But when negative cable is removed and replaced, Rover starts right up.

2004 Range Rover, 110,000 mi

 

Just wanted to update developments...

This is brand new to us though I have owned Land Rovers previously. When we were looking at the car at the dealer, it needed to be re-keyed and reset, then it work fine. Drove it home 2 hrs and we ended with an oil level fault, air suspension fault, and the clock ran backwards! The next morning, the key turned, but it would not start. Did a hard reset (removed battery cables and touched them together) and everything work fine. Later after it sat, same thing...no start. Just removed and replaced negative battery cable and work fine...except for the door looks. They stopped working then 10 minutes later they're fine.

Did a battery load test and it checked out.

So last night, drove it and key it sit LOCKED (again, power door locks were intermittent) for an hour in the cold, started right up. Came home, pulled it into the garage, LOCKED it again, this morning, started right up.

So I have a very limited data set, but it appears something is happening when it sits too long unlocked...any ideas?

Sooo, development again. After it started right up this morning sitting locked all night, I locked it again. Went out two hours later and only would start after I R and R the negative terminal again. Ugh...

 

Sounds like a steering column fault. Look up "diagnose steering column Range Rover " on YouTube.

 

Try undoing both battery terminals and touch + and - together for one minute and then put back on battery. This is supposed to reset main computer to factory presets. Can't hurt to try with all the BS you are going thru.

 

Turns out it was the steering column ECU...even though key was turning they were not getting a signal back...$1200 installed for a pull off unit...