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Sierra 2500 HD

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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...
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...
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...
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...
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...
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...
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...
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...
My car seems like it's flooding when you start it even though it's fuel injected? Why would this be?
Hi there, thanks for writing in. The amount of fuel injected into your engine is controlled by the PCM, with several inputs from various sensors on the engine. One of the most important inputs is the coolant temperature sensor, and...
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...

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