2007 9-3 Aero 6-sp 97K - new battery
Every once in awhile since I owned this car, it won't turn over at all, I reinsert fob, and it works after 2-3 attempts. My mechanic actually thought it was my battery, but saw some an error code related to my starter controls (?) and told me that if this happens again, try jiggling something behind the battery compartment (pictures attached). I replaced the battery 3 months ago.
Yesterday, after a short 5 minute drive to grocery store, the car wouldn't turn over at all. I had forgotten what the mechanic had said. All the lights and everything, and SID said Starting, but not a sound. 15 minutes later waiting for kid to pick me up, I tried again and it started right up.
Same thing today. I immediately opened hood and knocked on this unit, and the car immediately started. It says Electronic Control Unit, but when I google, I can only find an ECU that is on the engine block.
Can someone tell me what is in my pictures, and potentially why jiggling/bumping it may fix it, temporarily. The white zip tie is replacing a brittle unit with a zip tie that broke.