DS5 ABS parking brake fault

[Zee]

Hi all. I'm new to this forum. Just brought DS5 hybrid 2012 last week. Fault come this morning abs parking brake fault. Hybrid won't work due to this. Has thrown many fault on snap on diagnostic
Fault code are:
C1325
U1213
P0487

[GiveMeABreak]

P0487 relates to the Air mixer: Position incorrect (Open too far), so not relevant to the EPB.
C1325 is your issue as it relates to the rear LH wheel speed sensor signal fault: Open circuit, short circuit to positive, short circuit to earth.

The signal from the wheel speed sensor is monitored by the ESP ECU every 20 milliseconds
Possibility 1: Short circuit to earth
Possibility 2: Open circuit
Possibility 3: Rear left wheel speed sensor not supplied

Whilst you have this fault, the following downgrade modes are in operation:

• Immediate cutting of all the speed control functions
• The electronic brakeforce distribution function is in down-grade mode
• Hill start assistance function inactive
• Switching of the electric parking brake to manual mode

So I'd focus on C1325 first and then the U1213 as below:

Fault Code:	U1213
Description of Fault:	Fault - absence of communication with the stability control (ESP) ECU : Value received incorrect. The ESP ECU sends out data that is invalid or information that is too short.
Conditions for Fault to clear:	Reception of 3 consecutive items of valid information
Downgrade Modes whilst Fault is active:	Possibility 1 - Deactivation of automatic mode - Ignition on: The electrically controlled parking brake releases if the button is not held - Ignition off: The electrically controlled parking brake releases if you hold the button for less than 3 seconds Possibility 2 - Deactivation of the hill start assistance - Dynamic braking by the electric parking brake
Symptoms:	Illumination of LED/Error message Electrically-controlled parking brake does not apply correctly Electrically-controlled parking brake releases unexpectedly Electrically-controlled parking brake does not release correctly Electrically-controlled parking brake applies itself unexpectedly The hill start assist is not working
Suspect Areas:	Brake pedal switch Electronic stability control (ESP)

[Zee]

Thanks alot. Should I start off changing the abs sensor or the brake switch 1st?

[GiveMeABreak]

As you have a specific fault with the rear LH wheel sensor signal, I would suggest investigating and eliminating that issue first, then the supplies unit.

[Zee]

Hi all. Finally found the culprit. Rear left abs sensor was split. Was joint together by previous owner. Thanks for you help guys

[GiveMeABreak]

No worries, that should sort it and hopefully the other issues too.