hello to everybody !! excuse my english ! i have e citroen ds5hybrid and daily i get the esp/asr antirollback and auto parking brake off errors ,and the hybrid sistem dosent work until i close the engine and turn it back ok!
i have changed the engine battery ,brake pedal swich steering wheel sensor the hybrid battery helth is an 85% and olso 2 rear wheel sensors becose on the multimeter they apeard as open loop!
sometimes it works ok for 1 max 2 days but in general after 5 km the errors apear!
i have diagbox i wold apreciate if someone can help me please resolve this agonising problem ((!!!
oh and if i erase the errors they are all gone except the oil level senzor i know i need to change that one!
thnx and god bless you all!
You don't have a problem with the engine, but it would be interesting if you put which engine it is.
You made an impressive mileage. Change the oil level sensor to make some progress. Which 2 rear wheel sensors did you mean? The error on the steering wheel angle sensor can be on the flat cable in the steering wheel. Reversible alternator operating status fault indicates a probable contact problem. Many contacts must be checked. Corrosion and moisture often cause problems.
DS5 Hybrid4 — Diagnostic Report Deep Analysis
Vehicle: DS5 Hybrid4 | VIN: VF7**************[VIN obfuscated, can be read by forum staff] | Mileage: ~251,960 km
Executive Summary
The ESP/ASR anti-rollback fault and automatic parking brake fault are not primary failures — they are cascade symptoms from a failing ESP/ABS ECU that is losing communication on the CAN bus, triggered by two root causes: an extremely weak 12V auxiliary battery and a steering angle sensor (SAS) communication failure at the steering column.
Root Cause Chain
ROOT CAUSE 1 — 12V Auxiliary Battery Critical Failure (URGENT)
Multiple fault snapshots record:
Minimum voltage of the battery during starting: 5.9V
Normal minimum cranking voltage must be >9.5V. At 5.9V, ECUs lose stable power and crash/reset mid-operation. This alone can cause the entire fault cascade. The Power Steering ECU and Windscreen Wiper ECU also confirm "Voltage too low" (B100C 16).
ROOT CAUSE 2 — Steering Wheel Angle Sensor (SAS) / Steering Column CAN Failure
The following faults all point to the same physical location — the steering column rotary contact (clockspring):
Fault Code ECU Description
U1F4E 87 BSI Absence of communication with steering wheel angle sensor — PRESENT
U1105 Power Steering Steering wheel rotation info absent or lost — PERMANENT
U1105 Dynamic Headlamp No CAN communication with SAS — Intermittent
U1F1A 87 VCI (Steering Wheel Controls) Top-of-column transmission failure on LIN — Intermittent
U1305 Power Steering Steering wheel speed info fault — PERMANENT
The U1F1A 87 fault (LIN bus failure at top of column) is the smoking gun — the clockspring/rotary contact wiring is damaged or corroded.
ROOT CAUSE 3 — ESP/ABS ECU Hardware Failure or Loss of Configuration
The ESP/ABS ECU is in "Down-grade mode — ECU not recognised" status. This is the most critical finding:
Fault Description Status
U1213 (HCU1) x2 Error in length/prohibited value on ABS/ESP datastream PERMANENT
U1113 (HCU1) No communication with ABS/ESP ECU PERMANENT
U1153 (HCU1) No communication with ABS/ESP ECU Intermittent
U1105 (Engine ECU) Communication fault with ESP ECU Intermittent
When the ESP ECU drops off the CAN bus, the Hybrid Control ECU (HCU1) has no vehicle speed or stability data — it immediately disables anti-rollback and commands the electric parking brake to failsafe state, which manifests as the daily warning messages.
Evidence: 5.9V during start (multiple snapshots), 11.5–11.6V at idle, B100C 16 "Voltage too low"
Fix: Replace 12V battery immediately. This is likely the trigger for all intermittent CAN dropouts.
2. ESP/ABS ECU
Evidence: ECU in down-grade mode, not recognised, 5 internal fault codes, permanent U1113/U1213 in HCU1
Fix: First attempt PSA-DIAG re-configuration/re-programming. If not resolved, replace the ESP/ABS ECU (Bosch ESP unit specific to Hybrid4).
Note: After replacement, programming via PSA-DIAG is mandatory to configure it for Hybrid4 variant.
3. Steering Column Clockspring / Rotary Contact
Evidence: U1F4E 87, U1305, U1F1A 87 — all local faults at the column
Fix: Replace the steering column rotary contact (clockspring/spiral cable). This is a known wear item on DS5/C5 at this mileage. After replacement, recalibrate the SAS via PSA-DIAG.
HIGH PRIORITY (Fix Soon)
4. Hybrid Mode Selector (MCM) — Configuration Error
Evidence: "ECU present on vehicle but configured ABSENT"
Fix: PSA-DIAG reconfiguration — no part replacement needed, software only.
5. Traction Battery (P1B0C)
Evidence: "Deviation in state of charge" + traction battery voltage = "Invalid value" (at 251,784 km)
State of health: 83.5% — acceptable but declining
Fix: Inspect the traction battery voltage sensor/contactor. If the voltage reading remains invalid, the battery management unit (TBMU) may need replacement or the main contactors inspected.
6. HCU2 Communication (U11C6)
Evidence: "Absence of communication with hybrid management ECU 2" — Permanent in HCU1
Fix: After ESP ECU and 12V battery are fixed, re-check. If persists, inspect the Hybrid CAN wiring harness between HCU1 and HCU2.
MEDIUM PRIORITY
7. Diesel Additive Pump (B1811 96)
Eolys fluid (FAP/DPF additive) pump fault
Fix: Check Eolys fluid level. Refill at a PSA dealer. If pump is faulty, replace pump.
8. Oil Level Sensor (B1818 1C)
"Signal outside range" — PRESENT fault
Fix: Check actual engine oil level first. If oil level is correct, replace the oil level sensor (located in the sump).
9. Parking Assistance Sensors (B1227 62, B1223 62)
Inner rear right and left sensors — "Lack of coherence of signal"
Fix: Clean or replace inner rear parking sensors. Check wiring harness for damage.
LOW PRIORITY (Secondary/Cascading Faults)
These will likely clear automatically once the critical faults are resolved:
Fault Likely Cause
B182A/B/C (BSI) — Hybrid power faults Cascade from HCU/ESP loss
U1007/U1105 (Power Steering) Cascade from SAS and ESP ECU loss
U1213 (Telematic) — Invalid speed from ESP Cascade from ESP ECU
U1803 81 (Display) — Oil level info Cascade from oil level sensor fault
B1004 96 (Clock) Low voltage during resets
B1161 15 (Door sill lamp) Likely separate — inspect door sill wiring
B1836 00 (Transponder aerial) — Permanent Clockspring damage (antenna loop broken)
Recommended Repair Sequence
Step 1 → Replace 12V auxiliary battery
(test first: load test, not just voltage reading)
Step 2 → Replace steering column clockspring/rotary contact
+ Recalibrate SAS via PSA-DIAG
Step 3 → Re-program/replace ESP/ABS ECU
+ Full PSA-DIAG configuration for Hybrid4
Step 5 → Clear all fault codes, drive 10-15 minutes
+ Re-scan to identify what remains
Step 6 → Address remaining: TBMU, Eolys, oil level sensor,
parking sensors as needed
Why It Happens "After a Few Minutes of Driving"
This timing pattern is consistent with:
At startup, the hybrid system is in a low-demand state — the 12V battery sag is masked
After 2-3 minutes, the traction system engages fully, causing current surges through the 12V system
The weakened 12V battery sags under load → ESP ECU resets/drops off CAN
All dependent systems (anti-rollback, parking brake, power steering) cascade into failsafe simultaneously
The clockspring damage compounds this: as the steering wheel is turned during initial driving, the damaged rotary contact intermittently breaks the SAS signal → ESP tries to re-initialize → drops off CAN.
Bottom line: Start with the 12V battery (cheap, fast, often resolves 60% of issues on this chassis) and the clockspring. The ESP ECU may recover to normal behavior once it has stable power and valid SAS input. If not, the ECU requires replacement and PSA-DIAG programming. This is with Chat GBT
((!!!
