C5 recurring error "Speed Control System Faulty"
Moderator: RichardW
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C5 recurring error "Speed Control System Faulty"
My 2006 C5 2.2 HDI Bi-Turbo regularly comes up with the message "Speed Control System Faulty". Interestingly this occurs in the same places on my regular trips. It happens when I leave two particular roundabouts and accelerrate. The cruise control and speed limiters are both disabled and also the first turbo seems to stop working (a form of limp mode?). If I stop and turn off the ignition for 5 minutes everything returns to normal. I have replaced the brake switch with the modified version to no effect. Any ideas?
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Re: C5 recurring error "Speed Control System Faulty"
I now suspect the yaw sensor. Anyone know where this is located?
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- Sara Watson's Stalker
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Yaw sensors seem to often be low down, mid-wheelbase. I'd look on the floorpan under front seats or beneath the rear seat cushion.
Citroën changed the sensor type around RPO 10100 to an "inertia" device - think iPhone etc. This makes me presume its pedecessor worked on a gyroscopic mass arrangement.
As to Lexia and C5 faults - I have noted a decent number of faults in steering angle sensors with early C5s - can't be sure it carries through to C5-II and X7 versions. Along with the radio aerial fault, it is one of two you're almost guaranteed to detect on any car plugged in.
Citroën changed the sensor type around RPO 10100 to an "inertia" device - think iPhone etc. This makes me presume its pedecessor worked on a gyroscopic mass arrangement.
As to Lexia and C5 faults - I have noted a decent number of faults in steering angle sensors with early C5s - can't be sure it carries through to C5-II and X7 versions. Along with the radio aerial fault, it is one of two you're almost guaranteed to detect on any car plugged in.