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Nie, dziękuję Przekieruj mnie tamCódigo de erros ODB no citroen C5 II HDI
‐ The Citroën C5 II HDi stores OBD-II (E-OBD) Diagnostic Trouble Codes (DTCs) in the Engine ECU (Bosch EDC15C2 / EDC16C34 / EDC17CPxx depending on year) and in the Body/Chassis/Network controllers.
‐ Codes are five-character alphanumerics (e.g. P1351, U1003). The initial letter tells you which domain reported the fault (P = Power-train, C = Chassis, B = Body, U = Network).
‐ Typical, high-incidence HDi codes in a C5 II include
• Fuel & boost: P0087, P0088, P0299, P0234, P1210
• Diesel particulate & EGR: P2002, P1447, P1490, P0401, P0404
• Glow-plug/heating: P0380, P1351, P1352, P1353
• Sensor power & reference: P2670 (5 V rail), P0562 (system undervoltage)
• CAN / multiplex network: U1003, D000, D001
These codes are read with a compliant scan tool (generic OBD or PSA-specific “Lexia/DiagBox”).
Code taxonomy and why it matters
• First character: P / C / B / U → ECU group that detected the failure.
• Second digit: 0 = generic SAE, 1 = manufacturer-specific (PSA), 2 = SAE-reserved, 3 = ISO/SAE hybrid.
• Third digit (0-9) subdivides the system. Example for P-codes:
‑ 0,1 Fuel & Air metering
‑ 2 Injector circuits / boost control
‑ 3 Ignition & misfire
‑ 4 Aux-emission (EGR/DPF)
‑ 6 ECU internal & sensor 5 V references
Citroën C5 II HDi — common DTC clusters
a. High-pressure fuel system (Bosch CP3 / Delphi DFP3)
‑ P0087 (“Rail pressure too low”), P0088 (too high), P0093 (leak detected), P1210 (regulator open-circuit).
Root causes: blocked filter, in-tank lift pump, fuel pressure regulator (DRV), rail pressure sensor, injector leak-off.
b. Turbo & boost control (Garrett GT15 / KKK BV)
‑ P0234 (over-boost), P0299 (under-boost), P2562/P2563 (boost position sensor).
Check: VNT actuator, vacuum pipes, boost solenoid, MAP sensor, charge-air leaks, soot-seized vanes.
c. EGR & after-treatment
‑ P0401 (insufficient flow), P0490 (EGR position fault).
‑ DPF subsystem: P1445/1446 (additive, Eolys), P2002 (efficiency), P242F (filter overloaded), P2452/2453 (DPF pressure sensor).
Troubleshoot: differential-pressure sensor hoses, additive tank level, forced regeneration.
d. Glow-plug system
‑ P0380, P1351 “Pre/post-heating relay circuit”; P1352 “Plugs energised, relay not controlled”.
Frequent on HDi: one open glow plug causes ECU to flag but engine still starts above 5 °C. Measure each plug (<1 Ω) and relay output.
e. 5 V reference & sensor supply
‑ P2670 (5 V supply #2 too low) often accompanies shorted MAP/rail sensor wiring. Locate short, verify 5 V rail at ECU connector.
f. Multiplex / CAN (PSA VAN / CAN-B)
‑ U1003, D000, D001 imply lost messages between BSI (Body System Interface) and ECUs. Check battery voltage (BSI is voltage-sensitive), CAN wiring (118 Ω–122 Ω total), corroded foot-well connectors.
Reading and acting on codes
• Generic handheld readers show only P0xxx; use DiagBox/Lexia for full PSA-specific list, live parameters, actuator tests, forced DPF regen, ECU coding.
• Always capture:
‑ Stored & pending DTCs
‑ Freeze-frame data (RPM, rail pressure, vehicle speed, coolant temp)
‑ Live graphs (rail pressure vs. target, boost vs. MAP, DPF ΔP)
Diagnostic flow (best practice)
‐ PSA moved from Lexia-3 (PP2000) to DiagBox 9.xx; latest clones support DOIP/OBD over IP for post-2016 cars.
‐ Euro 6 HDi use BlueHDi SCR with AdBlue, introducing new codes (P20E8 Urea pressure low, P2BAD NOx efficiency). Though not on early C5 II, retrofit knowledge is relevant for workshops.
‐ Cloud-based telematics (Stellantis e-Diagnostics) is replacing DVD service boxes; expect OTA code reporting on new models.
‐ Example: Code P0087 logged with rail desired = 1500 bar, actual = 800 bar @ 3000 rpm → check in-tank pump flow (0.9 L/30 s), filter restriction, DRV metering sleeve movement (40–90 % duty).
‐ Analogy: CAN network = multi-drop RS-485; termination or corrosion can create reflections → U1003.
‐ Clearing codes without repairing root cause may mask emissions-related faults (illegal under EU Reg. 715/2007).
‐ DPF or EGR delete violates environmental law and periodic inspection (MOT/ITV/CTA).
‐ Always disconnect battery and wait 3 min before unplugging airbags/BOSCH ABS to avoid accidental deployment.
‐ Use genuine Eolys PowerFlex / Infineum F7995 additive; generic fluids change density and upset DPF dosing strategy.
‐ After fuel-filter replacement, prime with hand bulb to avoid P1471 “Fuel circuit priming”.
‐ If performing forced DPF regeneration, monitor exhaust temperature (target ≈650 °C) and keep fire extinguisher ready.
‐ Some PSA-specific codes (e.g. P1166, P11AA) differ between EDC16 and EDC17; always consult wiring diagrams for your exact ECU reference.
‐ Early 2.0 HDi 136 (2004-2008) suffer vacuum pump oil leaks contaminating brake booster – unrelated faults may appear as P1471 due to vacuum loss.
‐ PSA ServiceBox → free VIN decoding and wiring schematics for 1 h sessions.
‐ FrenchCarForum.co.uk detailed fault-code discussions (search by “Fault code log: Citroën C5 X7”).
‐ ISO-14229 (UDS) vs. ISO-15765 (CAN) differences – new HDi use UDS services 0x22, 0x31 you will face in advanced tooling.
Citroën C5 II HDi OBD codes follow the standard five-character OBD-II format but include many manufacturer-specific (P1xxx, U1xxx, Dxxx) entries. The most frequent codes involve high-pressure fuel supply, turbo boost, DPF/EGR, glow-plug circuits, 5 V sensor supplies and CAN communication. A structured diagnostic procedure—battery check, full-module scan with DiagBox, live-data correlation, root-cause repair, code clearing—yields reliable results and keeps the vehicle compliant with safety and emissions regulations.
