I was driving my 03' 6MT today (270,000 miles (80F warm day)) and all of a sudden my HVAC system shut down. HVAC digital dispay still on but I cannot adjust anything and the fan motor isn't working. SAT-NAV not working. Locks going intermittently. Then the engine would cut out a bit here and there and finally didn't want to go over 1,000rpm. I shut it down and waited about 10 minutes and it allowed the engine to rev again and i high tailed it home about 2 miles and then started acting up again. The car will still start however "Service Engine Soon" "Slip" lights are on. When the car is off and ignition is on the dash lights pulse and the HVAC system still is lit but inoperative.
BCM dead ringer?
Thanks,
Max

 

Step #1: Pull the OBD code.

 

Code is P0451 from the bcm
Code P2135 from bcm

 

P0451 is an EVAP problem which can cause engine malfunctions.

 

P2135 is the throttle position sensor which will definitely cause problems.

However it's odd they would both fail at the same time. I suspect you have a battery cable loose or dirty so clean that up, reset the code, see what comes back.