Errors related misfire and also tire pressure monitors - Ground?

MikesGM · Sep 24, 2025

My 08 Saab 5.3 has been a little nuts lately. I left the driveway, cold, the other day and while driving it surged a little and then the check engine light started blinking. It eventually went solid and it won't clear, but is running smoother now. I know a "small amount" about the 02 sensors and open and closed loops but wondering based on these pics from my scanner, if we are thinking sensor or ground, or both.

I say this because it seems to run flawless almost always, but sometimes I also get errors on the DIC referencing the TPS. When I look at all 4 tires they read 0 psi. Other times, they all read their correct pressures. Not sure if they happen to grounded in the same part of the frame as any of the 02 stuff.

Thanks

wags69 · Sep 24, 2025

I'll get the TPMS out of the way.
Everything related to TPMS is located in the tailgate of the vehicle.
With all 4 not measuring, I would suspect the Liftgate Module, but can't rule out the TPMS sensors
Take it somewhere like Discount Tire, or your local tire shop, and see if they can reprogram the TPMS sensors for you.

MikesGM · Sep 25, 2025

Hi Wags, Thank you for the reply. Interesting you say that about the tailgate because when i lift the tailgate, on this and my envoy i get the initial click. Lately the 9-7x has been pulsing every 5 seconds or so with a very light sounding click until i close it. When i close it, i don't always get the bigger click that i would normally get. so maybe something with that is also related to the TPMS. I will investigate. Thanks!

sw904 · 2025-09-29T15:59:21-0400

Just fixed this recently on my 2006 Trailblazer LS. Broken ground in the flex harness where it goes into the hatch.
Here's the discussion: https://www.trailvoy.com/threads/liftgate-has-its-own-beat.218879/?post_id=1676893#post-1676893

Errors related misfire and also tire pressure monitors - Ground?

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