 30,000 mi / 24 months |
| Transfer case fluid | 60,000 mi / 48 months | 30,000 mi / 24 months | 30,000 mi / 24 months |
| Front & rear axle fluid | Not set by the factory | 20,000 mi | 20,000 mi |
| Valve lash | Not required on 2019+ | Same | — |
Always go by your owner’s manual for your exact truck. 2025+ trucks with the 8-speed have their own schedule; ask us. Factory figures are maximums.
WANT MORE POWER?
2019+ 6.7 Cummins performance upgrades.
Staged builds, lift pumps, transmission, exhaust and suspension upgrades for the 2019+ 6.7 Cummins.
BUYING A 2019+ 6.7 CUMMINS?
Get it inspected before you buy.
Our Diesel Pre-Purchase Inspection checks the engine, fuel system, transmission and front end, and looks for signs of past problems. We meet you at the seller.
How mobile service worksTell us your truck and where it is, we diagnose on site, you approve a written estimate, and we fix it where it sits.
See how it works →PLAIN-ENGLISH GLOSSARY
2019+ 6.7 Cummins terms, explained.
- CGI block
- Compacted graphite iron. A stronger, lighter block used on 2019–2024 engines.
- CP4.2
- The fuel pump on 2019–2020 trucks, known for wear.
- CP3
- The tougher fuel pump that returned for 2021.
- Grid heater
- An intake heater that helps cold starts; its bolt can come loose.
- 68RFE
- The standard 6-speed automatic behind standard-output trucks.
- Aisin AS69RC
- The heavy-duty 6-speed automatic behind high-output trucks.
- DEF
- Diesel exhaust fluid. Sprayed into the exhaust to cut NOx.
Name-brand partsWe install proven brands like Banks, XDP, PPE, BD Diesel, Pacbrake and Bilstein.
See all the brands we install →OWNER QUESTIONS
2019+ 6.7 Cummins questions, answered.
Is my 2019 or 2020 Cummins a problem?
Those years have the CP4 pump. Make sure the recall is done and change fuel filters on time. Call us and we’ll check it.
What is the “killer grid heater bolt”?
A bolt on the factory intake heater can come loose and fall into the engine. A Banks Monster-Ram upgrade removes the factory heater.
Do you work on 2025 and newer trucks?
Yes, for maintenance and out-of-warranty repairs. Fewer aftermarket parts exist so far, so we check what fits your truck.
Why don’t you list prices for these repairs?
Every truck is different. Mileage, past repairs and how it’s used all change the parts and labor. Call us at 520-990-1033 and we’ll give you a straight quote.
What warranty do repairs have?
Repair labor is backed for 1 year or 12,000 miles, and new parts carry their manufacturer’s warranty. Warranty details →
LET’S TALK ABOUT YOUR TRUCK
Call, text or request a quote.
Tell us your year, mileage and what you want done. We’ll recommend the right repair, quote it and come to you.