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Diesel specialists · Colorado Springs
Cummins Diesel Repair & Service in Colorado Springs
Ram 2500 through 5500 with the 5.9L and 6.7L Cummins — every generation from the 12-valve to today. Factory-level diagnostics and programming in our own shop, and repairs that fix the cause, not just the symptom.
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✓ 24-month / 24,000-mile warranty
✓ ASE-certified technicians
✓ Female-led, family-owned
What we do
Cummins diagnostics, service and repair
One shop for your diesel, from the first warning light to the finished repair.
01
Diagnostics & programming
We read Cummins-specific codes and live data to find the root cause of a no-start, a power loss or smoke — the first time.
✓ Factory-level diagnostics
✓ J2534 pass-thru programming with factory software, in-house
✓ Fuel pressure and injector testing
✓ Photo and video of every finding
02
Diesel maintenance
Service that keeps a Cummins from becoming a big repair.
✓ Fuel filters and water separator service
✓ Coolant service for towing at altitude
✓ DEF and DPF system service
✓ Transmission fluid service
03
Repair
Durable repairs on the parts each Cummins is known to wear out.
✓ VP44, CP3 and CP4 fuel pumps — and lift pumps
✓ Injectors on the 5.9L and 6.7L
✓ Turbo and VGT repair
✓ EGR, DPF and DEF repair — never deletes
Generation by generation
What are the most common problems on each Cummins?
Every Cummins generation has its own weak spots. This is what we see most in our bays.
5.9L 12-valve
1989–1998
• Killer dowel pin check
• Lift pump wear
• Very durable mechanical injection
5.9L 24-valve
1998.5–2002
• VP44 injection pump failure
• Weak lift pump starving the VP44
• Killer dowel pin check
5.9L common rail
2003–2007
• Injector wear — smoke and rough idle
• Fuel supply and pressure faults
• Front end wear from diesel weight
6.7L
2007.5–2012
• DPF and regen problems
• EGR system faults
• Turbo / VGT issues
6.7L
2013–2018
• DEF and NOx sensor faults
• DPF and regen problems
• Exhaust manifold bolt breakage
6.7L
2019–present
• CP4 fuel pump concerns
• DEF system faults
• Front axle u-joint wear
Keep it healthy
What we tell Cummins owners
• Change fuel filters on schedule
• Drain the water separator
• Check the lift pump on older trucks
• Don't ignore a regen that never finishes
Cummins questions we answer every week
Straight answers from our techs
Why won't my 24-valve 5.9L Cummins start?
On 1998.5–2002 24-valve Cummins engines, a no-start or stall is often a failing VP44 injection pump — frequently after a weak lift pump has starved it of fuel.
Warning signs
Hard start or no start · Stalling · Loss of power · Pump codes
What we do
We test fuel supply pressure and the VP44, then replace what failed — including the lift pump if it caused it.
What is the killer dowel pin on a 5.9L Cummins?
On 1989–2002 5.9L Cummins engines, a small dowel pin in the timing case can back out and fall into the gear train. Most owners never know it's there until it causes damage.
Why it matters
Hidden until it fails · Can damage the timing gears · A simple preventive fix
What we do
We inspect it and install a tab kit to lock the pin in place — a small job that prevents a big one.
Why is my 5.9L common-rail Cummins smoking and idling rough?
On 2003–2007 common-rail 5.9L engines, smoke and a rough idle usually point to worn injectors or a fuel supply problem.
Warning signs
White or black smoke · Rough idle · Misfire · Hard starting · Poor fuel economy
What we do
We test fuel pressure and injector contribution to find the real cause before replacing parts.
Should I worry about the CP4 pump on my 2019+ Cummins?
Starting in 2019, the 6.7L Cummins moved to a CP4 high-pressure fuel pump. When a CP4 fails it can send metal through the fuel system, so fuel quality and filter changes matter.
Warning signs
Hard start · Loss of power · Stalling · Low rail pressure codes
What we do
We keep up fuel filter service and water separation, and diagnose any fuel-pressure fault before it spreads.
Colorado Springs: If it stalls or loses power, stop driving it — running it can spread the damage.
Why is my 6.7L Cummins regenerating all the time?
On the 6.7L Cummins, frequent regens usually trace to a clogged DPF, a bad sensor, or EGR problems — often made worse by lots of short trips.
Warning signs
Frequent regens · DPF warning · Reduced power mode · Poor fuel economy
What we do
We diagnose the sensors and the system, run a service regen when appropriate, and repair what failed. We repair emissions systems — we don't delete them.
Why is my 6.7L Cummins losing power when towing?
Power loss on a 6.7L is often the turbo — a sticking VGT or actuator — or a boost leak. Exhaust restrictions from a clogged DPF can do it too.
Warning signs
Loss of power · Slow spool · Black smoke · Check engine light
What we do
We test boost and the VGT, then clean, repair or replace the turbo — or fix the leak or restriction behind it.
Colorado Springs: Towing up long grades is when a sticking turbo shows up first.