Computers and BSI Peugeot, Citroën, DS and Opel
Vehicle dropping into limp mode, immobilizer light on, or a battery that's flat every morning? On a PSA platform, half the faults that look like engine faults actually start in the BSI — its body control module — and almost none of them require buying a new unit. We diagnose on the bench, repair at component level and re-pair computer, BSI and key: EDC17, SID807, SID310, DCM and MD1, with mileage and immobilizer data intact.
No-obligation diagnosis- Bench diagnosis
- 24–48 h
- Repair and return
- 3–5 business days
- BSI and key pairing
- Included
- Lab warranty
- 2 years
Here's how we diagnose it
✔ connection established> scanning: computers and bsi peugeot, citroën, ds and opel...⚠ fault pattern recognized> component-level repair probability: highOn a PSA platform the engine computer isn't in charge on its own. The BSI — the body control module living behind the dash — is the node everything runs through: it powers modules, distributes the network, stores the vehicle's configuration and validates the immobilizer code before the engine is allowed to start. That's why a fault that begins in the BSI disguises itself as an engine fault, and why replacing the computer without looking at the BSI fixes the symptom for a week before everything comes back.
What we do is separate the two before anyone spends money. The unit comes out of the vehicle, goes on the bench and is connected to simulators that reproduce crankshaft, injectors, air flow and the dialogue line with the BSI itself. That's where you see what actually failed: a shorted injector driver stage, a burnt voltage regulator, a corrupted memory area, or a BSI with traces eaten by moisture. These are few-dollar components inside units the dealer only knows how to replace whole.
Pick the symptom to see the likely cause
Pick the symptom to see the likely cause
Limp mode on the 1.6 HDi and BlueHDi
The vehicle caps around 3,000 rpm and won't respond to the pedal, typically from a shorted injector driver stage or an out-of-range air flow reading — and it comes back within a few miles of clearing the codes
Electrical symptoms that confirm it
- The shop's equipment won't communicate with the computer: no response on CAN, and the BSI answers as if the module were no longer in the vehicle
- Internal codes (P0601, P0605, P062F and neighbors) pointing at the unit's own memory or processor rather than at a sensor
- Immobilizer PIN rejected when trying to program a new key, even with factory equipment
- Unit bricked after an interrupted software update: the program no longer boots and the module won't answer diagnostics
- Unstable supply voltage, with the BSI or the computer resetting during cranking
Going to the dealer, instead of our lab
Dealer
with the vehicle down: ordering the virgin unit — rarely in local stock on these imported platforms — VIN coding, re-pairing with the BSI and the keys, plus labor.
IFC Lab
from intake to return: component-level repair or cloning with the original data, already paired. It arrives Plug & Play, no new keys, no mileage lost.
You don't pay to find out whether it can be fixed
No-obligation diagnosis
We tell you what the unit has and what it costs to fix before you authorize anything. If you decide not to proceed, there's no diagnostic invoice
No repair, no charge
If the unit doesn't come back to life on the bench, we don't bill the repair — we tell you straight that cloning is the path
Pairing included
The computer comes back paired with your BSI and with the keys you already have. We don't hand you a part and leave the rest to you
Two-year warranty
The work is covered for 24 months. This isn't a parts supplier's warranty, it's our own work backed by us
Whoever sells parts needs you to buy the part. We make a living solving faults, so we can give you the only answer that matters: this unit can be repaired, or it can't.
Our lab workflow, step by step
- Step 01
Intake and shipping coordination
You send us model, year, engine and symptoms, we validate the case and give you removal and packing instructions — we coordinate your shipment by courier to the lab
- Step 02
Simulation bench diagnosis
We connect the computer or the BSI to simulators that reproduce vehicle operation and isolate the fault down to a specific component, without risking the harness or tying up a bay
- Step 03
Component-level repair or cloning
We replace driver stages, regulators and capacitors and rebuild corroded traces on the original board; when the damage is irreversible we read by Bench or BSL, recalculate the checksum and transfer VIN, mileage and immobilizer PIN to a replacement unit
- Step 04
Pairing, testing and return
We re-pair computer, BSI and key, run temperature and load cycles, and ship it back with a technical report and installation instructions
Command of the PSA architecture
HDi, BlueHDi and PureTech engine computers
Bosch EDC17C10 and EDC17C60 on the 1.6 HDi and BlueHDi, Continental SID807, SID807EVO and SID310, Delphi DCM3.4 and DCM6.2, and the recent Bosch MEV17 and MD1CS003 units on the 1.2 PureTech. Valeo on the older generations. This is where nearly everything the driver knows as limp mode and check engine begins.
- Repair of injector driver stages and air flow measurement circuits
- Bench and BSL read/write on units that no longer answer over OBD, with checksum recalculation
- Recovery of units bricked by an interrupted software update
- Cloning to a replacement unit preserving VIN, mileage and immobilizer data
BSI, immobilizer and keys
The BSI is the vehicle's central node and the silent cause of faults that look scattered everywhere. We treat it as a module: open it, repair it and re-pair it, instead of replacing a unit that then demands a full reconfiguration at the dealer.
- Repair of water ingress and corrosion on internal traces and connectors
- Parasitic draw with the vehicle locked, when the BSI stops going to sleep
- Pairing of BSI, computer and key, and immobilizer PIN restoration
- Remotes and antennas that stopped being recognized, without replacing the key set
Commercial and fleet — Partner, Berlingo, Expert, Jumpy, Boxer and Jumper
These are imported and specialty fleet platforms, and when one of these vans goes down the local dealer rarely has the unit on the shelf. We prioritize fleets and shops that send us several modules, with B2B invoicing and turnaround committed in writing before we start.
- Engine computers and BSI across the group's commercial platforms
- Repair of internal connectors and harnesses damaged by vibration, moisture and heavy duty cycles
- Monthly invoicing cycle for partner shops, with a technical report per unit
What's included when you send us the unit
No-obligation diagnosis
The first step, and the one that costs you nothing if you decide not to proceed.
- Simulation bench analysis with a written report
- A clear split between a computer fault and a BSI fault
- Fixed quote before any intervention
- A straight answer when the unit isn't viably repairable
Full repair
Once you authorize, this is what the agreed price covers — no extras halfway through.
- Component-level repair or cloning with the original data
- VIN, mileage and immobilizer PIN preserved
- Computer, BSI and key paired before return
- Two-year warranty and support during installation
If your vehicle is down, or you've already been told it "has to go to the dealer", the next step is a message with the model, the year and the symptom. We answer with the technical path and the timeline, not with a blank quote.
Message us on WhatsAppImmobilizer light on, or a flat battery every morning? Tell us the symptoms and we'll coordinate the diagnosis.
Frequently asked questions
How do I know whether the problem is the computer or the BSI?
From the bench test, and only from there with certainty. Both modules produce similar symptoms — active immobilizer, lost communication, scattered faults — and that confusion is exactly what leads to replacing the wrong module. We test both away from the vehicle before saying anything.
Do I have to program new keys after the repair?
No. We preserve VIN, mileage and the immobilizer PIN, and return the unit already paired with your BSI. The keys you have keep working.
My vehicle had water on the carpet. Is that related to the electrical fault?
It is, far more often than people think. Water entering through a blocked windshield drain or a worn door seal ends up where the BSI lives, and the corrosion only shows weeks later. By the time the symptom appears nobody connects the two, but it's one of the most repeated patterns on these platforms.
What if the unit can't be repaired?
We tell you before we proceed and explain the alternative, which is usually cloning to a compatible replacement unit — far cheaper than a new dealer-coded unit, and without the wait to import the part.
Do you work with shops and fleets?
Yes, and it's a large part of what we do. Partner shops get turnaround committed in writing, a technical report per unit and a monthly invoicing cycle — and the vehicle never leaves the mechanic the customer trusts.
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