2019-2024 6.7L Cummins Applicable Products

The CP4.2 high-pressure fuel pump is the most notorious failure point on 2019–2022 6.7L Cummins—contaminated fuel causes the pump to metal-shed and destroy the fuel system. Symptoms: white smoke, low fuel rail pressure codes (P0087/P0191), and sudden power loss. Prevention: use SPELAB fuel filtration upgrades and avoid low-quality diesel. Running a delete tune does not fix the CP4.2 issue—fuel quality is the primary variable.

No—not for any on-road use in the U.S. The 2019–2022 Ram 6.7L uses SCR (Selective Catalytic Reduction) with DEF, making full delete kits (DPF + EGR + DEF) more complex than older platforms. Federal law prohibits removing certified emissions equipment from highway vehicles. Delete kits are strictly off-road/race use. If you need emissions compliance, an EGR delete without removing the DPF is a partial option in most states.

The factory 6.7L Cummins intake manifold is a common failure point—cracking around the intake horn causes boost leaks and unmetered air (P0101/P0299 codes). The SPELAB 3.5" intake manifold with integrated grid heater element ($199.00, rated 4.87 from 31 reviews) replaces the weak plastic unit with cast aluminum. It eliminates the cracking failure mode and provides a cleaner air path for higher-horsepower builds.

The Mini Maxx V2 ($999, rated 4.91 from 11 reviews) and EFILive AutoCal V3 ($1,050) are the two main tuners on SPELAB for 2019–2022 Cummins. Mini Maxx runs simpler plug-and-play tuning with pre-loaded delete tunes. EFILive offers more granular control over fuel curves, transmission tuning, and data logging. For most owners, Mini Maxx V2 is the better value. EFILive is preferred for custom tuning on heavily modified trucks.

Yes. The 6.7L Cummins thermal bypass valve controls coolant flow to the intake manifold and is a known leak point on 2013–2024 models. A failed unit causes overheating, low coolant warnings, and in severe cases, warped intake manifolds. SPELAB's thermal bypass valve ($69.99, rated 4.5 from 4 reviews) is a direct replacement for the factory unit—simple install, prevents costly manifold damage down the line.