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Sierra 2500 HD

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limp mode

This problem may be a wire connection or TCM or PCM issue. The first thing that has to be done is to get communication with the TCM. The different computers communicate all to the engine computer and then to the...

Truck will not start or crank with the key bit all lights are on, 2008 6.6L gmc 2500

It sounds like what you are describing may be related to a faulty starter relay or some faulty wiring that may not be producing a proper connection to the starter. The starter relay (https://www.yourmechanic.com/services/starter-relay-replacement) directs power from the battery to...

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...

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...

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...

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 (https://www.yourmechanic.com/services/transmission-fluid-service), a shift solenoid (https://www.yourmechanic.com/services/downshift-solenoid-replacement), transmission linkage damaged, or a transmission range sensor (https://www.yourmechanic.com/services/transmission-position-sensor-switch-replacement). Always the first thing...

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 (https://www.yourmechanic.com/services/fuel-injector-replacement), oxygen sensors (https://www.yourmechanic.com/services/oxygen-sensor-replacement), coolant temperature sensors (https://www.yourmechanic.com/services/coolant-temperature-switch-sensor-replacement), vacuum leaks or exhaust leaks. A qualified technician, such...

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...

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...

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 (https://www.yourmechanic.com/article/how-to-clean-a-throttle-body-by-timothy-charlet), or the EGR system. The best...

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...

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...

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