What does the code mean? Truck has a steering problem, seems to be it won't stay on center almost like it is hunting for a wire though it doesn't have guidance on it. Truck s/n 2LL03946. Also, have tried several codes but can not get into truck to run learn. Any ideas on codes to try? The truck is built by Raymond and we have a lot of Raymond experience, but we do not have a manual for this truck and our Ray books do not show a code 18. Thank you for any help.