Power Assist Hydraulic Brake Problems of GMC Sierra 2500

Sudden and complete failure of brakes and steering. Started vehicle, placed in reverse, unable to stop or steer. No emergency assist from accumulator, manual brakes only. Vehicle was placed in neutral, then stopped with e-brakes and service brakes. Power steering reservoir overflowing, puddle on garage floor of fluid, fluid gushed when cap removed. Vehicle towed to dealer where it operated normally! dealer unable to diagnose at time of this writing. Similar complaint from relative with the exact same vehicle, had same thing happen 4 times. Hydro-boost system on a diesel 2500 hd.

See all problems of the 2006 GMC Sierra 2500 🔎.

Truck has been in dealer numerous times for severe noise of power steering pump, loss of brake boost and steering assist at low speeds. Pump was replaced and noised disappeared for just over 2 weeks and started again. Dealer explained that gm is aware of problem, but is only taking calls about the problem from one area code while they try to isolate. Dealer then replaced the steering gear with no correction of problem. At a standstill, turning the steering wheel about 3/4 turn results in complete loss of steering assist and sometimes brake boost, plus excessive pump noise. Dealer is now trying to tell me this is normal. There is a technical bulletin on this problem. Gm has instructed dealers not to replace the power steering pump. As they have received too many pumps under warranty that appear to have no problem. Driving the vehicle at 1200 rpm and steering right or left will generate a groaning noise that drowns conversation in the cab and at times results in reduced or failed brake boost. The same loud groaning noise occurs when slowing the vehicle from highway speeds without any turning of the steering wheel, as the engine rpm falls through the 1200 rpm range. Sounds like a hydraulic system with air in the system, low fluid or being push to over-capacity. Gm is not being responsive to the excessive number of customer complaints. I know others with the same problem on several years of 2500hd duramax trucks. It is not at all difficult to find others with this exact same complaint. The noise appears to be an under capacity hydraulic system for power steering and brake boost. Gm is either ignoring the problem or hoping the problem trucks will expire warranty. More owners need to complain and force a recall to repair this defect in design. Contrary to my dealer's assertion, this is not normal. I have been driving long enough to know "normal" and a "problem Dodge" when I see it.

See all problems of the 2005 GMC Sierra 2500 🔎.