Range Rover L405 Engine Problems: Faults by Engine and Year

The most common Range Rover L405 engine problems depend on which engine your car has. The 3.0 TDV6 and SDV6 diesels are known for crankshaft and bearing failure, and the 4.4 SDV8 for timing chain wear and turbo issues. The 5.0 supercharged V8 suffers coolant leaks and supercharger rattle. The P400e plug-in hybrid was recalled for a water pump belt fault, and the later mild hybrids have their own electrical issues. Across the range, breather oil leaks, EGR carbon build-up and cooling system faults come up often. This guide sorts the problems by engine and year and explains which warning signs to act on.

L405 Engines at a Glance

The fourth-generation Range Rover (L405) was built from 2013 to 2021 (with sales starting in late 2012). It used more engine families than any Range Rover before it, so the first step with any fault is knowing exactly which engine your car has.

Engine Line-Up 2013–2021

Check the engine code on your V5C or on the block, or ask a specialist to confirm it from the VIN. Our Range Rover L405 engine page covers rebuild options for these engines.

Common L405 Engine Problems

Diesel Engines: TDV6, SDV6 and SDV8

3.0 TDV6/SDV6 crankshaft and bearing failure. This is the L405's best-known engine fault. Main and big-end bearings can wear, and in serious cases a bearing spins or the crankshaft breaks, which usually means a rebuild or a replacement engine. Specialists cite Land Rover's technical message SSM 72578 (2016), which acknowledged crankshaft and bearing failures on the 3.0 TDV6 and introduced a tighter manufacturing tolerance from engine number 011215-1001200. Long oil-change intervals and oil degradation are widely seen as contributing factors. Warning signs include a knock that rises with revs, a flickering oil pressure warning and metal particles in the oil.

3.0 V6 timing belt. The 3.0 V6 diesel uses a timing belt, which the RAC review describes as an expensive job, whereas the 4.4 SDV8 uses chains. Check the service history for proof the belt has been changed on schedule. A failed belt can cause major engine damage.

4.4 SDV8 timing chains and turbos. The SDV8 avoids the V6's crankshaft reputation, but specialists report timing chain and tensioner wear, especially on cars with long oil-change intervals, plus turbo problems linked to oil supply. A rattle on cold start is the classic early warning. Our timing chain service covers JLR V8 diesels.

Turbo actuators, hoses, breathers and EGR. Across both diesels, specialists report seized turbo actuators, split intercooler hoses and carbon from the EGR system. The RAC also notes breather oil leaks linked to the EGR valves and turbos. These faults usually cause power loss, limp mode and smoke. They are often mistaken for turbo failure, which is why our turbo replacement service identifies the cause before recommending any parts.

Petrol, Plug-In Hybrid and Mild-Hybrid Engines

5.0 V8 supercharged. The 5.0 V8 is generally robust, but plastic coolant crossover pipes and housings in the vee can crack and leak. Specialists warn that this is sometimes misread as a head gasket fault. JLR bulletin LTB00482NAS6 covers a supercharger "clattering, knock or rattle" caused by wear in the torsional isolator, on the Range Rover (LG) from the 2013 model year. Timing chain guide wear and carbon build-up on the inlet valves also occur.

3.0 V6 supercharged. This petrol V6 shares many of the 5.0 V8's design features, including coolant pipes in the vee. Specialists report cooling system leaks and supercharger-related noise. It is less common in UK L405s.

P400e plug-in hybrid. NHTSA recall 23V221 (Transport Canada recall 2023-189) covers 2018–2021 Range Rover and Range Rover Sport PHEVs. The water pump drive belt can detach, which can make the engine overheat and the coolant elbow rupture. Coolant can then reach the turbo heat shield and create a fire risk. Check that this recall work has been done.

Mild hybrids (2020–2021). NHTSA recall 26V248 covers a DC-DC converter fault on 2020–2024 JLR mild-hybrid models, which can cause a loss of drive power. On these cars, warnings that look like engine faults may come from the 48-volt electrical system, so diagnosis must come first.

UK owners should check open recalls by registration on the GOV.UK recall checker, because US and Canadian recall populations do not always match UK cars.

Warning Signs by Symptom

Most serious L405 engine failures give some warning first. Acting early is usually the difference between a repair and a rebuild.

L405 Symptom Guide

If the engine is already damaged, our engine rebuild service covers a full strip-down, measurement and rebuild where the block and major components are sound. A written diagnosis on our engine repair service confirms the actual fault first. For an itemised quote, use our get a quote page or call 01375 531355.

FAQs

Range Rover L405 Engine FAQs

Which L405 engine is the most reliable?
 No engine is fault-free, but specialists generally see the 4.4 SDV8 as tougher than the 3.0 V6 diesel, because it avoids the V6's crankshaft reputation and timing belt. Condition and service history matter more than the engine choice alone.

Which L405 years have the most engine problems?
 Specialists point most often to early 3.0 V6 diesels for crankshaft and bearing failures, and to early 5.0 V8s for timing chain wear. Later cars are not immune. A well-serviced early car can be a better buy than a neglected later one.

Does the L405 3.0 diesel have a timing belt or a chain?
 The 3.0 V6 diesel uses a timing belt, which needs replacing at the specified interval. The 4.4 SDV8 uses chains.

How can I tell if an L405 diesel has crankshaft problems?
 Listen for a knock that rises with revs, watch for a flickering oil pressure warning and look for metal particles at oil changes. A specialist can inspect the engine and the oil.

Do the P400e and mild-hybrid L405s have recalls?
 Yes. NHTSA recall 23V221 covers a PHEV water pump belt fault, and 26V248 covers a DC-DC converter fault on mild hybrids. Check your car's UK status on the GOV.UK recall checker.