Citroen C3 & C2 water damaged ECU

C2/C3 water damaged ECU

 

Common Citroen C2/C3 engine ECU malfunction caused by water ingress causing misfire and poor running....

 

A common complaint for the Citroen C3 & C2 vehicles is water damage to the engine ECU, this results in the engine cutting out, refusing to rev, misfiring or not starting.

 

Often there will be fault codes stored in the engine system that are blaming the throttle position, engine misfire or coolant temperature/O2 sensors. Despite these fault codes it is usually the engine ECU that has failed due to water contamination into the ECU multi-plug causing one or more of the terminals inside the ECU plug to corrode (if you disconnect the ECU plug then you will see the corrosion to the terminals).

Citroen C3 ECU     Water damaged Citroen C2 ECU

This is caused by fluid from the coolant system getting into the main engine wiring harness that travels along and into the ECU. Once the fluid has made its way to the ECU it then causes the corrosion to the pins and internal hardware which causes a high resistance or open circuit for various engine sensor/actuator circuits resulting in the running symptoms described before.

Water ingress C3 ECUEngine ECU water damage

 

Solution

We no longer offer service on this system type. Instead, these are still available from the main dealer to purchase, or you can purchase a used replacement and have the key coding swapped from your original using dealer-level diagnostic equipment.

 

Common Failure symptoms:

  • Cutting out
  • Poor rev range
  • Limp mode
  • Misfire
  • Engine management light

 

Common fault codes:

  • P0121 - Throttle Signals 1 And 2 Incoherence
  • P1161 – Throttle Position Implausible Signal
  • P0123 – Throttle Position Sensor
  • P2176 – Motorised Throttle Programming
  • P1340 – Multiple Misfire Detected
  • P0135 – O2 Heater Circuit
  • P0115 – Coolant Temp Sensor Fault
  • P1631 – ECU Internal Malfunction

 

Affected Vehicles:

  • Citroen Berlingo 2002 – 2011
  • Citroen C2 2003 – 2011
  • Citroen C3 2002 – 2011

 

Common failing part numbers:

21585598-3 A0 / 21585675-3 A0 / 21585768-5 A0 / 21585784-1 A0 / 21585785-4 A / 215859001 A0 / 21585932-9 A / 21585984-5 A / 21586048-9 A / 21586048-9A / 215862398B / 21586539-8A / 21586562-9 A / 21586563-2 A / 21586877-0 A

6011 150061 / 6053 215016 / 6100 269889 / 6192 553788 / 6192 553788 / 6275 618804 / 6287 628749 / 7052 754374 / 7288005632 / 7332 434979 / 8119 003131 / 8154 141 206 / 8184 161516

HW9651696680 / HW965583280 / HW9655883280 / HW9655883280 / SW9660374680 / SW9661191880 / SW9661700480 / SW9661960880 / SW9661961280 / SW9661978880 / SW9663306680 / SW9663394480 / SW9663717680 / SW9664127180 / SW9664242980 / SW9664637080 / SW9665424480 / SW9665666980 / SW9665799180 / SW9666257580 / SW9666262880

Citroen Products/Services

BERLINGO

C1

C2

C3

C3 PICASSO

C4

C4 CACTUS

C4 PICASSO

C5

C6

C8

C-CROSSER

DISPATCH

DS3

DS4

DS5

EVASION

GRAND PICASSO

JUMPER

JUMPY

NEMO

RELAY

SAXO

SYNERGIE

XANTIA

XSARA

XSARA PICASSO

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