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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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-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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UPDATE: The dealer cleared all faults and asked me to drive the truck for at least 1 hour. When I picked it up from dealer the DSC, abs and suspension faults were all illuminated. I went for a road trip and after about an hour stopped for gas. After I restarted it, ALL faults have cleared. I have a fully functional air suspension, terrain response and HDC. Its been almost 3 weeks now and no faults have returned.
 

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Discussion Starter #10
So it turns out that my ABS module was having an internal failure which was causing the HDC inactive and Air suspension inactive messages on my dashboard. I was able to find a company on eBay that was able to rebuild my module in a couple days. It’s been about two months and the problem hasn’t came back. If you’re having the same problem, have someone test your module if you have checked everything else!
 

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1970-1995 Range Rover Classic
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So it turns out that my ABS module was having an internal failure which was causing the HDC inactive and Air suspension inactive messages on my dashboard. I was able to find a company on eBay that was able to rebuild my module in a couple days. It’s been about two months and the problem hasn’t came back. If you’re having the same problem, have someone test your module if you have checked everything else!
Would you mind sharing who did you go with to rebuild the module? I am having the exact problem...when driving for more than 40 miles, the HDC/air suspension error would turn on and goes away after shutting down for an hour. Battery and alternator seem to be working properly.
 

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Discussion Starter #12

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Discussion Starter #13

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1970-1995 Range Rover Classic
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Just a friendly reminder to make sure your air compressor itself, air compressor relay, and wheel speed sensors are checked and verified good before you decide it’s the ABS module. However, the ABS module failure is a common issue.
Great call! After paying a bit more attention to the error codes, it seems like my front wheel speed sensor maybe wearing out. I am going to replace it first and see if the issue fixes itself.
 

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FYI - it turns out my abs speed sensor was the cause! Since replacing both front sensors, no more fault. Yippie!!! and thanks @Lunarover1 for the heads up!
 
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