LR-4 If I hit a bump the dash lights up like a xmas tree with errors. Thinking a loose connection to the PCM. Where is it ?

Check your ground connection on your battery and where it connects to your frame. Sounds like you have a loose connection.

Semper Fi,
Z

U knocked some connection loose. Gotta check out the wiring and connections. Also make sure that you did not pop out a fuse.

You must have a very loose electrical connection somewhere which is breaking contact every time you hit a decent bump. Have the main electrical cables to the battery checked carefully for condition, make sure the cable connections to the battery terminals are very clean and tight and check all power connections and wiring at the alternator. Then recheck if you are still getting an electrical power loss when you hit a bump.

If you are losing headlights and tail lights etc and getting the alternator warning you should be experiencing a loss of electrical power to the engine(coils, spark plugs and fuel injectors) and engine computer also.

Sounds like the connection behind the instrument cluster is loose, i had a customer with the same problem only on a 2012 camry and it turned out to be the connection on the cluster. I just adjusted the tension on the connection by bending the contact pins a little.

Might be a loose battery cable. Just a thought. did see other post where you stated that you've disconnected battery several times. Hope you find/found a solution.

if u hit a bump and it goes out check the connections and wiring at battery and alternator for loose,damaged or corrosion

It cold just be a fuse that is loose in the fuse box causing the dash lights to come on and off. Or potentially a loose wire from the fuse box the dash lights.

It is probably a loose ground wire. If it only does it while hitting bump, then there is a loose wire somewhere. It may be loose fuse but probably loose wire or solder joint going to dash control board

Check the body controller above the driver kick panel left side of the panel . This may have a connector problem . Possibly melted connector. Or there is a ground loose somewhere in that area.

Superfreak

Check to see if any of the wire connections are loose.

Neil