UK car repair questions? Ask a mechanic for answers ASAP
You may have a moisture issue with the PCM connector and inside the PCM. You can try to spray some penetration oil like PB buster, wd40 and disconnect the PCM connector. The codes 53 and 62 point to a PCM issue. Try to work the bolt back and forth without going too far and getting it stuck. If it does jam and or snap you can drill and tap the PCM and replace the bolt. You might be able to get a mechanic to help too. I know I would if someone asks me. let me know what you find. good luck
You might even get some help with people that repair PCM's. I have used a few off e-bay for internal module repairs where moisture issues cause faults. They repair the module or PCM for DIY people rather than replace, much cheaper.
I had my ABS module repaired for 50$ instead of replacing for 700 ford
you are welcome, good luck