KenK

Is it possible for the ignition switch to start acting up(going bad) and not throw an OBD code? Trying to sort out a starter problem on a newly acquired 2006 hhr. From recall websites, it appears the ignition recall was completed. After straightening out a wiring problem (previous post on that), now the starter wants to stick on for a few seconds after the engine is started. It's only happened once, hence I can not test to see if it's the solenoid/Bendix sticking or if the ignition switch did not cut power to the crank circuit.

I don't get any codes when scanned. The starter looks brand spanking new, which yes, may mean nothing. And the switch is comparably easy and cheap to replace, may start there. Thoughts?

KenK

Come to think of it, my money's on the switch. When it happened, I immediately turned the key off, and the starter continued to crank the engine. Then I immediately pulled the key out the ignition, then it stopped. Hmmm 🤔

Oldblue

Sounds like you’ve figured it out. Perhaps the switch was messed up by the previous wiring error.
how do you know the ignition recall was performed? Which key do you have?

KenK

I ran the vin# on the NHTSA website. Said "0 unrepaired recalls"

I have 2 keys, one with a fob, and a spare

Oldblue

Are the holes in the keys small round holes or oblong holes?

firemangeorge

The parts in the ignition recall kit. Note the small holes on the replacement keys.

KenK

Ahh, thanks, got it. They are the small round hole keys

donbrew

The key only sends a "start" signal to the BCM, In the Owner Manual it says to momentarily turn the key to start then let go of it, The starter stops when the engine starts. This is not a 1957 Chevy, almost everything is controlled by computers and "switches" are really "sensors". If the starter continues to run after start some signal is corrupted (or, you are holding the key and sending a second signal).
Look at my sig for an Owner Manual.

Oldblue

Then recall was done, now possibly the ignition switch has worn out?

donbrew

The key sends a signal to the BCM telling it to energize the starter relay, when the engine starts the ignition module tells the BCM to de-energize the starter relay (or it times out after a few seconds).

THE SWITCH DOES NOT CONTROL HOW LONG THE STARTER RUNS. If you hold the key until after the engine starts you are sending a second "start" signal.

In other words: the key switch is not to blame for the starter running after a start event. Either operator error or the ignition module has a problem.

Is that more clear.