Going up a hill, traction and break lights comes on (service traction-break fluid) message on my screen, got to top of hill and slowed down, lights came off. 2008 pontiac g6

Check your brake fluid master cylinder or resevour. It could have a leak and is sucking in air. You will need to fix this and bleed your breaks to resolve.

Probly a computr issue...dont guess on parts. Unplug it and clean pins..then plug back in..see if car reboots. If no git it scand but find anothr mech. Go to surecritic.com

First of all, make sure that your brake fluid level is correct. The brake, traction, and ABS systems on these cars all work together and if one thing goes wrong in any one part of the system, all of those lights will come on at the same time. Check your brake fluid level and be sure to use the correct DOT 3 brake fluid. DO NOT SUBSTITUTE with any other fluid. Let me know if your brake fluid level is ok and we'll go from there.

Have it checked for DTC'S - diagnostic trouble code's.

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your traction control mechanism uses the abs breaks to slow the spinning and give you better traction. i'm thinking your traction control sensor has gone bad

Can't be reset if your ABS system or some component is faulty. check speed sensor on the wheel bearing, is there any rubbing or dull grinding noise coming from the front wheels? could be the entire bearing and speed sensor assembly has gone bad. this would cause all these faults to appear as that sensor triggers all these events in order to slow your vehicle while it downshifts itself and applies breaking to control the vehicle as a part of the stabilization system. The alternative is that the ABS system is not functioning properly and the trac control and hill decent systems are being deactivated as part of the fault. If the system cant apply breaking then the systems are rendered unavailable. the vehicle will stop but not using ABS just regular breaks. Check all ABS break fuses for damage.

check the brake fluid and make sure caliber is full of fluid. mine said that and it was because fluid was low.

Just a thought ....... check for uneven tire pressure , or different tire sizes.