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Sierra 2500 HD

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Question
Bad idling after coolant temp sensor replacement
If you have a bad knock sensor, then the engine timing may be going too low and causing the low rough idle. If the scanner gives a code, then have it diagnosed and fixed. A vacuum leak will also cause...
Question
Water damage to electrical components after a flood. Is there anyway for the electrical to be tested?
Many times when a vehicle has been involved in a flood, it is typically considered to be totaled. There are so many electrical systems in newer automobiles that it would be very tough to test everything for water damage. I...
Question
I came from work and thermostat was how it should be then I got home and turn the engine off but had the ignation on been off and
Hi there, thanks for writing in. It sounds like your concern is the leaking antifreeze with the ignition on, engine off. Leaking coolant is never a normal condition on any car, even if it's remotely modern. Anytime there is leaking...
Question
Truck stalls sporadically
Hello there. Thanks for writing in about your 2001 GMC Sierra 2500 HD. When faults occur after a repair has been made, the newly repaired item is usually the first place to check. A few possible causes for the stalling...
Question
Bad gas mileage
Hello there. A decrease in fuel milage can be attributed to a few different faults. The most common causes are leaking fuel injectors, oxygen sensors, coolant temperature sensors, vacuum leaks or exhaust leaks. A qualified technician, such as one from...
Question
Ocassional shifting problems
Hello there, a few different faults could cause the vehicle to shift poorly. The most common would be low transmission fluid level, a shift solenoid, transmission linkage damaged, or a transmission range sensor. Always the first thing checked in any...
Question
ABS light on, brake light on
A few different faults may be causing the ABS and brake lights to intermittently show on your 2001 GMC Sierra 2500. You are correct that the ABS brake control module could be a potential cause. The most likely causes would...
Question
How to change blower resistor
Remove the sound insulation panel located under the right side of the dash, by passenger's footing area. Disconnect connector to blower resistor next to blower motor and remove the two screws. From there you'll be able to remove resistor from...
Question
Fuel filter loses its prime and the Check Engine Light is on - code P0907
It sounds like you may have an issue with your fuel pressure regulator. If the fuel pressure regulator is malfunctioning, this can cause a loss of fuel pressure. If fuel pressure is lost or drops below the manufacturer's specifications, the...
Question
Why does my vehicle go into reduce engine power mode. 2008 Chevrolet Silverado
Hello. I would need to know what code you are getting to know what needs to be done to take care of this. If you are getting a MAF code then the sensor may be failing, but that will not...
Question
P0483, with engine overheating.
Hello. P0483 is the trouble code a "Cooling Fan Rationality Check Malfunction. If the computer detects a discrepancy between the cooling fan's commanded state of operation, versus the actual state of the circuit, it will set off this code to...
Question
Where is the cmp located
The camshaft sensor is mounted straight down into the top rear center of engine block behind the intake manifold. The sensor is held in by one bolt and is pulled straight up out of the block.
Question
duramax running crappy in cold weather
Hi there. In most cases, when an aftermarket tuner is utilized, traditional OEM diagnosis of problems is extremely difficult; since they impact both electrical and mechanical fuel, and ignition systems. Your best bet is to have a professional mobile mechanic...
Question
Reduced Engine Power Light is on - 2006 GMC Sierra 2500 HD
Hello. Reduced engine power is commonly caused by fuel flow restriction issues or fuel/air mixture problems. Some of the components that could be dirty or faulty include the fuel injectors, the throttle body, or the EGR system. The best...
Question
Car runs fine when idling but while driving it sometimes shuts off and I have to wait a few minutes to fire it up again.
Hi there. When the engine stalls out, the power steering and the power brakes will stop working for they need the engine to operate to make them work properly. For the stalling issue, check all of the sensors on the...
Question
How do I fix my fuel gage in my truck?
This is a problem likely related to your fuel tank sending unit.This is a small float type component inside your fuel tank that measures the level of the fuel inside the tank. As the fuel level drops, the float level...
Question
Broken crankshaft position sensor
It depends on where the sensor broke as to whether it can still be removed. In most cases, a professional mechanic would remove multiple components that would make it easier to access. Once it's clear, you can usually use a...
Question
How much will it cost to have a mechanic fix it?
Billing question was sent to CS for the cost of replacing the crankshaft position sensor on a 2001 GM Sierra 2500 HD with a V8-8.1 engine.
Question
2006 GMC 2500 HD P0101 Mass ari flow sensor (MAF) performance
The powertrain control module (PCM) sends the mass air flow (MAF) sensor a 12-volt reference signal. Incoming air flows over a wire inside the MAF, which allows it to measure intake air temperature, and therefore air density. The MAF then...
Question
Only seem to have 4 Low forward and reverse and reverse 4 HI only.
The transfer case may have damaged the shifter rail or the synchronizer on the shifter rail. I recommend seeking out a professional, such as one from Your Mechanic, to help you diagnose your transfer case.

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