jump start & limp home?
 

Can a jump start cause problems with the ETM and cause limp home mode?

disconnect battery hold terminals together for 5 mins then reconnect that will clear fault and if u have a charged battery and it clears and doesnt come back then it should be fine could be battery was so flat that sensors didnt have sufficient power to em causing ecu to think theres a fault which once you clear by holding the wires together if it doesnt come bk then you should be ok