2.3 dCi (M9T) engine: faults and reliability

• 2.3 dCi 100-125 hp (M9T)

  since 2010 · 100–125 hp · M9T

  Buy

  One source considers them the most durable of the engine's versions, although it is a single opinion source.^[2]

• 2.3 dCi 130-145 hp (M9T)

  since 2010 · 130–145 hp · M9T

  Buy

  The sources highlight this range as balanced, always with up-to-date maintenance.^[2]

• 2.3 dCi 150-180 hp (M9T, some twin-turbo)

  since 2010 · 150–180 hp · M9T

  With caution

  The sources concentrate the injection and turbo warnings on these, although without figures.^[2]

• 2.3 dCi in the Navara D23 (NP300)

  since 2014

  With caution

  Check that the SCR software update was carried out.^[4]

Buy: No known serious faults, or they have already been corrected, in this version. With caution: Worth buying if something specific is verified: history, a replaced part or a completed campaign. Avoid: High risk of a serious fault that is hard to check for or prevent.

1. 1High severityOccasionalFrequency: OccasionalEmissions controlClogged or broken EGR valve damaging the turboThe 2.3 dCi's EGR valve clogs with soot in urban use and, if it breaks, its fragments can damage the turbo. A French source cites bills of €1,200 to €2,300 for the EGR and turbo together.Repair (garage): €1,200–€2,300
2. 2Medium severityOccasionalFrequency: OccasionalInjectionFaulty injectors on the 2.3 dCiSome 2.3 dCi engines show the "injection problem" warning and go into limp mode, sometimes at low mileage. One source indicates between €400 and €1,800 for the repair.Repair (garage): €400–€1,800
3. 3Medium severityOccasionalFrequency: OccasionalEmissions controlDiesel particulate filter (DPF) clogged in urban useIn urban deliveries with little mileage the particulate filter may fail to regenerate and become clogged. One source puts the servicing or replacement at between €350 and €1,500.Repair (garage): €350–€1,500
4. 4High severityRareFrequency: RareFuelFuel pipe rubbing against the wiring harness (recall 0EC1)In July 2024 Renault recalled 35,039 Master 2.3 dCi vans built from 23-09-2014 to 27-09-2023 because of possible rubbing of the fuel pipe, which could leak. The fix is a spacer.
5. 5Low severityRareFrequency: RareEmissions controlSCR system and AdBlue tank faultsOn Euro 6 engines with AdBlue there are documented SCR system faults. On the Navara D23 2.3 dCi EU6b (2016-2019) a software update campaign was carried out, covering 1,012 units in Poland.

Severity colours: low, medium, high, critical. How we rate them

Manufacturer

Renault

Family

M9T

Fuel

Diesel

Displacement

2,300 cm³

Cylinders

4

Fuel system

Turbo

Injection

Common rail

Timing

Chain

Power

100–180 hp

Production

since 2010

Makes

Renault, Opel and Nissan

Technical data^[1][2][3]

1. since 2010

   2.3 dCi 100-125 hp (M9T)

   Lower-power versions, with 285-310 Nm of torque and a cited durability of up to 520,000 km in light use.^[2]

2. since 2010

   2.3 dCi 130-145 hp (M9T)

   Mid-range; one case is documented as reliable up to 175,000 km.^[2]

3. since 2010

   2.3 dCi 150-180 hp (M9T, some twin-turbo)

   More powerful versions, with a twin turbocharger on the highest outputs.^[2][3]

4. since 2014

   2.3 dCi in the Navara D23 (NP300)

   A variant for the Navara D23, mentioned in the 2016-2019 SCR campaign.^[4][5]