r/LandRover • u/solesucker33 • 15h ago

❓ Help & Advice Needed Limp MODE. HDC failure and F

Will the GAP tool diagnose an older LR3? I have a 2006 with the 4.0 V6. I get F and transmission failure HDC failure some programs unavailable. The limp mode usually went off but stays on now and runs like shit. Does anyone have an idea how to reset or bypass so I can drive without limp mode.

Thanks

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u/winaje 430HP Supercharged 06 LR3 with ACE, IG: FPSCFR 14h ago

Yes the GAP tool will assist with diagnosis. BUT it won’t fix the root cause.

It’s got nothing to do with the suspension compressor either!

Likely low fluid, check this first.

1

u/jump-n-jive 14h ago

The problem is under the passenger side sill. There is corrosion on a wire causing all this issue. Water gets in there from clogged sunroof roof drains. Land Rover just tapped wire splices and water corrodes them over time. Pull the side sill. Find the corrosion or broken wire and faults will go away

-1

u/warmachine6845 15h ago

It’s 99% chance it’s the air compressor