Allpar HomeMore NewsCarsTrucksUpcomingRepairsReviews

Pentastar head issue in depth

Automotive News’ Larry Vellequette has published a definitive article on Pentastar engine failures, following Allpar’s reporting of the issue in June.

Allpar.com had broken the story on June 25th, 2012, but did not get an official reaction from Chrysler or more details on the story. The problem affected a small proportion of Pentastar V-6 engines, and did not leave customers stranded; when the check engine light activated and customers took their cars to the dealer, they were given loaners, in some cases for weeks, while Chrysler researched the problem and developed a stronger head. The heads were immediately used on new Pentastar V6 engines, with service parts being run in bursts between regular production.

According to Vellequette’s story, over 1,300 vehicles were affected at one point; around 500 new cases are developing each week. The problem appears to affect around 1% f the engines made, and results in a ticking sound, with stalling in some cases, along with illumination of the check engine light. Chrysler blamed the issue on “an unusual combination of factors,” including low quality fuel.

Chrysler does not appear to have run a large number of replacement heads for cars at dealerships until contacted by Automotive News.

Quoted in the article, Chrysler’s head of engineering, Bob Lee, said that excessive heat was not an issue; the Pentastar is unusual in that the exhaust has a single outlet from the heads before reaching the exhaust manifold. The new heads are now used on all Pentastar engines.

[No ad here today]
Demon drag racing image
Demon chillin’ the intercooler
2018-jl-wranglerunlimited-rubicon1
This really is the 2018 Wrangler “JL”

Red vs black keys: Real-world Hellcat performance

More Mopar Car
and Truck News

Here’s a quick site map...

The cars.

The most popular pages

(More to come)



At Allpar


Driving the Dodge SlingShot

Mopar 3.9 V6

2010-2014 Chrysler 200


The next Jeep Compass



Staff details/contactsTerms of ServiceInformation is presented to the best of our knowledge. Plans change and sometimes mistakes are made. Decisions or purchases made based on this site's verbiage or images are done at the reader's own risk. Also see the Allpar News archives, 1997-2008 • Copyright © 2008-2017, Allpar LLC. All rights reserved. • Mopar, Dodge, Jeep, Chrysler, HEMI, and certain other names are trademarks of Fiat Chrysler Automobiles.