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CriticalCommonEngine

Jeep Wrangler: 3.6L Pentastar V6 Rocker Arm and Valve Train Failure

3.6L Pentastar V6 Rocker Arm and Valve Train Failure is a common engine fault on the Jeep Wrangler on the 2012–2018 cars, and we rate it critical. Putting it right costs $900 to $4,500 at New Zealand independent workshop rates. Below is what goes wrong, the symptoms to notice on a test drive, where to look, and what to ask the seller before you hand over any money. It is one of 24 documented faults on the Jeep Wrangler.

Vehicle
Jeep Wrangler
Engine
3.6L
Years
2012–2018
Fuel
petrol
System
Engine

This page covers the Jeep Wrangler as a model. Some faults only affect particular engines or build years — enter a plate below to narrow the list to one car.

All Jeep Wrangler faults24 documented faults on this model

What you are looking at

No photograph available

We do not hold a verified photograph for this fault yet. We would rather show none than show a picture of something else.

What goes wrong

The 3.6L Pentastar V6 in JK Wranglers from 2012 onward is subject to rocker arm follower failure, in which the plastic follower body cracks or fragments and causes valve train noise, misfires, or catastrophic valve damage. NHTSA investigated this as a safety defect and Chrysler issued TSBs. Affected engines develop a distinctive ticking or tapping noise before mechanical failure. Oil quality and change intervals significantly affect severity.

What you would notice

  • Persistent tapping or ticking from valve cover area
  • Misfire codes (P030x) with no ignition system fault
  • Check engine light with cylinder-specific misfire
  • Reduced power and rough idle
  • Metal particles in engine oil

How to check it

Where to look. Cylinder heads, top of engine, both cam banks (V6)

  1. Start engine cold and listen for valve train tick from top of engine.

  2. Scan for misfire codes before clearing.

  3. Check oil for metallic contamination.

  4. Ask for oil change frequency — 5,000 km intervals are minimum for this engine.

  5. Have a mechanic inspect via valve cover removal if tick is present.

What it costs to put right

$900 to $4,500 at New Zealand independent workshop rates. That is for this job on its own, not for the car.

An estimate, in NZD, for the repair as normally carried out. What a specific car costs depends on which part has failed and what it damaged on the way — treat this as the floor for a negotiation, not a quote.

Ask the seller

  • “Has the engine ever had a ticking or tapping noise?”
  • “Have any check engine lights or misfire codes appeared?”
  • “How often was the oil changed and with what grade?”

Now check the Jeep Wrangler you are actually looking at

Everything above is true of the model, and it is free. What it does not tell you is whether THIS car has been looked after: its odometer history and whether the reading has ever gone backwards, whether there is still money owing on it, whether it has been reported stolen, how many owners it has had and what it is really worth today. That comes from the official records for that plate. Enter the plate for the free details, or get the full history and a market valuation from $13.49.

Not sure what you would be paying for? See what a full KickTyres check includes.

Where this comes from

The failure described above is documented in published sources — owner forums, technical service bulletins, recall notices and workshop write-ups — held in our fault database. The inspection instructions and the cost estimate are KickTyres’ own interpretation of them, and it is a starting point for an inspection rather than a manufacturer statement.

Jeep Wrangler buyer questions

Is 3.6l pentastar v6 rocker arm and valve train failure serious on a Jeep Wrangler?

We rate it critical and common on the Jeep Wrangler. The 3.6L Pentastar V6 in JK Wranglers from 2012 onward is subject to rocker arm follower failure, in which the plastic follower body cracks or fragments and causes valve train noise, misfires, or catastrophic valve damage. NHTSA investigated this as a safety defect and Chrysler issued TSBs. Affected engines develop a distinctive ticking or tapping noise before mechanical failure. Oil quality and change intervals significantly affect severity.

How much does it cost to fix on a Jeep Wrangler?

$900 to $4,500 at New Zealand independent workshop rates. That figure is for this job on its own. A car showing the symptoms on this page is usually worth either walking away from or negotiating down by at least the repair figure.

Which Jeep Wrangler years are affected?

Our research records this fault on the 2012–2018 Jeep Wrangler. Build dates move around, especially on imported cars, so treat the range as the years to look hardest at rather than a guarantee either way. The official records tell you the exact build and first registration date for the car in front of you.

How do I check for it before I buy?

Start engine cold and listen for valve train tick from top of engine. Scan for misfire codes before clearing. Check oil for metallic contamination. Ask for oil change frequency — 5,000 km intervals are minimum for this engine. Have a mechanic inspect via valve cover removal if tick is present. Look here: Cylinder heads, top of engine, both cam banks (V6)