GM Truck & SUV Recalls – Brake Problems
GM recalls 638,000 SUVs, pickups over unintended braking issues
October 2019 – Detroit Free Press – General Motors is recalling about 638,000 SUVs and pickups for a defective sensor that could cause braking problems.
Here’s the problem: If a wheel-speed sensor fails, a software error in the vehicle’s electronic-brake control module can cause the driveline-protection system to activate. This happens when the vehicle’s electronic transfer case is set to four-wheel drive or automatic mode, and being driven between 41 and 60 mph.
If the driveline-protection system activates, there could be unintended braking on the wheel on the opposite side of the failed sensor, said GM. As a result, the vehicle could pull to one side, possibly crashing.
GM said drivers can eliminate this risk by driving in two-wheel-drive mode until the recall repair is performed.
If a wheel-speed sensor fails, the vehicle’s Electronic Stability Control and ABS malfunction indicator warning lamps will illuminate and the vehicle’s driver information center will display a “Service Stabilitrak” message, said GM.
But Reuters reported that GM found 150 field claims alleging the condition caused unintended braking or lateral-vehicle motion.
2015-2020 Chevrolet Suburban
2015-2020 Chevrolet Tahoe
2015-2020 GMC Yukon
2014-2018 Chevrolet Silverado 1500
2014-2018 GMC Sierra 1500
Report Receipt Date: OCT 25, 2019
NHTSA Campaign Number: 19V761000
Component(s): ELECTRONIC STABILITY CONTROL , SERVICE BRAKES , SERVICE BRAKES, HYDRAULIC
Potential Number of Units Affected: 638,068
Manufacturer: General Motors LLC
OCTOBER 2019 — General Motors LLC (GM) is recalling certain 2015-2020 Chevrolet Suburban, Tahoe, and Yukon, and 2014-2018 Chevrolet Silverado 1500 and GMC Sierra 1500 vehicles equipped with a 5.3-liter engine, a 3.08-ratio rear axle and four-wheel drive. If a wheel-speed sensor fails, the Electronic-Brake Control Module (EBCM) software may activate the driveline-protection system. Unintended activation of the driveline-protection system will cause unintended braking on the wheel on the opposite side of the failed sensor, causing the vehicle to pull to one side unexpectedly, increasing the risk of a crash. GM will notify owners, and dealers will reprogram the EBCM, free of charge. The manufacturer has not yet provided a notification schedule. GM’s number for this recall is N192261050.
General Motors is recalling nearly 3.8 million big pickup trucks and SUVs
August 2019 – AP – General Motors is recalling nearly 3.8 million big pickup trucks and SUVs in the U.S and Canada to fix a brake problem.
GM says that as it ages, the pump in the power-assist brakes can put out less vacuum power than needed, increasing stopping distance and the risk of a crash.
GM says the problems occur rarely and mostly at low speeds like driving in parking lots. Even with the problem, the brakes “continue to function and exceed the requirements of the appropriate federal motor vehicle safety standard,” GM spokesman said.
The vacuum pump is lubricated with engine oil that flows through a filter screen. In some of the trucks, oil sludge or other debris can clog the screen, reducing oil flow and causing the pump’s vacuum output to drop, GM spokesman said.
The trucks, he said, have a secondary power brake assist system which works when there are problems with the main system, but it is limited at lower speeds. The reprogramming will activate the secondary system faster.
GM isn’t replacing the pumps because pump failures are rare and already are covered by an extended warranty, GM spokesman said. “This remedy will improve brake performance in any situation where brake vacuum drops,” he said.
Drivers could feel a vibration in the brake pedal or a change in pressure required to push the brake pedal if their trucks have the vacuum pump problem. If the problem surfaces, owners will see a message on their dashboard telling them to service the brake assist system, GM spokesman said.
The recalled vehicles and model years are as follows:
2014-2018 Chevrolet Silverado
2014-2018 GMC Sierra
2015-2017 Cadillac Escalade
2015-2018 GMC Yukon
2015-2018 Chevrolet Suburban
2015-2018 Chevrolet Tahoe
RECALL Subject: Vacuum Pump May Decrease Power Brake Assist , 1 INVESTIGATION(S)
Report Receipt Date: SEP 06, 2019
NHTSA Campaign Number: 19V645000
Component(s): SERVICE BRAKES, HYDRAULIC
Potential Number of Units Affected: 3,456,111
Manufacturer: General Motors LLC
SEPTEMBER 2019 – General Motors LLC (GM) is recalling certain 2015-2017 Cadillac Escalade, 2014-2018 Chevrolet Silverado, GMC Sierra, 2015-2018 Chevrolet Suburban, Tahoe, GMC Yukon vehicles. The amount of vacuum created by the vacuum pump may decrease over time. As the vacuum level drops, the brake assist decreases, increasing braking effort, extending the distance required to stop the vehicle, thereby increasing the risk of a crash. GM will notify owners, and dealers will reprogram the Electronic Brake Control Module, free of charge. The manufacturer has not yet provided a notification schedule. GM’s number for this recall is N192268490.
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