Golf Hybrid Won't Start After Recent Shop Work

Had a similar situation with a Golf GTE from 2020. When the car won't start and shows error codes, it often points to the power supply system rather than just the ignition switch. The main relay switch in these hybrids can fail, preventing proper communication between the conventional and electric systems. Found this out when my hybrid completely stopped responding. The voltage drop test revealed the high-voltage circuit break between the hybrid battery management system and the starter components. The connections had worked loose over time, creating intermittent contact issues. The fix required specialized diagnostic equipment to properly test the hybrid power management system. Not a DIY job due to the high voltage components. The problem ended up being corroded terminals at the main power distribution point, likely from moisture getting into the connection. For newer hybrids showing these symptoms, best to have it checked at a shop certified to work on hybrid systems. The interaction between conventional and electric systems makes diagnostic work more complex than on traditional vehicles. This was definitely a serious issue that required immediate attention to prevent potential damage to other electrical components. Before taking it in, document when the problem occurs and any error codes shown. This helps narrow down whether its a primary circuit issue or secondary system failure.

Thanks for the detailed info about the power system problems. Your situation sounds really similar to mine. I am curious, do you remember roughly how much the repair ended up costing? And has everything worked properly since getting it fixed? My wiring harness looks intact from what I can see, but I am worried about potential hidden damage to the hybrid components if I keep trying to start it.

After the mechanic checked my Golf GTE, it turned out the Terminal 15 ignition positive was interrupted due to a faulty connection. The starter solenoid wasnt getting the proper signal because of this issue. Total repair cost was 95€ to fix the cable connection, which was much less than I initially feared. Since the repair three months ago, the car has started flawlessly every time. The circuit break was caught early enough that no damage occurred to any other hybrid components. The battery terminal connections were also cleaned and tightened as a preventive measure during the service. Your symptoms match what I experienced exactly. Getting it checked by a qualified technician is the right move, especially with a hybrid system. Better to address these electrical gremlins early before they cause more extensive problems with the power management system.

Just got back from the certified hybrid shop and wanted to share my experience. The fuse box had moisture damage that was causing intermittent connection problems with the main relay switch. The repair was relatively straightforward and cost 120€, including a full diagnostic scan. The mechanic explained that water had seeped in through a poorly sealed connector from the previous repair work. They cleaned all the battery terminals, replaced the affected fuse box components, and properly sealed everything. Car starts perfectly now. Really glad I didnt keep trying to start it and risk damaging the hybrid system. Thanks for pushing me to get it checked by specialists, definitely saved me from potentially bigger problems down the road.