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2.4 JTD / JTDm Multijet vs Isuzu 2.5 / 3.0 / 1.9 Ddi: which engine is more reliable?

According to our risk index, the 2.4 JTD / JTDm Multijet carries less risk than the Isuzu 2.5 / 3.0 / 1.9 Ddi: 25/100 versus 43/100 (both moderate risk). The 2.4 JTD / JTDm Multijet has no documented serious faults; the Isuzu 2.5 / 3.0 / 1.9 Ddi has 2 documented serious faults, the main one being «Broken teeth on the camshaft gear (2017 campaign)».

Risk index

2.4 JTD / JTDm Multijet

25

Moderate risk · 0 serious faults

Lower risk

Risk index

Isuzu 2.5 / 3.0 / 1.9 Ddi

43

Moderate risk · 2 serious faults

The index (0–100) weights the severity and frequency of the three most serious documented faults. How it is calculated

18 sourcesHow we work

Is the 2.4 JTD / JTDm Multijet reliable?

The five-cylinder 2.4 JTD/JTDm is powerful but more delicate in its 20V version. Auto Świat says the 10V rarely breaks down on its own; on the 20V, owner testimonies for the 200 and 210 hp Alfa 159 pile up mentions of the EGR and particulate filter, and the 200 hp had the manifold flap failure that Fiat corrected in 2007.[1][2]

See the 4 of the 2.4 JTD / JTDm Multijet faults

Is the Isuzu 2.5 / 3.0 / 1.9 Ddi reliable?

These are the diesels of the Isuzu D-Max: the 2.5 twin-turbo (4JK1) and the 1.9 Ddi (RZ4E) of the European range, and the 2.5 and 3.0 of the Latin American Chevrolet D-Max. Auto Express speaks of enviable reliability; what is documented is diesel in the oil of the 2.5 on short journeys, soot in the EGR and a 2017 campaign for the camshaft gear.[3][4][5][6]

See the 3 of the Isuzu 2.5 / 3.0 / 1.9 Ddi faults

Side-by-side comparison

Comparison of 2.4 JTD / JTDm Multijet and Isuzu 2.5 / 3.0 / 1.9 Ddi
2.4 JTD / JTDm MultijetIsuzu 2.5 / 3.0 / 1.9 Ddi
Technical data
TypeEngineEngine
FuelDieselDiesel
Displacement2,387 cm³—
TimingTiming belt (dry)Gears
Power136–210 hp117–177 hp
Production1998–2011[1][7][8][9][10]since 2012[6][11][12][13]
Reliability
Risk index (what is it?)25Moderate risk43Moderate risk
Documented faults43
Of high or critical severity02
Worst severityMedium severityCritical severity
Main faults
  1. Medium severity: Intake manifold flap failure (swirl flaps)
  2. Medium severity: Clogged or faulty EGR valve on the 2.4 JTD and JTDm
  3. Medium severity: Injector failure and diesel leaks on the 2.4 JTDm
  1. Critical severity: Broken teeth on the camshaft gear (2017 campaign)
  2. High severity: Diesel in the oil and clogged particulate filter on short journeys
  3. Medium severity: EGR valve blocked by soot
Most expensive documented repairup to €800Clogged or faulty EGR valve on the 2.4 JTD and JTDmPublished figure[14]No reliable data
Which versions to buy
BuyRecommended versions
  • 1.9 Ddi 163 hp (RZ4E, European D-Max from 2017)[3][6]
With cautionVersions to be cautious about
  • 2.4 JTDm / Multijet 20V (175-185 hp, 2003-2009)[1][15]
  • 2.4 JTDm / Multijet 20V 200 hp (2005-2011)[1][2]
  • 2.4 JTDm 20V 210 hp (Alfa Romeo, 2007-2010)[1][2][16][17]
  • 2.5 TD twin-turbo 163 hp (4JK1, European D-Max 2012-2017)[4][6]
  • 2.5 and 3.0 TD (4JK1 and 4JJ1, Latin American Chevrolet D-Max 2012-2020)[5][18]
AvoidVersions to avoidNoneNone

Severity of each fault: green, low; amber, medium; red, high; dark red, critical. How we rate them

Cars that each one is fitted to

2.4 JTD / JTDm Multijet

See the 7 models with the 2.4 JTD / JTDm Multijet

Isuzu 2.5 / 3.0 / 1.9 Ddi

Other comparisons

With the 2.4 JTD / JTDm Multijet

With the Isuzu 2.5 / 3.0 / 1.9 Ddi

Compare other engines

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Sources

Every fact on this page links to its source. If you find an error, let us know.

  1. Silnik 2.4 JTD: mocny i trwały, ale czasem też kapryśnyAuto Świat · Motoring press · published 26 September 2011 · consulted 8 October 2026 · in another language
  2. Fiabilité Alfa-romeo 159 (2005-2012) (428 témoignages)Fiches-auto.fr · Owners' forum · consulted 8 October 2026 · in French
  3. Isuzu D-Max reviewAuto Express · Motoring press · published 16 October 2026 · consulted 2 November 2026
  4. Tips for buying a second-hand pickup: Isuzu D-MaxFarmers Weekly · Motoring press · published 17 December 2020 · consulted 2 November 2026
  5. Isuzu MU-X & D-Max common problems and solutionsUnsealed 4X4 · Motoring press · published 12 June 2026 · consulted 2 November 2026
  6. Isuzu D-Max: Camshaft Gear Teeth May Break (R/2017/194)Car-Recalls.co.uk (reproduce DVSA) · Other source · published 10 July 2017 · consulted 2 November 2026
  7. Fiat JTD engineWikipedia · Other source · consulted 8 October 2026
  8. Alfa Romeo Brera (guía del taller)The Alfa Workshop · Other source · consulted 8 October 2026
  9. Alfa Romeo 159Wikipedia (alemán) · Other source · consulted 8 October 2026 · in German
  10. SCHAEFFLER - ALFA ROMEO 159 (939_) 2.4 JTDM (939AXD)Rolling Kft. (catálogo) · Technical documentation · consulted 8 October 2026
  11. Isuzu D-MaxWikipedia (inglés) · Other source · consulted 2 November 2026
  12. Isuzu D-MAX 2. Generation (2012-2017): Modelle, Technische DatenADAC Autokatalog · Technical documentation · consulted 2 November 2026 · in German
  13. Isuzu D-MAX 2. Generation, 1. Facelift (2017-2020): Modelle, Technische DatenADAC Autokatalog · Technical documentation · consulted 2 November 2026 · in German
  14. ¿Qué precio tiene cambiar una válvula EGR?RACE (Real Automóvil Club de España) · Other source · published 17 June 2024 · consulted 8 October 2026 · in Spanish
  15. Fiabilité Alfa-romeo 156: pannes par motorisation (2.4 JTD)Fiches-auto.fr · Owners' forum · consulted 8 October 2026 · in French
  16. Alfa Romeo 159 2.4 JTD 210 ch 93 000 km (2008, Ti): avis d'un propriétaireFiches-auto.fr · Owners' forum · published 26 January 2013 · consulted 8 October 2026 · in French
  17. Guía de compra del Alfa Romeo 159 de segunda manoDiariomotor · Motoring press · published 9 February 2024 · consulted 8 October 2026 · in Spanish
  18. Isuzu D-Max ProblemsCarsGuide · Motoring press · consulted 2 November 2026