Experience of C0161 11 and 12 - Cadillac XLR Forum: XLR and XLR-V Forums
 
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post #1 of 5 (permalink) Old 06-05-2012, 03:37 PM Thread Starter
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Experience of C0161 11 and 12

Has anyone experience of DTC C0161 sub-codes 11 and 12?

I am getting both occasionally. This causes the traction control to switch off for the rest of the journey (ignition cycle).

I see the Vette guys have reported it, I was wondering if anyone here has had it happen to them and if a BPPS recalibrate fixed it?

The diagnostics include:

C0161 11
Possible causes of this DTC are the following conditions:

The BPP sensor circuit is shorted to voltage.

The BPP sensor needs recalibration.

A brake pedal that is binding
C0161 12
Possible causes of this DTC are the following conditions:

A signal circuit of the BPP sensor is open.

The BPP sensor needs recalibration.

All brake lamps are open.

All brake lamp grounds are open.

An internal BPP sensor malfunction


The brake pedal is not binding, the brakes are not binding, the brake lights are working correctly. This started after I was obliged to brake very heavily to avoid a motorist pulling out in front of me, possibly the hardest I have ever braked my XLR. Odd how these incidents happen at relatively low speeds, I was going under 40.

Last edited by xlrlist01; 06-05-2012 at 03:41 PM.
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post #2 of 5 (permalink) Old 06-20-2012, 01:46 PM
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No experience with your codes. But you could have possibly warped a rotor? Now it's detecting the vibration? Good luck let us know.
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post #3 of 5 (permalink) Old 06-30-2012, 09:23 AM Thread Starter
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Quote:
Originally Posted by Punisher View Post
No experience with your codes. But you could have possibly warped a rotor? Now it's detecting the vibration? Good luck let us know.
Thanks for the suggestion. There is no vibration and the rotors are not warped. The brakes are working perfectly.

I'm suspecting a failed BPPS as there is an additional code setting now, a P0573, which is a brake pedal circuit voltage short or open. Putting it all together suggests the Brake Pedal Position Sensor is on the way out. It looks easy to replace.

Calibrating the BPPS takes about 10 seconds with a Tech-2, about a minute including going through the Tech-2 start up sequence.
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post #4 of 5 (permalink) Old 06-30-2012, 03:00 PM
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I have had the traction control and stabilitrack light coming on for 2 years. The car has been at the dealer for one week a month. They are sick of seeing me and I am sick of the problem. They have changed 6 computers and have gone over the wiring. Now the ignition switch is acting up with the problem. Sometimes the button is dead and sometimes the car starts when I am not punching the button.
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post #5 of 5 (permalink) Old 07-01-2012, 11:18 AM Thread Starter
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Quote:
Originally Posted by Alarmu12 View Post
I have had the traction control and stabilitrack light coming on for 2 years. The car has been at the dealer for one week a month. They are sick of seeing me and I am sick of the problem. They have changed 6 computers and have gone over the wiring. Now the ignition switch is acting up with the problem. Sometimes the button is dead and sometimes the car starts when I am not punching the button.
Humm

Can I suggest you start a new thread on this and list all the codes recorded. Are you dealing with an XLR tech? I am hard pressed to see a reason why six computers would be changed for the same fault. Suggests to me they haven't a clue what is wrong and are not good at difficult fault finding.

Widespread problems (mystery ones if you like) are often down to a ground fault, somebody needs to look through all the symptoms to find a common cause. By any chance has your XLR been in a flood? That would be reason for extensive replacement.

Have you fitted the correct Delco battery in known perfect condition? XLRs detest batteries in poor condition. Modern, latest technology batteries (and the XLR uses one such) are very intolerant of being discharged for any length of time. The battery is physically small and packs a big punch, however it is very vulnerable to problems where a slightly lower tech battery would not have problems.

Last edited by xlrlist01; 07-01-2012 at 11:25 AM.
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