Peugeot 2.0 HDi and BlueHDi (DCM3.5/DCM6.2): Tuning the 308, 508 and 3008
The 2.0 HDi powers almost every larger Peugeot. Which engine versions exist, which ECUs they use and what software can realistically deliver.
October 25, 2026 by Leo Efimow
If you drive a diesel Peugeot 308, 508 or 3008, there is a good chance a 2.0 HDi sits under the bonnet. The four-cylinder has been the backbone of PSA's diesel range since the late nineties and has been revised so many times that "2.0 HDi" now describes a family rather than a single engine. For tuning, that is exactly what matters: between an early 90 hp eight-valve unit and a current BlueHDi with an SCR catalyst lie two decades of injection technology and several ECU generations from Bosch, Siemens and Delphi.
The engine versions at a glance
PSA calls the engines DW10 internally; the letter that follows shows the development stage. Our catalog lists these versions for Peugeot, among others:
| Engine | Output (catalog) | Typical models | ECU |
|---|---|---|---|
| DW10TD (RHY) | 90 hp | 206, 306, 307, 406 | Bosch EDC15C2 |
| DW10ATED (RHS/RHZ) | 110 hp | 307, 406, 607, 807 | Bosch EDC15C2 / Siemens SID801 |
| DW10BTED4 (RHR) | 136–140 hp | 307, 308, 407, 508, 607 | Siemens SID803 / Delphi DCM3.4 |
| DW10CTED4 (RHE/RHH) | 150–165 hp | 3008, 5008, 508, RCZ | Delphi DCM3.5 |
| DW10F (BlueHDi) | depends on version | 308 II, 508, 3008 II, 5008 II | Delphi DCM6.2A / DCM6.2C |
The early eight-valve engines (DW10TD, DW10ATED) are robust first-generation common-rail diesels. The DW10BTED4 brought 16 valves, a particulate filter and much finer injection; the DW10CTED4 added the Euro 5 calibration. The DW10F is the BlueHDi version with SCR and AdBlue, technically a different engine from its predecessors, even though the displacement stayed the same.
ECUs: why DCM3.5 and DCM6.2 are not the same
For the software, the ECU matters more than the engine code. Most Euro 5 2.0 HDi engines (in the first-generation 3008 and 5008, the 508 with 163/165 hp and the RCZ) run a Delphi DCM3.5. Depending on the model, the DW10BTED4 versions use a Siemens SID803/803A or a Delphi DCM3.4. The very early engines still rely on the Bosch EDC15C2.
The BlueHDi brought the Delphi DCM6.2 (listed in our catalog as DCM6.2A and DCM6.2C). It is a far more modern generation with more processing power, more complex exhaust aftertreatment logic and, above all, stronger write protection. Depending on the software version, the DCM6.2 cannot simply be written through the OBD port; the ECU then has to be removed and handled on the bench in bench or boot mode. Whether that applies to your car depends on the exact ECU identification. There is no blanket answer.
What the software changes on the 2.0 HDi
A serious Stage 1 calibration on the HDi touches the same maps as on any modern common-rail diesel: the torque limiter, injection quantity, rail pressure, boost targets and the smoke limiter, which defines how much fuel may be injected for a given air mass. The key is that these values fit together. More fuel without matching boost produces soot and high exhaust temperatures; more boost without adjusting the turbo control produces overshoot.
As typical Stage 1 guide values, our data lists the following per ECU:
- Delphi DCM3.4/DCM3.5 (DW10BTED4, DW10CTED4): around 20–30% more power and torque
- Siemens SID803/803A (DW10BTED4 in the 307, 607, 807): also around 20–30%
- Delphi DCM6.2 (BlueHDi DW10F): around 15–25% more power and torque
The smaller margin on the BlueHDi is no accident. Euro 6 engines are calibrated more tightly to their emission limits, and the software has to work in harmony with the SCR catalyst, the particulate filter and their control logic. These are guide values, not guarantees. The actual gain depends on the engine's condition, the software version and the gearbox.
Gearbox, clutch and particulate filter
On the 2.0 HDi, two groups of components deserve a look before tuning. The first is the drivetrain: many 508s and 3008s use an Aisin torque-converter automatic, the manual cars a dual-mass flywheel. A DMF that already rattles will not improve with more torque. On the automatic, a clean calibration ensures the extra torque builds up smoothly instead of hitting the clutches as a load spike.
The second group is exhaust aftertreatment. A particulate filter close to clogging or a coked EGR valve will answer any power increase with more frequent regenerations and limp mode. A clear word while we are here: disabling or removing the DPF, EGR or AdBlue system is emissions tampering and illegal on public roads. A software optimisation works with these systems, not against them.
Further options
For the Delphi and Siemens families used in the 2.0 HDi, our data documents further software functions alongside the power increase:
- Stage 1+ as a finer step of the power calibration
- ECO tuning with more torque in the low and mid range and unchanged peak power, interesting for high-mileage 508 SW or 5008 drivers
- Sharp Throttle for a more direct pedal response
- Vmax removal: mind the tyre speed rating and the registration requirements
- DTC Off strictly for non-emissions-related fault codes, for example after an approved modification
Stage 2 with additional hardware (intercooler, exhaust from the turbo with catalyst/DPF and certification) is possible on the DCM3.5 and DCM6.2 engines; on the SID803 versions it only makes limited sense.
Process and price
Peugeot is one of the brands we do not flash remotely but work on directly at the ECU. You have two options: bring the car to Stödtlen for an appointment of your choice, or remove the ECU and send it to us. The price is the same either way, and you can book both online.
A few examples from our pricing rules: the Peugeot 508 2.0 HDi with 165 hp and the 3008 2.0 HDi with 150 hp with a Delphi DCM3.5 start from €200 for Stage 1. The 308 II 2.0 BlueHDi with DCM6.2 starts from €300; on the 3008 II a surcharge applies for model year 2015 onwards. The configurator shows the exact price for your version.
On the legal side: the software change voids your vehicle's type approval. The software is intended for motorsport use only. See the motorsport notice for details.
Common questions from the workshop
How do I know whether my 2.0 HDi has a DCM3.5 or a DCM6.2? The quickest clue is the emission standard: a BlueHDi with an AdBlue tank is practically always a DW10F with a DCM6.2. On the Euro 5 engines with 150 to 165 hp, the DCM3.5 is the rule. Only the label on the ECU or a diagnostic read-out gives certainty, though. A photo of the ECU label is usually enough for us to identify the version in advance.
Will I notice the difference with an automatic too? Yes, often even more clearly than with a manual. With more torque, the torque-converter automatic upshifts earlier and keeps the engine in its efficient range. What matters is that the software builds torque smoothly and respects the gearbox limits. Then shift quality stays comfortable.
Do I need to change anything about servicing afterwards? The manufacturer's intervals still apply; with a lot of towing or high sustained load, slightly shorter oil-change intervals do no harm. More important is that the particulate filter can regenerate regularly: if you mostly drive short trips, plan a longer motorway run now and then. And with any serious job, the original state of the ECU is backed up before writing.
Conclusion
The 2.0 HDi is not one engine but a family with five development stages and at least four ECU types. The Euro 5 engines with a Delphi DCM3.5 offer the most headroom at a typical 20–30%, the BlueHDi with DCM6.2 somewhat less and often more involved access. Check the DMF, particulate filter and EGR before tuning and leave the aftertreatment intact, and you get a noticeably stronger diesel without losing its character. For more on the ECUs, read our article on Delphi DCM3 to DCM6 and the glossary entry for HDi.