Parking pawl/e-brake issue is BACK

[klutch14u]

So, I had the update done 2-3 months ago, been fine. It only happened to me (that I noticed) a few times. Suddenly over the past week, the brake is set every time I drive/park.

Went to move my truck out of the garage tonight and noticed it was on again, backed out to move a pull wagon in. Got back in the truck and it was on, again. Pulled the truck in, put it in park, shut the truck off taking notice if the brake light came on. As soon as I opened my door, the brake set......

Anyone else?

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[MavStangVa]

I found this description of the recall fix. It would appear you have an issue with the parking pawl and the truck is doing what it is supposed to do. Personally I set my brake every time because of an older vehicle with manual linkage that would sometimes not allow me to shift out of park due to pressure on the pawl.

The recall and remedy target the following specific issues:

• The Defect: In certain hybrid models, an internal park pawl might bind against a slider due to high friction and fail to engage when you shift the vehicle into Park.
• The Software Fix: The dealership updates the Secondary On-Board Diagnostic Module C (SOBDMC) software. This re-calibrates the system so that if the pawl fails to engage, the truck displays a shift system fault warning and automatically applies the electronic parking brake to prevent a rollaway.

 

[klutch14u]

I found this description of the recall fix. It would appear you have an issue with the parking pawl and the truck is doing what it is supposed to do. Personally I set my brake every time because of an older vehicle with manual linkage that would sometimes not allow me to shift out of park due to pressure on the pawl.

The recall and remedy target the following specific issues:

• The Defect: In certain hybrid models, an internal park pawl might bind against a slider due to high friction and fail to engage when you shift the vehicle into Park.
• The Software Fix: The dealership updates the Secondary On-Board Diagnostic Module C (SOBDMC) software. This re-calibrates the system so that if the pawl fails to engage, the truck displays a shift system fault warning and automatically applies the electronic parking brake to prevent a rollaway.

Is that the recall from a few months ago? I had that update done, hadn't had a problem until the past week/few days, now it seems to be every time I drive.

 

[HeyBales]

Hey - even though it says due to high friction - maybe you just seem to making everything land in the right spot not to engage it too.

What are the odds!

Go get some lottery tickets!

 

[MavStangVa]

Is that the recall from a few months ago? I had that update done, hadn't had a problem until the past week/few days, now it seems to be every time I drive.

Yes it would be that recall. Note the fix was for the parking brake to engage if the parking pawl failed to engage which sounds like what is happening with your truck. If the parking brake was not engaging your truck could roll away. If it were my truck I would have already called for an appointment to have it looked at. The symptoms you describe makes me think the transmission has a problem.

 

[HeyBales]

Yes it would be that recall. Note the fix was for the parking brake to engage if the parking pawl failed to engage which sounds like what is happening with your truck. If the parking brake was not engaging your truck could roll away. If it were my truck I would have already called for an appointment to have it looked at. The symptoms you describe makes me think the transmission has a problem.

I think that's the known point - there is a tranny issue.

And the software update gets around it by using the parking brake when it happens.

Precisely to avoid needing to address the root cause of cracking the tranny. Very expensive.

@klutch14u
It would be interesting after the auto-EPB usage, to see if it would roll. I'm wondering if a sensor issue of confirming the pawl moved enough, or it really didn't and it could roll:

Just disengage the EPB with foot on brake, release brake pedal. Door likely needs to be closed.
If it auto-engages immediately, need to fool it, hopefully.
Seat belt on (so no auto-park engaging).
Normal foot on brake and start vehicle.
Release EPB. Release brake pedal.
Hope it doesn't auto-engage quickly - see if it rolls.
Hopefully a very slight incline - too much and the function of auto-EBP for incline comes into play.

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