GMC

GMC troubleshooting questions? Ask a mechanic for answers

Ask an Expert,
Get an Answer ASAP!

This answer was rated:

When we apply the brakes, we lose power steering. Power

When we apply the...

When we apply the brakes, we lose power steering. Power steering works perfectly while driving until we hit the brakes

Mechanic's Assistant: When was the fluid last checked? Have you heard any whining noises while turning the wheel?

We topped the fluid off yesterday and still have the issue. With the wheels locked in either direction, there is a whine like you typically hear

Mechanic's Assistant: What is the model/year of your GMC?

2007 GMC Sierra 2500

Mechanic's Assistant: Are you fixing your Sierra yourself? What have you tried so far?

Yes we have our own shop and work on everything but vehicles. We work on our shop trucks as we just put a new transmission in this truck

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

I pulled the return line of the hydro boost and I have fluid coming out of the nipple the return line connects to Other than that I think that is it

Show More
Show Less
Ask Your Own GMC Question
Answered in 10 minutes by:
3/27/2018
JFN1
JFN1, ASE Certified Technician
Category: GMC
Satisfied Customers: 5,628
Experience: GM Master Technician
Verified

I've never run into this, but since the booster gets hydraulic pressure before the steering gear, it seems to me that the pump itself is suspect.

There are tests that can be performed, but they require a specialized power steering pressure/volume tester. What you're describing is a pump that can't keep up with the hydraulic demand when the booster is functional, and since there is a bias to booster before steering, I think the pump is the component at fault here.

Please take a moment to rate my answers by clicking on the stars at the top of the page, that's how I get compensated. Let me know if you need anything else.

JFN1
JFN1, ASE Certified Technician
Category: GMC
Satisfied Customers: 5,628
Experience: GM Master Technician
Verified
JFN1 and 87 other GMC Specialists are ready to help you
Ask your own question now
Was this answer helpful?
Ask JFN1 Your Own Question
JFN1
JFN1
JFN1, ASE Certified Technician
Category: GMC
Satisfied Customers: 5,628
5,628 Satisfied Customers
Experience: GM Master Technician

JFN1 is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here.

DianeDallas, TX

< Previous | Next >

Meet the Experts:

Gm Tech (Cam)

Gm Tech (Cam)

GMC Mechanic

1,696 satisfied customers

GM Grand Master Technician 2007. 14 year experience.

Gary

Gary

ASE Certified Technician

1,557 satisfied customers

GCM master tech over 25 years

Dave Nova

Dave Nova

GMC Technician

929 satisfied customers

ASE Master Certification. GM World Class Certification

Chris (aka-Moose)

Chris (aka-Moose)

GMC Technician

583 satisfied customers

16 years of experience

Ron Z.

Ron Z.

- GMC Tech -

259 satisfied customers

18+yrs experience. State Inspector & GMC Diagnostics/Repair

George H.

George H.

ASE MasterTechnician

227 satisfied customers

15+ Years ASE Master Technician with Level 1 Certification

Don - Mo Lurch

Don - Mo Lurch

ASE Certified Technician

218 satisfied customers

GM, GMC, Chevrolet Cert., Heavy Line Mech, Race Shop Owner, Mobile Electronics

< Previous | Next >

Related GMC Questions
2001 yukon Denali 6.0. Power steering shaft pulley shaft
2001 yukon Denali 6.0. Power steering shaft pulley shaft broke. Replaced pump, still no power steering. Put a second pump on, still no power steering. Fluid doesn't move in reservoir. What's my next s… read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
25 satisfied customers
2005 gmc Sierra 2500 v8 6.0. Put in a new starter jumped
2005 gmc Sierra 2500 v8 6.0. Put in a new starter jumped battery, all good. Next day go to start up all is dead. Go get new battery thinking that might be problem still nothing. Fusable link is good. … read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
I have a 2018 GMC Sierra 2500 HD Denali with the gas engine
Hi Pearl.... I have a 2018 GMC Sierra 2500 HD Denali with the gas engine with only 1200 mile on it and have a coolant leak. … read more
JFN1
JFN1
ASE Certified Technician
5,628 satisfied customers
Working on a 2003 GMC Sierra 2500 HD with a 6.0 L gas
Working on a 2003 GMC Sierra 2500 HD with a 6.0 L gas engine. We are pulling code P0120 and P2135. We reset these codes and they come back immediately. The vehicle was towed in. Please advise. Thank y… read more
Ron Z.
Ron Z.
- GMC Tech -
Vocational, Technical or Trade Scho
259 satisfied customers
I got a new power steering pump for my gmc 2500 and it comes
I got a new power steering pump for my gmc 2500 and it comes with two pipes on the housing my old one only had one What should i do … read more
kalamykid
kalamykid
Pactor automotive
Vocational, Technical or Trade Scho
97 satisfied customers
I have my GMC acadia 2008, recently changed power steering
I have my GMC acadia 2008, recently changed power steering seals and radiator pipe,Oil Pressure Switch, Tensioner etc..Now after re fixing, DIC showing warning signals if Check engine light & stabilit… read more
roy
roy
Associate Degree
3 satisfied customers
My e-brake light won't turn of and I believe the e-brake
My e-brake light won't turn of and I believe the e-brake won't release. The ABS light won't go off either. This just started yesterday.… read more
Todd Audette
Todd Audette
Automotive Technician
Vocational, Technical or Trade School
358 satisfied customers
Lost power steering and says to to service all wheel drive
lost power steering and says to to service all wheel drive system … read more
Gary
Gary
ASE Certified Technician
Vocational, Technical or Trade Scho
1,557 satisfied customers
2008 3500 duramax new power steering pump makes a vibrating
2008 3500 duramax new power steering pump makes a vibrating noise some times not breaking just driving along … read more
eauto
eauto
self employed
High School or GED
74 satisfied customers
My 2001 gmc sierras power steering went out help. Whining
My 2001 gmc sierras power steering went out help JA: When was the fluid last checked? Have you heard any whining noises while turning the wheel? Customer: Yes whining while in a drive thru JA: Are you… read more
Gary
Gary
ASE Certified Technician
Vocational, Technical or Trade Scho
1,557 satisfied customers
Got a 2002 envoy changed rack and power steering hoses want
got a 2002 envoy changed rack and power steering hoses want start but it will turn over..changed fuel pump … read more
Mechanic01
Mechanic01
2,388 satisfied customers
2008 GMC Sierra 2500 HD. Over heats occasionally and
2008 GMC Sierra 2500 HD. Over heats occasionally and intermittently.first time it happened I was pulling a camper the heat guage went to 125c . I slowed down the truck shifted down and the guage dropp… read more
Gary
Gary
ASE Certified Technician
Vocational, Technical or Trade Scho
1,557 satisfied customers
2011 GMC Sierra 2500 HD transmission intermittently sticks
2011 GMC Sierra 2500 HD transmission intermittently sticks in third gear. Line that tells what gear your in disappears. Shifts hard in reverse an drive when this happens.… read more
Gary
Gary
ASE Certified Technician
Vocational, Technical or Trade Scho
1,557 satisfied customers
2007 GMC Sierra 2500 HD classic 6.6L duramax diesel. At
2007 GMC Sierra 2500 HD classic 6.6L duramax diesel. At 58,500 miles threw code P0403 my mechanic did PCM software update per TSB 06-06-04-066D. Was ok for a while then threw same code at 60,500 miles… read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
25 satisfied customers
I have a 2005 GMC Sierra 2500 HD Crew Cab 6.0 L 65,000 miles
I have a 2005 GMC Sierra 2500 HD Crew Cab 6.0 L 65,000 miles The problem is the rear windows will not power down i have 13.5 volts across the red and black wires on both rear switches and i have power… read more
Chris (aka-Moose)
Chris (aka-Moose)
GMC Technician
Vocational, Technical or Trade School
583 satisfied customers
06 GMC Sierra 2500 HD Duramax. Rear ABS coming on just as
06 GMC Sierra 2500 HD Duramax. Rear ABS coming on just as vehicle is rolling to a stop. Harsh 2-1 downshift occurs at same time. No lights on dash. ????… read more
Anthony Uzmack
Anthony Uzmack
ASE Certified Service Technician
Automotive Technology
40 satisfied customers
04 Sierra 2500 6.0 4X4 It falls into reduced power, Cleaned
04 Sierra 2500 6.0 4X4 It falls into reduced power, Cleaned throttle body, No help. Scanned and found code P1516 and P1516A. What do we need to do?… read more
fordguy4u
fordguy4u
Automotive Tech
Vocational, Technical or Trade Scho
70 satisfied customers
Wont start!! it cranks, 2002 gmc sierra 2500 hd new injector
I put a fass 150 lift pump. rebuilt the filter head. new fuel filter new injectors and new cp3 Cranks at 180 rpm and I only get 1.2kpsi rail pressure … read more
Chris (aka-Moose)
Chris (aka-Moose)
GMC Technician
Vocational, Technical or Trade School
583 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x