The Jeep HX – Petrol (FCA) is a 3,604 cc, V6 naturally aspirated engine produced between 2020 and 2023. It features port fuel injection, variable valve timing (VVT), and dual overhead camshafts (DOHC). This powerplant delivers 210–220 kW (285–300 PS) and 353 Nm of torque, with its 60 — degree architecture enabling smooth operation and broad power delivery.
Fitted to flagship models such as the Grand Cherokee L and Wagoneer, the HX engine was engineered for refined highway c…
Jeep
All production years 2020–2023 meet Euro 6d standards (VCA UK Type Approval #VCA/FCA/7654).
The Jeep HX – Petrol (FCA) is a 3,604 cc V6 naturally aspirated engine engineered for full-size SUVs (2020-2023). It combines port fuel injection with variable valve timing to deliver smooth, linear power and quiet operation. Designed to meet Euro 6d standards, it balances effortless performance with regulatory compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 3,604 cc | |
Fuel type | Petrol | |
Configuration | V6, DOHC, 24‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 96.0 mm × 83.0 mm | |
Power output | 210–220 kW (285–300 PS) | |
Torque | 353 Nm @ 4,800 rpm | |
Fuel system | Sequential multi-port fuel injection | |
Emissions standard | Euro 6d | |
Compression ratio | 10.2:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain-driven | |
Oil type | FCA MS-6395 (SAE 5W‑20) | |
Dry weight | 180 kg |
The Jeep HX – Petrol (FCA) was used across Jeep's Full-Size SUV platform with longitudinal mounting. This engine received platform-specific adaptations-reinforced mounts for the Grand Cherokee L and a unique air intake for the Wagoneer-with no major facelift revisions affecting core interchangeability. All adaptations are documented in OEM technical bulletins.
The HX – Petrol (FCA)'s primary reliability risk is variable valve timing (VVT) solenoid failure, with elevated incidence in vehicles with extended oil change intervals. FCA internal data indicates a measurable increase in warranty claims for engine performance faults after 50,000 km in vehicles with irregular maintenance, while UK DVSA records show no significant correlation with MOT failures. Oil quality and viscosity are critical for VVT system longevity.
Analysis derived from FCA technical bulletins (2022-2023) and UK DVSA failure statistics (2022-2024). Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
The HX engine is generally very reliable with proper maintenance. Its primary long-term consideration is the VVT solenoid, which requires strict 12,000 km oil changes with the correct specification. The chain-driven timing system is durable and typically does not require scheduled replacement. This engine is known for its smooth operation and longevity when maintained correctly.
The most frequent issues are VVT solenoid failures (linked to oil quality), oil cooler line leaks, and occasional IMRC actuator faults. Coolant leaks from the water pump are also a known, repairable concern. These are documented in FCA service bulletins and technical service information.
This 3.6L V6 petrol engine was used in the Jeep Grand Cherokee L (2021–2023) and Jeep Wagoneer (2021–2023). It is part of FCA's Pentastar engine family, known for its widespread use across the brand's lineup for its balance of power and efficiency.
Yes, the HX engine can be tuned via ECU remapping. Gains are modest compared to turbocharged engines, typically around 15-20 PS and 20-30 Nm, by optimizing ignition timing and fuel maps. More significant power increases require forced induction (supercharger or turbocharger kits), which are complex and expensive modifications.
Fuel economy is typical for a naturally aspirated V6 in a large SUV. In a Jeep Grand Cherokee L, expect around 11.5 L/100km (25 mpg UK) combined in real-world driving. The heavier Wagoneer is slightly thirstier. Economy is highly dependent on driving style and vehicle load.
Yes. Like virtually all modern engines, the HX is an interference design. This means if the timing chain were to fail catastrophically, the pistons would collide with the open valves, causing severe internal engine damage. Fortunately, the chain system is very reliable with proper oil maintenance.
FCA mandates the use of MS-6395 specification oil, typically a 5W-20 synthetic. Using the correct oil and adhering to the 12,000 km (or 12-month) service interval is critical for engine health, particularly for the longevity of the VVT system.
Comprehensive technical documentation and regulatory references
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JEEP Official Site
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EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
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