Hill Decent Light on by itself
#1
12-18-2018, 08:05 AM
Hill Decent Light on by itself
Hi everyone. Quick question: Have a 2001 DII SE with 185k on the clock. I’ve noticed recently that the HDC light comes on from time to time, but then goes off. It doesn’t come on with the other two amigos most of the time, but I have had all three pop on intermittently over the years. They always seems to turn off the next time I start the car.
My wife and son want to take the Disco to Chicago for Christmas, from NC. Is there any danger to driving with an intermittent HDC light? Can it cause a fault in the ABS system? I know they are all connected. Also, I know not having a root cause makes this question hard to answer, but just looking for some general feedback from the experts on this forum.
Merry Christmas.
My wife and son want to take the Disco to Chicago for Christmas, from NC. Is there any danger to driving with an intermittent HDC light? Can it cause a fault in the ABS system? I know they are all connected. Also, I know not having a root cause makes this question hard to answer, but just looking for some general feedback from the experts on this forum.
Merry Christmas.
#2
12-18-2018, 10:37 AM
Recovery Vehicle
That's rare. Maybe the switch is faulty? Normally the ABS , HDC , TC lights come on at the same time due to them all sharing the same components.
I don't see any threat in driving with that light. Lots of people drive with the whole system not opperating correctly.
Just means you might not have Anti lock brakes or traction control.
Find a shop that can pull the codes for you
I don't see any threat in driving with that light. Lots of people drive with the whole system not opperating correctly.
Just means you might not have Anti lock brakes or traction control.
Find a shop that can pull the codes for you
#3
12-19-2018, 11:46 AM
I also thought it was strange it came on by itself. I drove the truck last night and the light was off again. That's why its been hard to get a reader on it, its very intermittent. I'll do some more research in the interim and report back if I ever do get a read from it. Oh, and I'll keep some extra distance on my trip to Chicago and back. 
#4
12-20-2018, 07:05 PM
#5
12-21-2018, 09:20 AM
Recovery Vehicle
#7
12-21-2018, 04:54 PM
HDC illuminates the brake lights through a separate switch from the pedal switch. It's an electronic switch in the SLABS computer. It will cause the HDC light to illuminate if it senses a loss of signal through the brake light system.
#8
05-08-2019, 10:07 AM
Bringing this back up. My hill decent light comes on randomly as well. Sometimes immediately upon startup but other times it appears to be after I brake hard. I was on the highway yesterday and had to slam on my brakes and the light came on. I have a code reader arriving in mail today. What should I be looking for to solve the issue?
#10
06-12-2019, 09:17 PM
