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Hemi platform

Ram 6.4L HEMI Gasoline (Ram HD 2019+)

2019-present · 6.4L · Stellantis

40

vehicle configs

6

failure modes

27

parts

3

recipes

recalls + bulletins →

symptoms compared →

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Failure modes

Cooling service (water pump / thermostat)

EGR valve carbon (gas EGR service surface)

Exhaust manifold bolt failure / leaks (HEMI tick source #1)

Fuel delivery service (in-tank pump / PFI injectors)

Ignition service wear (plugs / coils)

Lifter / cam wear (HEMI tick source #2)

Parts

6.4L HEMI Camshaft Position Sensor (OEM) part-h64-camshaft-sensor 6.4L HEMI Coolant Temperature Sensor (OEM) part-h64-coolant-temp-sensor 6.4L HEMI Crankshaft Position Sensor (OEM) part-h64-crankshaft-sensor ram-hemi-6_4: emissions (service item) part-h64-egr-service 6.4L HEMI Exhaust Manifold Bolt (OEM) part-h64-exhaust-manifold-bolt 6.4L HEMI Exhaust Manifold Gasket (OEM) part-h64-exhaust-manifold-gasket 6.4L HEMI Exhaust Manifold Gasket, 2019-2021 (OEM) part-h64-exhaust-manifold-gasket-1921 6.4L HEMI Exhaust Manifold, left (OEM) part-h64-exhaust-manifold-left 6.4L HEMI Exhaust Manifold, left, 2019-2021 (OEM) part-h64-exhaust-manifold-left-1921 6.4L HEMI Exhaust Manifold, right (OEM) part-h64-exhaust-manifold-right 6.4L HEMI Exhaust Manifold, right, 2019-2021 (OEM) part-h64-exhaust-manifold-right-1921 6.4L HEMI Fan Clutch (OEM) part-h64-fan-clutch 6.4L HEMI Fuel Pump / Sender Module, 2019-2021 (OEM) part-h64-fuel-pump-1921 6.4L HEMI Fuel Pump / Sender Module, 2021+ (OEM) part-h64-fuel-pump-2126 6.4L HEMI Head Gasket (OEM, per bank) part-h64-head-gasket 6.4L HEMI Ignition Coil (OEM) part-h64-ignition-coil 6.4L HEMI Valve Lifter (OEM, all-years listing) part-h64-lifter-68447565 6.4L HEMI Hydraulic Roller Lifter, deactivating (MDS, OEM) part-h64-lifter-deactivating 6.4L HEMI Hydraulic Roller Lifter, standard yoke (OEM) part-h64-lifter-standard 6.4L HEMI Oil Pressure Sensor (OEM) part-h64-oil-pressure-sensor 6.4L HEMI Oxygen Sensor, front (OEM) part-h64-oxygen-sensor-up Ram 2500/3500 In-Tank Lift Pump Upgrade, 50-gal tank (Fleece PowerFlo, 2020-2024) part-h64-powerflo-lift-pump-50gal 6.4L HEMI Push Rod (OEM) part-h64-push-rod 6.4L HEMI Rocker Arm (OEM, per position) part-h64-rocker-arm-pair 6.4L HEMI Spark Plug (OEM) part-h64-spark-plug 6.4L HEMI Thermostat Housing (OEM) part-h64-thermostat-housing 6.4L HEMI Valve Cover Gasket (OEM) part-h64-valve-cover-gasket

Recipes

Exhaust manifold repair for the 6.4L HEMI (mode fm-h64-exhaust-manifold-bolts) - the platform's signature failure: manifold bolts stretch/break and the leak reads as a cold-start tick

Ignition service for the 6.4L HEMI (mode fm-h64-ignition-service): 16 plugs on the OHV V8, one coil per cylinder, MDS runs under the covers

Lifter/valvetrain repair for the 6.4L HEMI (mode fm-h64-lifter-cam-wear): the 6.4 HAS MDS - deactivating lifters (5038788AD) sit beside standard ones (5038787AD), and a failed deactivating lifter reads as a cold-start tick plus an MDS DTC

From the blog

Problem explainerRam 6.4L HEMI Gasoline

HEMI Tick in a Ram 2500/3500: Lifter Failure or Exhaust Manifold Bolts?

September 24, 2026 · 16 min read

Vehicle configurations