20 Most Recent 1999 Chevrolet Silverado 1500 Questions & Answers

Low voltage on the instrument bus

1999 Chevrolet... | Answered on Sep 27, 2018


Appreciate the "Ask Me".

To my knowledge, Cruise Control would be relatively difficult to diagnose without a scan tool attached to the control module to read the error codes. Additionally, car versions in my country seldom have such a device since our roads are narrower and travel distance is not that great.

Though most known causes are:
  • the connector to the module;
  • loose brake pedal/switch;
  • loose clutch pedal/switch (for manual transmission);
  • vacuum line to actuator (most likely), vacuum actuator, diaphragm, control valve.
Other possible components to check are:
  • the control module itself (bolted to the firewall);
  • control cable or linkage;
  • speedometer sensor;
  • steering wheel controls switches;
  • throttle position sensor.
As posted above, quite a number of possibilities. Any other indications, speedometer OK; abnormal throttle responses; abnormal idling, brake light always ON, slack in the accelerator/gas pedal? Was it cutting in/out before? Was there any recent repair work done on the engine before the cruise control cut out?

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

1999 Chevrolet... | Answered on Sep 20, 2018

drain the oil from the front diff and check for metal flakes
If you have flakes --diff problems
if the oil is clean then look else where --like cv joints or "U" joints in drive shafts

1999 Chevrolet... | Answered on Aug 25, 2018

Just for fun,clamp off the heater hoses,just squeeze them flat in place to stop the hot coolant flow through the heater core.Take it for a spin and see if the a/c stays cold.Sometimes with increased hot coolant flow through the heater core with increased engine rpm (driving) and a leaky air flow door in the a/c heater assembly,it can be hard to keep the a/c air cold.

1999 Chevrolet... | Answered on Jun 28, 2018

This is an extremely difficult problem you have the biggest issue is the door won't open .I'm guessing you have a key less entry system if so can you hear the motor move for the lock in the door dose it have power dose the window work up and down .
This will tell you if the problem is electrical or mechanical if the motor is bad you will hear nothing if the clip broke or popped off.it will make noise.
Worse case you will have to take the other door apart take a close look at how it works then drill a hole in the broken door from the inside at a spot ware you can talk a screw driver and manually pop the lock open.
Well I didn't say it would be easy but if you look closely anyone could do it.

1999 Chevrolet... | Answered on Mar 23, 2018

The ABS unit should have the connection IDs embossed into the casting at every line connection.You are going to HAVE TO determine every connection line going to every component to make this work.

1999 Chevrolet... | Answered on Mar 21, 2018

This will set C (chassis) codes. You need to start there as the encoder motor (what performs the electronic shifting for the T-case drive modes {4-hi,2-hi-4lo}) will set codes that will enable you to quickly confirm if the encoder motor is indeed the problem. This is very common given the age of the vehicle.

1999 Chevrolet... | Answered on Mar 08, 2018

It is likely that you'll need to replace the temp door actuator, more likely it is bad than the temp control.

1999 Chevrolet... | Answered on Mar 07, 2018

Pull on the buckle to increase the slack in the belts.

1999 Chevrolet... | Answered on Mar 01, 2018

Your best bet , take to a qualified repair shop that has proper diagnostic testing tool
DTC B2725 ATC Mode Switch Circuit Malfunction
DTC C0300 Rear Speed Sensor Malfunction
DTC C0305 Front Speed Sensor Malfunction
DTC C0308 Motor A/B Circuit Low
DTC C0309 Motor A/B Circuit High
DTC C0310 Motor A/B Circuit Open
DTC C0315 Motor Ground Circuit Open
DTC C0323 T-Case Lock Circuit Low
DTC C0324 T-Case Lock Circuit High
DTC C0327 Encoder Circuit Malfunction
DTC C0367 Front Axle Control Circuit High
DTC C0374 General System Malfunction
DTC C0376 Front/Rear Shaft Speed Mismatch
DTC C0387 Unable to Perform Shift
DTC C0550 ECU Malfunction
DTC C0611 VIN Information Error

1999 Chevrolet... | Answered on Feb 19, 2018

Which one of these 4X4's does your vehicle have ?
Transfer Case - NVG 246-NP8 (Two Speed Automatic)
Transfer Case - NVG 261-NP2 (Two Speed Manual)

1999 Chevrolet... | Answered on Feb 18, 2018

Number one you didn't get Freon in your charge. So if you paid for Freon which is super expensive you got ripped off. It takes r134. And just cause you. Charged the system did you have the system tested. If not tested by a good hvac shop you may have clogged filters or other issues including your bad controls. Also it may have leaked out again if there is a leak

1999 Chevrolet... | Answered on Feb 07, 2018

just pull the cluster remove the bulb and put in new one

1999 Chevrolet... | Answered on Feb 02, 2018

If you have an autozone in your area, take it there. Ask them to plug in the obd unit and diagnose your issue. They can give you a printout of what the issue the obd is seeing, can sell you parts, and even show you how to replace whatever.

Semper Fi,

1999 Chevrolet... | Answered on Feb 02, 2018

Google door panel removal tools and you will see items that look like small crowbars. They slide between the panel and the metal and pry the fastener out of the metal. You can also watch videos on the process on you tube.

1999 Chevrolet... | Answered on Jan 19, 2018

try the temp sensor by the thermostat housing,make sure its not broken when you unplug it,ohm sensor itself when warmed up,and when cold

1999 Chevrolet... | Answered on Jan 13, 2018

Timing chain may have skipped a tooth or maybe fuel pump has failed.

1999 Chevrolet... | Answered on Jan 10, 2018

I take it you have no clue about automotive electrical testing ? Voltage drop testing electrical circuit's ? Do you know how to use a DVOM - digital volt ohm meter , how to read an use wiring diagrams ? Electrical distribution diagrams . Sounds like a loose connection , bad ground etc.... Electrical testing is the key to finding the problem . Not going on some web site an saying what the heck . Think someone's going to have a magical fix . Doesn't happen with automotive electrical problems . It takes years of training to learn electrical diagnostic's
Voltage Drop Test
Voltage Drop Testing the Charging System
Electric Testing Techniques You Need to Know


1999 Chevrolet... | Answered on Jan 05, 2018

Not finding what you are looking for?
1999 Chevrolet Silverado 1500 Logo

6,276 questions posted

Ask a Question

Usually answered in minutes!

Top Chevrolet Experts


Level 3 Expert

83096 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22382 Answers

Ronny Bennett Sr.
Ronny Bennett Sr.

Level 3 Expert

6927 Answers

Are you a Chevrolet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

View Most Popular

Silverado 1500 Chevrolet

  • Silverado 1500 Chevrolet

Most Popular Question

1999 chevrolet silverado 1500 z71

  • Cars & Trucks