Long burnout this morning, now PO609 check engine light code.

[buddyhotrod]

Would not have posted this but could find nothing from previous discussion in regard to the PO609 code on the 2007 to 2014 Tahoe’s.
About 4 days ago I installed the Superchips Flashpaq 2845 F5 and have only disabled the AFM active fuel management and switched to performance mode.
Speed and rev limiter along with everything else has been left stock.
None of the parameters have been changed.

Was making a right turn this morning out in the country and stood on it from a stand still.

Roasted the right rear tire pretty good.

Light came on about 10 mins later.
Guessing a wheel speed sensor got spiked, at least that’s my wishful thinking.
The ECM is still in learn mode from when I had the batteries disconnected just a few days ago so there are a couple of not readies in the ECM.

Anyone ever heard of this code before? PO609

Dwight?
Swathdiver Treasure Island?

 

[swathdiver]

Looking up that code in the shop manual, I would hose that area down. It probably got dirty or knocked loose.

There are two symptom codes that further aid in diagnosis. 00 and 5A

 

[buddyhotrod]

Wow
Thank you for taking the time to do that.

Are you talking about hosing the wheel speed sensor area?

 

[swathdiver]

Wow
Thank you for taking the time to do that.

Are you talking about hosing the wheel speed sensor area?

Yes, it probably got real dirty, you can crawl under there and see if it was knocked loose. If so, push it back in place.

 

[Rocket Man]

Yes, it probably got real dirty, you can crawl under there and see if it was knocked loose. If so, push it back in place.

Covered in melted rubber lol.

 

[08HoeCD]

Lol

 

[Scottydoggs]

https://www.obd-codes.com/p0609

this is not a abs code. its a speed sensor, lives in the tranny and there might be two in the transfer case. how fords make the awd bs work in exploders, ive never looked that close at my hoe, but we might have em there too.

 

[Rocket Man]

https://www.obd-codes.com/p0609

this is not a abs code. its a speed sensor, lives in the tranny and there might be two in the transfer case. how fords make the awd bs work in exploders, ive never looked that close at my hoe, but we might have em there too.

True it is a vehicle speed signal problem but the vss relies on the speed sensors in the trans, tcase and wheel speed sensors aka abs sensors. It could be any of them.

 

[iamdub]

These 4L60s have two speed sensors in the trans- one for the input and one for the output. I think the output speed sensor is also the main VSS for the speedometer, etc. The PCM compares the input to the output to measure slippage when calculating for clutch engagement and torque management. Maybe the torque converter got a little loose or too warm during that tire roast? Why it would come on 10 minutes later, I don't know. It may not even be related to that roast and be pure coincidence. Considering the other factors- recently tuned, PCM still relearning, etc. and if it isn't driving any differently, I'd say the best you can do for now is just make sure the sensor is securely plugged in and no harnesses are loose and/or contacting anything.

 

[livingez_123]

These 4L60s have two speed sensors in the trans- one for the input and one for the output. I think the output speed sensor is also the main VSS for the speedometer, etc. The PCM compares the input to the output to measure slippage when calculating for clutch engagement and torque management. Maybe the torque converter got a little loose or too warm during that tire roast? Why it would come on 10 minutes later, I don't know. It may not even be related to that roast and be pure coincidence. Considering the other factors- recently tuned, PCM still relearning, etc. and if it isn't driving any differently, I'd say the best you can do for now is just make sure the sensor is securely plugged in and no harnesses are loose and/or contacting anything.

The 4L80e has the 2 speed sensors on the trans, not the 60e. I have one sitting in front of me!

 

[iamdub]

The 4L80e has the 2 speed sensors on the trans, not the 60e. I have one sitting in front of me!

You have one for a GenIV setup sitting in front of you?

 

[buddyhotrod]

Hello Friends

Im starting to get a little desperate at this point.
State inspection runs out soon and I will no longer legally be allowed to drive the Tahoe if it will not pass the OBD State test.

Im still getting the PO609 and sometimes the PO455.

PO609 is VSS vehicle speed sensor
PO 455 is a Large EVAP leak. I have a smoke machine coming soon..

The PO609 still baffles my little brain.

Today 5-31-2019 I removed each wheel speed sensor and cleaned off any metal shavings.

Also removed the speed sensor at the tail of the transmission and checked the pigtail on the plug.

Also followed the rear speeds sensor wires to the top of the transmission.

Used a snap - on scanner and watched each wheel speed sensors and they all show the mph as did the vehicle speedometer.

I guess I will start throwing parts at it. Starting with the two speed sensors in the transmission.


Does anyone have any tips.

I cannot find anything on the PO609



This is a 2007 Tahoe 2wd 5.3 flex fuel.

Has the superchips active fuel management deactivated.

The Snap-On scanner showed VSES Active - No
and VSES Failed - Yes

 

[buddyhotrod]

ALL Data just makes me want to vomit.

 

[Scottydoggs]

https://www.engine-codes.com/p1682_chevrolet.html

https://www.obd-codes.com/p0609

both of these say possible bad pcm. the 609 is say it could be a controller, i have no idea where they would live, unless they mean the pcm/ecm what ever you like to call it.

 

[buddyhotrod]

Success at last.

Sunday 6-2-2019 Disconnected both batteries, connected pos to neg leads and turned on ignition along with a few accessories in hopes of draining the capacitors, Cleaned the battery terminals and the leads, Disconnected all plugs from computer and plugged them all back in, removed the entire fuse box and reinstalled it, removed every fuse to check for blown fuses, reinstalled them all. Removed body to frame ground and cleaned surface to bare metal and reinstalled body to frame ground wire. Installed new A/C delco Speed sensor at the tail section of the transmission. Reconnected batteries. Cleared codes.

Drove the Tahoe about 30 miles today and still no check engine light or codes.
Ran up to the State inspection station and plugged into the states computer, No codes and only one incomplete.
Went ahead with inspection and passed. No codes.

So relieved.

Not so sure the speed sensor in the transmission was the issue, possibly just unplugging the various plugs and reconnecting them may have given them better contact along with the removal and reinstall of the fuses and grounds could have helped with better cleaner contact.

Hope this helps someone else down the line.

 

[Rocket Man]

Awesome news!