Question about 2004 Chevrolet Silverado 2500HD

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I have a 2004 2500 hd silverado with duramax engine. the vehicle intermidentaly lunges with air conditioning on and brake applied.

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It sounds like the computer is compensating the idle when the a/c compressor cycles on. The compressor cycles on and off when the a/c is on, which is normal. When the compressor kicks on, it puts an additional load on the engine, which in turn lowers the idle, especially at idle sitting at, say, a red light. Having the brakes on also adds another load to the engine as it uses a lot of engine vacuum to keep the brakes applied. When the engine surges, like your describing, that is the trucks computer sensing the additional load put on the engine, and is adjusting the idle higher to compensate for it. Theres really not a lot you can do about it, unless maybe switch off the a/c at red lights. I should add that if it's a severe "lunge" or surge, enough that your fighting to keep the truck from moving, I would check for maybe a vacuum leak, or even possibly take the truck to a dealer and have it checked over. Hope this helps.

Posted on Jul 01, 2009

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Posted on Jan 02, 2017

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2006 chevy silverado duramax hd 4WD has codes u1016 /c0035/co201/po673/675/677 but runs great


DTC P0671: Cylinder #1 Glow Plug Control Circuit
DTC P0672: Cylinder #2 Glow Plug Control Circuit
DTC P0673: Cylinder #3 Glow Plug Control Circuit
DTC P0674: Cylinder #4 Glow Plug Control Circuit
DTC P0675: Cylinder #5 Glow Plug Control Circuit
DTC P0676: Cylinder #6 Glow Plug Control Circuit
DTC P0677: Cylinder #7 Glow Plug Control Circuit
DTC P0678: Cylinder #8 Glow Plug Control Circuit

Circuit/System Description
The glow plug controller has the ability to perform internal checks, an open or a short to ground on each of the glow plug circuits. If the glow plug controller senses a problem in a glow plug circuit, the glow plug on the affected cylinder will be disabled and the glow plug controller will send an error message to the engine control module (ECM). If this condition exists, the DTC will set.
Conditions for Setting the DTC
The glow plug controller detects that the glow plug control circuit is open, shorted to ground, or has more than 1 ohm of resistance.

Circuit/System Verification
Verify that DTC P064C is not set.
If DTC P064C is set, refer to DTC P064C.
Ignition ON, engine OFF, observe the scan tool Glow Plug 1-Glow Plug 8 parameters. All 8 Glow Plug parameters should closely match each other.
Refer to Testing for Intermittent Conditions and Poor Connections if you cannot duplicate the conditions.
Engine running, observe the DTC information with a scan tool. DTCs P0671-P0678 should not set.
Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

DTC C0035 Left Front Wheel Speed Sensor Circuit
DTC C0201 Antilock Brake System (ABS) Enable Relay Contact Circuit
The system relay, located within the electronic brake control module (EBCM), supplies battery voltage to all of the valve solenoids and to the ABS pump motor. When the relay contacts close, the EBCM monitors the voltage supplied to the valve solenoids and compares this voltage to monitored ignition voltage.

Jul 30, 2016 | Cars & Trucks

1 Answer

When you apply brakes the vehicle stops then lunges forward


your brake pads could be low and this causing this issue... Replace the pads.. There should be about 1 CM of "meat" on both the inner and outer pad

Jan 20, 2014 | 2004 Ford Explorer Sport Trac

1 Answer

2002 chevy silverado 2500 hd with duramax no brake or steering power. do I need to replace or repair hydro booster?


It definitely sounds like the hydro booster. There are videos on YouTube that shows you how to do either. Depending on your skill level will determine which one you do. The main issue is bleeding the air out of the booster. It can be difficult. You will also need to bleed your brakes completely afterward. GMs are notorious for having the hydro boosters die on them.

Sep 09, 2017 | 2002 Chevrolet Silverado 2500HD

1 Answer

I have a 2004 duramax, while driving the brakes seized up on all four, I have low fluid in power stearing and notice what I thought was a vacume hose for brake system, goes directly in the back of resavor...


Hello Hyde Gillen,

What you don't know...

There are DIFFERENT types (other than vacuum )
of BRAKE BOOSTERS...
More Information for ACDELCO 1780683

YOURS is HYDRAULIC assisted... meaning... when
your HYDRAULIC pump fails... (not power steering)
EXACTLY like AIR-BRAKES... (Compressor fail)...

The BRAKES get applied...!!

>> AS designed...!! <<

You CANNOT let your HYDRAULIC systems fail...

You cannot even steer your vehicle...
(don't worry about yourself)... TRY WORRING about
the OTHERS innocents you are putting in DANGER.

I think you are on the RIGHT TRACK...
truck is fine... YOU just need to expand your
understanding of AUTOMOTIVE mechanics.

Good work... KEEP STUDYING.

Carnac the Magnificent

Jan 05, 2018 | 2003 Chevrolet Silverado 2500HD

1 Answer

2003 chevy duramax 6.6 liter. If you roll down the windows and go to roll them back up the gauges go crazy and the lights on the doors go off and windows wont roll up. The navigation/temp on the rear view...


Sounds like you may have a ground problem , or a BCM - body control module , or serial data network issues . Do you have knowledge of wiring diagrams an using a DVOM - digital volt ohm meter to test electrical circuit's ? Do you know anything about automotive electronic control modules , class 2 data network's?
2003 chevy duramax ??? What model , silverado , suburban What ??? Looking at wiring diagrams for silverado HD 2500 , i see these vehicles also have module's inside the doors . Free wiring diagram's here http://www.bbbind.com/free_tsb.html
Enter vehicle info . year , make , model an engine size. Under system click on body & accessories ,then under subsystem click power window's . Click the search button then the blue link . With a problem like this your first step should be to hook up a GM tech 2 scan tool or equivalent ! These are the only ones that can check for communication problems an DTC'S - diagnostic trouble code's in all the modules on the vehicle .

Buick Class 2 Operation Diagnosis 1998
012 GM Class II Communications
Electric Testing Techniques You Need to Know


Jan 06, 2018 | Cars & Trucks

1 Answer

Press on brake and stering locks up


Steering locking up is not normal. You have a hydro-boost assist power steering system on your vehicle. It uses the power steering pump to apply hydraullic pressure to assist in braking. The hydro-boost system may have a problem, pressure or restriction problem. Have dealer check booster and current updates to check valves, there may be a service bulletin for your concern.
Hope this helps.

Mar 02, 2010 | 2007 Chevrolet Silverado 2500HD

1 Answer

2002 chevy hd duramax 4x4


Sounds like the PRNDL switch on the side of the transmission. Be sure and clear the code before trying to start after replacing it.

Jan 23, 2010 | 1999 Chevrolet Silverado 1500

1 Answer

2007 chevy silverado 2500 hd duramax shut down


mo me it sounds like low fuel volume i would check my lift pump

Sep 30, 2009 | 2007 Chevrolet Silverado 2500HD

2 Answers

2500 hd duramax crew cab 4 WD pulls right. Both


First try rotating the tires to the rear. Does it go away? If you apply the brakes does it pull to the left? Could be a draging caliper or the slides may be hanging up.

Aug 03, 2009 | 2004 Chevrolet Silverado 2500HD

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