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2004 GMC Sierra Hybrid GMC Hybrid Power Steering

Tiny
GDUDMAN
  • MEMBER
  • 2004 GMC SIERRA HYBRID
  • V8
  • 4WD
  • AUTOMATIC
  • 110,000 MILES
The Power Steering/Brakes Hydraulic pump is not operating. I have fluid, the pump is not operating and I have 37-40 volts at the plug.

Is ther a control circuit that can be troubleshot or can the pump be checked before I spend 500 bux for a new pump
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Friday, March 5th, 2010 AT 4:43 PM

3 Replies

Tiny
MATHIASO
  • MECHANIC
  • 1,209 POSTS
Hello gdudman

If you have 37-40 volt at the motor and the pump is not working, check for continuity between the motor and the pump.
If there is continuity, replace the pump.
If there is no continuity, search for an open between the two.
The hydraulic pressure is provided by the pump driven by the electric motor.
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Saturday, March 6th, 2010 AT 7:23 PM
Tiny
GDUDMAN
  • MEMBER
  • 2 POSTS
I replaced the pump and still no-go. Is there a control circuit or module that controls this
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Wednesday, April 21st, 2010 AT 1:59 PM
Tiny
MATHIASO
  • MECHANIC
  • 1,209 POSTS
To be more specific I have the following
 Sierra 1500 4WD
 Sierra 2500 4WD
 Sierra 2500HD 4WD
 Sierra 3500 4WD

tell me which one is yours.
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Thursday, April 22nd, 2010 AT 1:13 AM

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