Tach not working, Service stabilitrack, rough idle!!!

Redoil · August 25, 2023

07 Silverado. No tach. Slow cranking. Trans goes max psi. Runs bad

Deengr · January 8

Same issue on 07 Silverado. (Hard 2nd gear shift with no tach rpm) Engine light come on. Found vid on it. On vid, it was a problem with key module. With it idling, he tapped on module and rpm came on, and problem with 2nd gear shifting went away. Hope this helps.

Lkramer · April 5

Exact same problem just started today on my 09 Silverado today. Took it home backed it in shut it off, then tried to start it and it took a long time to start and it continued to crank. Shut it off again and tried to start it, and it fired back up better than it's ever started and the tach works. No stabilitrak messages either! I'm going to continue to follow until somebody figures this out. It's my only vehicle!

07TahoeLS · June 27

Same issue with my 07 Tahoe, rough idle, slow acceleration, trouble cranking, stabilitrac light and hard shifting in 1st gear. It’s been running fine up until yesterday, first it wouldn’t start at all then I jumped the battery but no luck, came back 10 minutes later and it sputtered to come on. I’ve been able to start it a day later but still takes a while to turn over. Any solutions yet???

whatevenisthis · August 1

I have a 2009 chevy suburban ltz with z55 suspesion pack, engine vin 3, same issues as all of the other posts. Bad starts, lose tach, service stabilitrack, rough driving. WE NEED TO SOLVE THIS.

GMCustomerService · August 1

15 hours ago, whatevenisthis said:

I have a 2009 chevy suburban ltz with z55 suspesion pack, engine vin 3, same issues as all of the other posts. Bad starts, lose tach, service stabilitrack, rough driving. WE NEED TO SOLVE THIS.

We are sorry to see you are having concerns with your Suburban and would like to investigate this further on our end. Please send us an email to [email protected]. Be sure to include your Username and Forum name in the subject line with additional details. We look forward to your email.

09TahoeXFE · August 4

Hello All, I have a 2009 Tahoe XFE 5.3 LT with the same issues. P0301, P0420, P0430 before installing new AC DELCO plugs and wires with a cylinder 1 coil pack swap- did not follow swap, stayed P0301. Removed coil pack harness from metal bracket (possible grounding/sparking issue? and the P0301 code gone) now P0336 , p0420 andp0430 No Tach, Rough idle, Stabilitrak disabled. Next step is to try Crankshaft Position Sensor. This Engine has been burning oil since day 1, maybe clogged Cats... a/c still ice cold, drives like a caddy, near perfect condition and definitely NOT ready to retire the ol lady.....

Patrick Afams · October 1

On 8/3/2024 at 8:08 PM, 09TahoeXFE said:

Hello All, I have a 2009 Tahoe XFE 5.3 LT with the same issues. P0301, P0420, P0430 before installing new AC DELCO plugs and wires with a cylinder 1 coil pack swap- did not follow swap, stayed P0301. Removed coil pack harness from metal bracket (possible grounding/sparking issue? and the P0301 code gone) now P0336 , p0420 andp0430 No Tach, Rough idle, Stabilitrak disabled. Next step is to try Crankshaft Position Sensor. This Engine has been burning oil since day 1, maybe clogged Cats... a/c still ice cold, drives like a caddy, near perfect condition and definitely NOT ready to retire the ol lady.....

I think i know what the issue is. my dad and i both have matching 2011 tahoes and we have had throttle body issues on both. the module for traction control is inside the throttle body as it’s an electronic throttle, can’t speak for stabilitrak. the rough idle, long crank, and TC all sound like they can be fixed with a new throttle body. the one on my tahoe right now is a knockoff and now i have all the same 3 codes, lights, and issues.

i will be replacing throttle body tonight. will provide an update to see if it works