Ds5 hdi major braking fault

This is the Forum for all your DS Automobiles Technical Questions, Problems or Advice.

Moderator: RichardW

al19812008
Posts: 5
Joined: 12 Jul 2022, 17:58

Ds5 hdi major braking fault

Post by al19812008 »

Hi guys,

My ds5 is having major faults due to the braking system. Having already read some of the topics from here I still have had no joy.
So I have all braking system lights on dash. This car is a push button start stop which is not working unless u hold in for 10 secs to start it up and stop it hand brake won't stay on and car is in limp mode so stuck in 3rd gear. Snow light flashing etc major gear box fault comes up as well as the major brake fault. On reader it states a/c pressure fault also vdc fault and a intercom fault. The codes are U1113
U0122
U1218
This is on a obd reader. Car has been also read on a garage computer and that said abs sensor fault but wouldn't tell them which one all sensors brakes checked all are fine. Brake switch has been replaced today that didn't work new battery fitted that didn't work I've tried all options including disconnect the battery to reset ecu that hasn't worked same codes can't Clear these codes till fault has been resolved. One option I've not tired is maybe it's a sticky electric hand break mechanism motor which I'm gonna look at tomorrow . Any help on this I would greatly receive. Thanks in advance
al19812008
Posts: 5
Joined: 12 Jul 2022, 17:58

Re: Ds5 hdi major braking fault

Post by al19812008 »

Hi guys just to add, this has now been taken to a garage but not main dealer. And they had 75 fault codes coming up. So they think its ecu they can't erase codes it's gonna have to be main dealer I think.
User avatar
GiveMeABreak
Forum Admin Team
Posts: 37780
Joined: 15 Sep 2015, 19:38
x 5820

Re: Ds5 hdi major braking fault

Post by GiveMeABreak »

They won't be able to erase fault codes if they can't connect to the ECU! Those codes all relate to communications faults on the data network. As you can see the Engine ECU is returned as the culprit in all these cases. This can also happen if the Engine ECU software has been attempted to be written to and failed as a result of a software update / tune or modification etc. At least you have something to go on to investigate further.
Fault Code: U0122
Description of Fault: Intersystem CAN network : Loss of communication with the ECU ABS/ESP. Communication fault between ECUs detected for 3 secs. Conditions of activation of the diagnostics: At least one of the following conditions must be fulfilled:
- Engine running
- Ignition on
Conditions for Fault to clear: Driving with the engine hot for 5 minutes
Downgrade Modes whilst Fault is active:
  • Deactivation of taking account of the ESP torque settings
  • Irreversible deactivation of the vehicle speed limiter (Need to switch the ignition off and then on, in order to make the function available again)
  • Deactivation of the tight spot for the cruise control
  • Reversible deactivation of the vehicle speed curbing
  • Reversible deactivation of the vehicle speed limiter
  • Reversible deactivation of the vehicle cruise control
  • Reversible deactivation of the vehicle speed limiter, cruise control and speed curbing functions when there is an engine information fault
  • Reversible deactivation of the vehicle speed limiter, cruise control and speed curbing functions when there is a transmission information fault
  • Reversible deactivation of the vehicle speed limiter, cruise control and speed curbing functions when there is a vehicle information fault
Symptoms:
  • Engine hesitating, cutting out
  • Lack of power
  • Starting problem
Suspect Areas: Engine ECU

Fault Code: U1218
Description of Fault: Intersystem CAN network : One of the parameters present in a frame emitted by the BSI is invalid. Communication fault between ECUs detected for 3 secs. Conditions of activation of the diagnostics: At least one of the following conditions must be fulfilled:
- Ignition on
- Engine running
Conditions for Fault to clear: Driving with the engine hot for 5 minutes
Downgrade Modes whilst Fault is active:
  • Reversible deactivation of the vehicle cruise control
  • Reversible deactivation of the vehicle speed limiter
  • Deactivation of the air conditioning
  • Inhibiting of the exhaust heat recovery function
Symptoms:
  • Engine hesitating, cutting out
  • Lack of power
  • Starting problem
Suspect Areas: Engine ECU

Fault Code: U1113
Description of Fault: Intersystem CAN network : No communication with the ABS or ESP ECU. Communication fault between ECUs detected for 3 secs. Conditions of activation of the diagnostics: At least one of the following conditions must be fulfilled:
- Ignition on
- Engine running
Conditions for Fault to clear: Driving with the engine hot for 5 minutes
Downgrade Modes whilst Fault is active:
  • Deactivation of the limitation of the Easy Move torque
  • Reversible deactivation of the speed limiter and cruise control functions
  • Replacement gear if there is a vehicle speed fault
  • Air conditioning deactivation
  • Deactivation of the request for regeneration of the particle filter from the diagnostic tool
  • Deactivation of the injector resetting strategy
  • Function for limitation of the static torque for the protection of the gearbox
  • Irreversible deactivation of the vehicle speed curbing function (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)
  • Irreversible deactivation of the vehicle cruise control (Need to switch the ignition off and then on, in order to make the function available again)
  • Request for opening the piloted flaps (Controlled air inlet module)
Symptoms:
  • Engine hesitating, cutting out
  • Lack of power
  • Starting problem
Suspect Areas: Engine ECU
Please Don't PM Me For Technical Help

Marc
al19812008
Posts: 5
Joined: 12 Jul 2022, 17:58

Re: Ds5 hdi major braking fault

Post by al19812008 »

Hi thanks for your response,

I have spoken to an ecu specialist regarding codes and issues they are not 100% sure it's an ecu problem they belive I have a bad wore somewhere on my car. I think it could be brake sensors. But no idea where to start. Possibly wore harness corroded in have a mechanic looking at this tomorrow to see if we can find out qhere the problem is. The car did have a yellow abs light come on and was on for about a month It's my wifes car and we didn't know why it came on but because we left it to late to fix its now in limp and stuck in first gear due to being an automatic. Car won't start unless you hold down the push button and handbrake won't hold due to being electrical. But it's intermittent.
User avatar
GiveMeABreak
Forum Admin Team
Posts: 37780
Joined: 15 Sep 2015, 19:38
x 5820

Re: Ds5 hdi major braking fault

Post by GiveMeABreak »

These faults won't be caused by an ABS sensor. If it was one of the sensors, a diagnostic would show you which sensor it was having a problem with.

So I would be looking to the engine ECU wiring connectors and making sure these are not corroded or loose / damaged. I'd also be checking around that area especially the engine fuse box and ensuring there's no burning or water damage too.
Please Don't PM Me For Technical Help

Marc
al19812008
Posts: 5
Joined: 12 Jul 2022, 17:58

Re: Ds5 hdi major braking fault

Post by al19812008 »

Hi guys, so I have now found out the cause of my problems it's been tested at main dealers today, and they found that the abs control unit is faulty and needs to be replaced with a cost of 2k so my only other cheaper option is to have this unit refurbished any body had this done? What was the outcome. New control unit is on back order and wouldn't be able to have it programmed by any other garage we have been told. Is this true or can a new one be fitted and reprogrammed by another person??
User avatar
GiveMeABreak
Forum Admin Team
Posts: 37780
Joined: 15 Sep 2015, 19:38
x 5820

Re: Ds5 hdi major braking fault

Post by GiveMeABreak »

The ABS / ESP ECU will need to be programmed by somebody who has access to a dealer level diagnostic tool like Diagbox. It should be able to be configured according to your vehicle without too much issue as yours is a 2013, so Diagbox V7.58 should be able to do it, but no guarantees as the quality of the clone VCIs varies considerably.
Please Don't PM Me For Technical Help

Marc
al19812008
Posts: 5
Joined: 12 Jul 2022, 17:58

Re: Ds5 hdi major braking fault

Post by al19812008 »

Hi thanks Marc, we're buying the new unit and I'm currently waiting for my local garage to tell me of it'd some thing they can do if they can't then it will be main dealer.