Failure mode - Ram ProMaster 3.6L Pentastar V6 (2014-2025)

'Pentastar tick': rocker arms, hydraulic lash adjusters, cam damage

Reliability tier: aggregated - verify before ordering, see /disclosure/

Symptoms

ticking/tapping from the top end that persists warm
misfires or power loss as a follower collapses
metallic debris at oil services in advanced cases (cam damage)

Compare with the other causes of the same sign on this engine: loss of power, limp mode or derate (2 causes) · ticking, knocking, rattle or whine · misfire, rough idle, hesitation or surging (2 causes) · metal in the fuel filter or oil

Root cause

Rocker arms and hydraulic lash adjusters wear and tick; a failed follower can chew its cam lobe. An FCA class action (filed January 2022, Delaware) alleges a valvetrain defect across 3.6 Pentastar vehicles - documentary context for the pattern. The 2011-2013 left-cylinder-head cracking issue predates the ProMaster (the van only ever carried the updated post-2013 head) - but the tick diagnosis still starts with a compression/leak-down test before condemning the valvetrain.

Diagnosis

locate the tick per cylinder (hose/stethoscope); rule out exhaust leaks first
compression and leak-down before pulling the valve cover
inspect rockers and lash adjusters at the suspect cylinder; check the cam lobe

Fixes

rocker arm / lash adjuster replacement; camshaft replacement where a lobe is damaged ()

valvetrain - more than one option: 3.6 Pentastar Camshaft, intake (68172837AA), 3.6 Pentastar Hydraulic Lash Adjuster (5184332AA), 3.6 Pentastar Rocker Arm (5184296AH, current)

Prevalence

common