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Discussion Starter #1
I get 'HDC INACTIVE' error on the dash along with Air suspension inactive, and the yellow brake and abs lights at random times while I drive. Usually after I turn the vehicle off for a couple hours it will reset it self. Sometimes it will come back or sometimes it will take a couple days for it to reoccur. I replaced the battery and it didn’t help. I even took it to a LR shop but they couldn’t replicate the problem and they found a bad wheel speed sensor so they replaced, thinking that was the cause of it. Well a couple days picking it up from the shop and the same thing keeps happening. What else could be causing this?
 

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I get 'HDC INACTIVE' error on the dash along with Air suspension inactive, and the yellow brake and abs lights at random times while I drive. Usually after I turn the vehicle off for a couple hours it will reset it self. Sometimes it will come back or sometimes it will take a couple days for it to reoccur. I replaced the battery and it didn’t help. I even took it to a LR shop but they couldn’t replicate the problem and they found a bad wheel speed sensor so they replaced, thinking that was the cause of it. Well a couple days picking it up from the shop and the same thing keeps happening. What else could be causing this?
I have the exact same issue. It has become less frequent but still pops up from time to time. Battery tested ok so I didnt change it. Steering angle sensor was ok too. Still stumped on this one.
 

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Discussion Starter #3
I’m starting to suspect it’s the alternator. I keep seeing on other threads that the alternator should put out 14+ volts. If it puts out less then you could run into issues like these. I tested mine and it was putting out 13.3 volts. I just need to see if anyone can confirm the voltage needed from the alternator.
 

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2006-2009 Range Rover MkIII / L322
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And your car is a?

Hdc is common on weak battery but inactive suspension never saw on a range rover cause of weak battery or alternator
Voltage from alternator is variable on my 2006. Sometimes 13 sometimes 14
On cold mornings range rover ecu ups rpms to 1100 to charge battery like -30C cold. At this rpms i am seeing 14.6v
Will check in 1 hours again

Look at the nav screen on first start. If screen is go to restart and you watch black screen for 2-3 seconds its mean you have weak battery or voltage systems
 

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2006-2009 Range Rover MkIII / L322
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531 Posts
-25C
Obd reads 10.2v
After running engine for 5min reading is 14.6-14.2

15min 14.2v driving 60km/h
 
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