05 Q45 SLIP VDC/OFF ABS

[hbass17]

SLIP VDC/OFF ABS lights are all on. Brake fluid and sensor is working fine. How can I troubleshoot this problem. It seems that a bunch of sensors are all tied to this condition. How can I check these sensors.

[Q451990]

I'd start by pulling any stored OBDII codes. On my wife's 05 G, fluid only half way down in the master cylinder will trigger this trio of lights, to be sure your brake fluid is not just in range, but topped off. Her G also showed these lights when one of the camshaft position sensors failed. Most parts places will pull codes for you at no charge. I have a bluetooth scan tool that cost less than $5 on ebay and works nicely with a free smartphone app.

[hbass17]

It had the SLIP VDC/OFF ABS for awhile with no codes, then P1140 came up with the CEL. I replaced the camshaft position sensor and got rid of the P1140 code and the CEL, but the SLIP VDC/OFF ABS lights are still on.

[zenjoe]

I had my lights all come on when my brake light switch failed (02 q45). This one is a little easier to spot as I found that my brake lights were on all the time and would not shut off. Everything was ok until my dash lit up, then when I parked it I could not get the transmission into park....could not get key out of ignition...lasted the day at work with the doors unlocked and keys in ignition! I replaced the brake light switch (the idiotically hard one to reach above brake pedal) and everything went back to normal.

[EdBwoy]

OP, any updates since then? I somehow missed this topic when you posted

Zenjoe, pretty odd behavior from your brake switch. The light staying on shows a fail-closed condition, while the car refusing to go into park is a fail-open circuit. So on one hand the switch is saying ,"I've been engaged, go ahead and turn on the lights," at the same time it's saying, "sorry can't move the gear selector till I've been engaged"
Check out what this guy with the M45 was going through: topic607397.html

Btw, I believe if you pushed the shift lock through the small access hole you should be able to move the selector - in case it happens to someone else.