ECU Errors on DS5

[pasko]

Please, help. These errors occurred after replacing the alternator/generator. Before that, they updated all the modules to the latest version in the authorized service. Citroen ds5 hybrid 4.

[GiveMeABreak]

Ok, so I'm going to exclude the A/C BSI issues for now as the reset of the Hybrid faults are all pointing toward the Hybrid Battery. I won't put any more up as you can see from most of the faults it's all pointing to the same thing.

The traction battery unit is probably end of life and these are not cheap to replace (about £6,500 UK for the unit alone excluding labour). The ECU is part of the battery, so all these faults would indicate the Hybrid Traction Battery itself, though I would get that checked with Citroen directly.

I know that the DS-badged DS5 only provide an 8 year warranty on the drive batteries, so yours being 11 years old is probably at its operational life expectancy. So it's a fair bit of money to invest in the car, so unless the rest of the vehicle is in top notch condition, you have some decisions to make.

Even most of the latest Hybrid / EVs only warrant 8-10 years on the battery or 100k-150k miles, so another hidden cost down the line that is going to put people off buying second hand.

Fault Code:	U1288
Description of Fault:	CAN hybrid network: Communication impossible. Communication fault between ECUs detected for 0,01 secs. The following conditions have to be met: - Ignition on - Indicator lamp READY lit. Warning Lamps with this Fault: "SERVICE" warning lamp Warning lamp STOP No lighting of the READY warning lamp
Conditions for Fault to clear:	-
Downgrade Modes whilst Fault is active:	-
Symptoms:	Lack of power Jerking/stalling (Stopping the vehicle) Absence of the electric mode Difficulties changing gear Absence of automatic stopping of the internal combustion engine Cutting of the vehicle speed limiter Cutting of cruise control
Suspect Areas:	Hybrid control ECU Engine ECU CAN hybrid network

Fault Code:	P1B0C
Description of Fault:	Traction battery : Deviation in the state of charge of the traction battery. Detection of a deviation in the internal temperature of the traction battery or of a deviation greater than 40% between the traction battery blocks for 60 s. Conditions of activation of the diagnostics: ECU main triggering Auto-retention prior to ECU becoming dormant Warning Lamps with this Fault: "SERVICE" warning lamp Warning lamp STOP
Conditions for Fault to clear:	-
Downgrade Modes whilst Fault is active:	-
Symptoms:	Problem activating the power unit Lack of power Absence of automatic stopping of the internal combustion engine Absence of the electric mode Cutting of the vehicle speed limiter Cutting of cruise control
Suspect Areas:	ECU and traction battery assembly

Fault Code:	P1B1B
Description of Fault:	Hybrid control ECU 1: Internal fault. The fault appears after 2,5 seconds. The following conditions have to be met: - Ignition on - Indicator lamp READY lit
Conditions for Fault to clear:	Ignition on
Downgrade Modes whilst Fault is active:	Reversible alternator in neutral
Symptoms:	Lack of power Absence of the electric mode Jerking/stalling (Stopping the vehicle) Absence of automatic stopping of the internal combustion engine
Suspect Areas:	Hybrid control ECU

Fault Code:	P1664
Description of Fault:	Hybrid control ECU 2: Engine torque Information fault (Security level 2). Internal fault. Conditions of activation of the diagnostics - The following conditions have to be met: - Ignition on - Indicator lamp READY lit
Conditions for Fault to clear:	-
Downgrade Modes whilst Fault is active:	Reversible alternator in neutral
Symptoms:	Lack of power Absence of automatic stopping of the internal combustion engine Absence of the electric mode Whistling / Hissing / Wind noise
Suspect Areas:	Hybrid control ECU

Fault Code:	U12C6
Description of Fault:	Hybrid CAN Control network : Length error or prohibited value of the frame from the hybrid management ECU 2. Communication fault between ECUs detected for 0,5 secs. The following conditions have to be met: - Ignition on - Indicator lamp READY lit
Conditions for Fault to clear:	Ignition on
Downgrade Modes whilst Fault is active:	Irreversible deactivation of the vehicle cruise control (Need to switch the ignition off and then on, in order to make the function available again) Irreversible deactivation of the vehicle speed limiter (Need to switch the ignition off and then on, in order to make the function available again) Driving possible only in combustion mode Loss of the ZEV (Zero Emission Vehicle) electric mode Loss of the 4x4 function Loss of Sport mode Deactivation of the "Stop and Start" function
Symptoms:	Absence of the electric mode Lack of power Absence of automatic stopping of the internal combustion engine Cutting of the vehicle speed limiter Cutting of cruise control
Suspect Areas:	Hybrid control ECU

[pasko]

So you think that The traction battery unit replecement is only solution?

[GiveMeABreak]

Obviously I can only provide you with the official fault code descriptors, so armed with this, you'll have to either get somebody with experience on these to diagnose it further, but as I said the Hybrid ECU and the battery module itself are all integrated, so short of having the connections checked by a specialist I would think that that is the most likely prognosis looking at the codes.

At 220k KMs (137k miles) it's certainly at about the life expectancy for the battery.