The Citroën 5GC (engine code EP6DT) is a 1,598 cc, inline-four turbocharged diesel engine developed by PSA Group, produced between 2010 and 2018. It features high-pressure common-rail direct injection, variable geometry turbocharging (VGT), and dual overhead camshafts (DOHC), delivering 81 kW (110 PS) and 270 Nm of torque. This configuration provides responsive low-end pull ideal for urban and family driving applications.
Fitted to models such as the Citroën C4 Picasso, C3, and DS4, the EP6DT was engineered for fuel efficiency and smooth operation in compact and MPV segments. Emissions compliance was achieved through exhaust gas recirculation (EGR), diesel particulate filter (DPF), and selective catalytic reduction (SCR) with AdBlue injection, enabling Euro 5 and later Euro 6b compliance across its production run.
One documented reliability concern is EGR valve coking, highlighted in PSA Service Bulletin SIB-ENG-2013-05. This issue arises from carbon and oil deposit accumulation due to short-trip driving and delayed maintenance, leading to restricted airflow and regeneration faults. Later production units incorporated revised EGR cooler designs and updated ECU calibration to improve soot management.
Production years 2010–2015 meet Euro 5 standards; 2016–2018 models comply with Euro 6b depending on market (VCA UK Type Approval #VCA/EMS/5680).
The Citroën 5GC (EP6DT) is a 1,598 cc inline-four turbo-diesel engine engineered for compact and family vehicles (2010–2018). It combines common-rail injection with a variable geometry turbocharger to deliver strong low-RPM torque and improved fuel economy. Designed to meet Euro 5 and Euro 6b standards, it balances efficiency with regulated emissions compliance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,598 cc | |
| Fuel type | Diesel | |
| Configuration | Inline-4, DOHC, 16-valve | |
| Aspiration | Turbocharged (variable geometry turbo) | |
| Bore × stroke | 77.0 mm × 85.8 mm | |
| Power output | 81 kW (110 PS) @ 4,000 rpm | |
| Torque | 270 Nm @ 1,750–2,500 rpm | |
| Fuel system | Bosch CRS 2-16 common-rail (up to 1,600 bar) | |
| Emissions standard | Euro 5 (2010–2015); Euro 6b (2016–2018) | |
| Compression ratio | 15.5:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Honeywell variable geometry turbo (VGT) with electronic actuator | |
| Timing system | Timing belt (interference design) | |
| Oil type | PSA B71 2310 (SAE 5W-30) | |
| Dry weight | 133 kg |
The VGT turbo provides strong low-RPM torque ideal for stop-start driving but requires strict adherence to 15,000 km oil change intervals to prevent turbo bearing and fuel pump wear. PSA B71 2310 (5W-30) oil is critical due to its soot-handling and thermal stability properties. Extended short-trip cycles increase DPF regeneration frequency and EGR coking. The Bosch CRS 2-16 HPFP demands ultra-low-sulfur diesel (EN 590) to prevent injector and pump wear. Timing belt replacement every 5 years or 120,000 km is essential due to interference design. SCR system requires periodic AdBlue refills and NOx sensor calibration.
Oil Specs: Requires PSA B71 2310 specification (PSA SIB-ENG-2014-03). Compatible with ACEA C3 but not a substitute.
Emissions: Euro 5 certification applies to 2010–2015 models (VCA Type Approval #VCA/EMS/5680). Euro 6b compliance confirmed for 2016–2018 units in UK markets.
Power Ratings: Measured under ECE R85 standards. 81 kW output optimized for urban efficiency (PSA TIS Doc. P22004).
PSA Technical Information System (TIS): Docs P21876, P21902, SIB-ENG-2013-05
VCA Type Approval Database (VCA/EMS/5680)
ISO 1585:1996 Road vehicles — Test code for net power of internal combustion engines
The Citroën 5GC (EP6DT) was used across Citroën's PF2/PF3 platforms with transverse mounting and shared with DS Automobiles for premium applications. This engine received platform-specific calibrations—higher EGR flow in the C3 and SCR integration in the DS4—and from 2016 the facelifted C4 Picasso adopted the Euro 6b-compliant EP6DT variant with revised NOx sensors, creating interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped horizontally on the front-facing side of the cylinder block, near the transmission bellhousing (PSA TIS P21891). The 8th VIN digit indicates engine family ('K' for EP6 series). Pre-2014 models have silver valve covers with black turbo inlet; post-2014 units use black valve covers. Critical differentiation from EP6CDT: EP6DT has a diesel-specific high-pressure fuel pump and SCR dosing unit. Service parts require build date verification—timing belts before 06/2014 are incompatible with later SCR-equipped variants due to revised tensioner routing (PSA SIB-ENG-2014-03).
The EP6DT's primary reliability risk is EGR valve coking, with elevated incidence in vehicles used for short urban journeys. Internal PSA field reports from 2014 indicated a significant number of pre-2015 units required EGR cleaning or replacement before 90,000 km, while UK DVSA data links a notable share of emissions-related MOT failures to DPF saturation in high-mileage examples. Short-trip cycles and poor fuel quality increase particulate and thermal stress, making maintenance interval adherence and fuel specification critical.
Analysis derived from PSA technical bulletins (2012–2017) and UK DVSA failure statistics (2016–2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about CITROEN 5GC-EP6DT.
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