why is it that the power locks will not unlock unless the engine is off
Has it always done this or did it just start recently? If it has been that way for 10 years, it probably is the design of the car. If not, I would start looking for some type of interlock switch (sometimes located on the door frame latch plate). Is it all doors or just the rear?
Search Pontiac Montana Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Pontiac Montana Experts