2 New recalls

[Jack Christensen]

I had my 2019 LT Trail Boss serviced for the two latest recalls on Tuesday 12/17.

1.  Braking System

2.  Loose alternator cable

tonight 12/20 I had multiple braking system error codes light up my console.  Pics attached.  I attempted to drive down the street towards my house to see if I could ease home.  The brakes were stiff but got me home.  Very nervous and felt extremely unsafe.

 

GM is putting lives at risk!  I will be calling the Chevy dealer I went to on Tuesday first thing in the morning.  After reading this post, I am not confident they will fix the problem.  I saw where one of the posts mentioned getting a new truck. That’s where my gut is leading me.  I feel that GM should replace our trucks.  I can not believe we are having severe braking issues on brand new trucks.

 

when I got home, I turned my truck off for a few minutes and back on.  I did this twice.  The second time the brake service lights went off and the brakes felt normal again.  But the check engine light is still on.  Side note, one of the braking errors was also the trailer brakes.  I could only attach  2 pics...  Thankfully I am home, as it is too late to take to the shop.

 

I am extremely upset with GM...  And will not drive with my family in my truck until a resolution has been found!

[lapoolboy]

9 minutes ago, OnTheReel said:

These recalls are like the medication commercials where the side effects are worse than the disease. I rescheduled my appointment yesterday because I was sick. Think I’ll just cancel for now...

Wise man

[TLDLTD]

How long after having it reprogrammed did you have issues? Had mine today and drove quite a bit with multiple restarts no issues

 

 

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Left dealership, drove back to work and next start up the issues started. Now today we used the truck a lot and it’s every third start.

 

I’m taking the truck back to dealer next week and leaving there until they can fix it. Hoping to get a loaner - sucks but I can’t trust this thing. It’s a safety issue.

 

 

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[TLDLTD]

PEOPLE.....slow down!  Give GM some time to iron out all the kinks in the software with these recalls.  There is no need to jump up off the pot without flushing and run to the dealer.  I won't even consider it until I see LOTS of reports that everything is good to go (probably first quarter next year). 
 
My wife had a 2007 Honda Accord that had the grenading Takata airbags in it.  She traded that car in but the notices, e-mails, and phone calls kept coming anyway.  Yesterday, a blue-shirted "Honda Recall Team" guy came knocking on the door wanting to replace the air bags right then and there in our driveway!  I may wait until GM does the same thing with me for my truck!  [emoji23]

Why would GM do these recalls without knowing the effects. Seems they took my so far excellent truck and made it questionable.

Dealer forced this one on me...took in for oil change and they said they took car of the recalls while it was in [emoji2959]


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[Rocz3cqg]

On 12/20/2019 at 10:59 PM, AMPRG said:

I just came back from dealer and finished all recalls. Now I don't have front collision alert and break, pedestrian alert and break, lane keep assist, intellibeam,... 

I'm not sure what they did. They were supposed to just reprogram the brake system. 

Monday going back to the dealer

One of the recalls is to reprogram the front camera windshield module because it may not apply the Integrated Brake Assist when called by certain Safety Features. Have the dealership perform the relearn procedure for the front camera. If they dig deep enough, they will encounter the error code pointing to the relearn process. The other braking recall was to ensure the TC and ESC errors would light up on the dash to inform the operator. But the update must be disabling the Integrated Brake Controller at a time to place the vehicle in a manual brake [hard brake without power assist] which causes the operator to press the brake all the way down to hopefully stop the vehicle. GM really ought to pay attention to these forums and reach out to these customers because something is going to happen that is really bad. It has been by per luck that someone or something has not been hurt or damaged.

 

Brake System Overview
Note: ZF TRW�s Integrated Brake Control is a 1-piece module that eliminates the master cylinder, vacuum pump and associated hoses while incorporating electronic stability control, traction control and an electric motor to push hydraulic fluid to brakes at all four corners. The module is 13 lbs. (6 kg) lighter than the total weight of a conventional system and only requires about half the packaging space underhood.

The vehicles are equipped with a ZF TRW Integrated Brake Control (IBC), also known as a Brake System Control Module. The IBC is an electromechanical device that interprets and converts driver input and provides a corresponding hydraulic pressure output to activate a standard brake system according to driver demand. In an event of no electrical energy or failure condition the driver�s input is mechanically converted to a hydraulic pressure output.
Use DOT 4 Hydraulic Brake Fluid (GM Part No. 19299570, in Canada 19299571).
Electrical Component Operation

The Body Control Module (BCM) monitors the brake pedal position sensor signal when the brake pedal is applied and sends a high speed serial data message to the Brake System Control Module indicating the brake pedal position. The following electrical components are used:
Wheel Speed Sensors: Equipped with unique directional wheel speed sensors that can detect wheel direction as well as zero wheel speed. The wheel speed sensors are Active sensors that receive a 12 V power supply from the Brake System Control Module and returns an output signal to the module. As the wheel spins, the wheel speed sensor sends the Brake System Control Module a DC square wave signal. The Brake System Control Module uses the frequency of the square wave signal to calculate the wheel speed.
Multi-Axis Acceleration Sensor: The yaw rate, lateral acceleration and longitudinal acceleration sensors are combined into one multi-axis acceleration sensor, internal to the inflatable restraint sensing and diagnostic module. The Brake System Control Module receives serial data message inputs from the three sensors and activates Stability Control and Hill Hold Start Assist functions depending on multi-axis acceleration sensor input.

Multifunction Switch: The traction control switch is a multifunction momentary switch. The traction control and stability control are manually disabled or enabled by pressing the traction control switch.
Steering Wheel Angle Sensor: The Brake System Control Module receives serial data message inputs from the steering angle sensor. The steering wheel angle sensor signal is used to calculate the intended driving direction. The sensor is an internal part of the power steering gear.

Transmission Control Module: The Brake System Control Module receives high speed serial data message inputs from the transmission control module indicating the gear position of the transmission for Hill Start Assist and Hill Hold functions.

Vehicle Brake Enhancement Systems
Depending on options, the following vehicle brake enhancement systems are provided:
Power-Up-Self Test: The Brake System Control Module performs the first phase of the power-up-self test when the ignition is first turned ON. This phase consists of internal testing of the Brake System Control Module and electrical tests of system sensors and circuits.
Antilock Brake system : ABS provides the active control/modulation of brake fluid hydraulic pressure to the front and/or rear brake corner subsystems (brake torque control) to preclude wheel lock-up and enhance tire-to-road longitudinal braking traction. Avoidance of wheel lock-up provides the driver with the ability to maintain vehicle stability and steerability and minimizes vehicle stopping distance.
Brake Assist: Brake Assist provides additional brake pressure over the pressure provided by the conventional brake apply system.
Panic Brake Assist: Panic Brake Assist will apply the brakes more quickly when a panic brake situation is determined. Panic Brake Assist detects that the driver intent is to stop the vehicle as quickly as possible, but the driver does not apply sufficient brake pressure to do so. The feature will detect the driver intent then actively apply brake pressure to maximum pressure, activating the ABS system and stopping the vehicle as quickly as possible.

Hydraulic Fade Compensation: Based on a brake disc/pad temperature estimate, driver applied master cylinder pressure and vehicle deceleration rate, Hydraulic Fade Compensation will increase brake system pressure above driver applied brake pressure when the brake system determines a gross fade condition.

Rear Brake Boost: Rear Brake Boost provides rear hydraulic brake assist to ensure that all four corners are achieving maximum braking during ABS. When vehicle loading is heavily rear axle biased the rear brakes may not utilize all of the available road adhesion. Rear Brake Boost will provide additional pressure to the rear brakes when the front brakes ABS are activated and the rear wheels have low slip.
Electronic Pre-Fill: Electronic Pre-Fill is used to reduce the brake response time when the driver quickly releases the accelerator pedal. This is also used to support the use of low drag calipers.

 

[lapoolboy]

1 hour ago, TLDLTD said:

Why would GM do these recalls without knowing the effects.

 

Because they are rushed to get them out.  

[TLDLTD]

Dealer called me in to have the truck reflashed. Seems to have resolved the issues that the recall caused. Also, it seems to have more power then before. Will update if brake issue happens again.

 

 

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[Ashley6462]

21 minutes ago, TLDLTD said:

Dealer called me in to have the truck reflashed. Seems to have resolved the issues that the recall caused. Also, it seems to have more power then before. Will update if brake issue happens again.

 

 

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How many starts since reflash??? Please keep us updated I believe this is what my dealer did and it started again 35 hours and 10+ restarts later 

[RedMed385]

Had both recalls performed today. I asked prior to them starting, to skip the ESC flash and I was told no problem. During them doing the work the service advisor told me that the ESC flash wasn’t the problem. He told me there is a portion or “quiet” flash for the brake pad life problem that is causing the computer bricking/breaking.  Don’t know if anyone was told this?  I will be keeping an eye on this with fingers crossed since they went ahead with the ESC flashing anyways. 

[lapoolboy]

1 hour ago, RedMed385 said:

Had both recalls performed today. I asked prior to them starting, to skip the ESC flash and I was told no problem. During them doing the work the service advisor told me that the ESC flash wasn’t the problem. He told me there is a portion or “quiet” flash for the brake pad life problem that is causing the computer bricking/breaking.  Don’t know if anyone was told this?  I will be keeping an eye on this with fingers crossed since they went ahead with the ESC flashing anyways. 

What part of "skip the ESC flash" did he not understand??  I'd be pissed.

[TLDLTD]

How many starts since reflash??? Please keep us updated I believe this is what my dealer did and it started again 35 hours and 10+ restarts later 

 

Uggg not what I wanted to hear lol. So far about 8 restarts since for me. I don’t know how many restarts the dealer did when they were testing it.

 

 

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[Jricharc]

Mine did this once a few weeks back but hasn't done it since.  I will wait to take mine in after hearing about all the issues, these days the fixes are like phone updates there are always bugs in the initial updates.

[TLDLTD]

Dealer called me in to have the truck reflashed. Seems to have resolved the issues that the recall caused. Also, it seems to have more power then before. Will update if brake issue happens again.
 
 
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Disregard, first start up this morning the issue is back.


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[JT19HC]

Went to the dealer today to address the lane keep and forward collision / brake system not working since the brake recall.  Sat in waiting from 8am to 1030a and was told that they couldn't resolve the issue after trying to reflash and reprogram, and that GM wasn't open today for additional tech support.  Guess Im making another trip next week...... Getting a little tired of this.

[TLDLTD]

Dealer brought me a 2018 to use for the holidays while they figure this out.


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