Marcel, any luck on your electrical headache on your Volvo? This was the same problem mine started with. 'Neutral Secure not detected'. I had many places in the cab wire harness, the previous owner 'repaired'. We found the main culprit in the patched wiring, that caused that code, was in the harness behind drivers seat. Part of it went to the shifter, then under flooring, up into dash & through firewall. Was able to temporarily repair wires behind the seat & it cycled back to neutral & fired up. After waiting 3+ months for Volvo to supply the new harness, it's installed. A few more smaller headaches, air dryer, fuel tank straps, etc. & we might just make our trip to the National rally. Good Luck, Craig