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Sierra 2500

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Prior to performing diagnostics be sure you have a fully, 100% charged battery that passes a load test (https://www.yourmechanic.com/services/battery-is-dead-inspection). Confirm that the engine immobilizer system (security system) is not activated thus preventing the car from starting. If the immobilizer system...

2002 duramax went into limp mode after fluid ad filter change

Hello, I can help you with this! When doing a transmission service for this vehicle, you will set a (DTC) trouble code for a low pressure condition with transmission. This is a normal condition when replacing the filter and...

AC blower motor quit, ABS and brake lights on - 2003 GMC Sierra 2500

A common issue on the Sierra is a failure of the blower motor resistor (https://www.yourmechanic.com/services/cooling-fan-resistor-replacement). This should be checked and replaced if faulty. The ABS Light being on indicates a fault in the ABS system, wheel speed sensors (https://www.yourmechanic.com/services/wheel-speed-sensor-replacement) and...

Vehicle lost gears, can shift only in 4 low

Hello. This sounds more like an electronic transmission control issue. GM has a TSB out for a low voltage condition at the solenoid pack. To see if this is the issue, fault codes should be read out and and then...

the flywheel bolts broke how hard and what will cost to get fixed ballpark figure

When a bolt breaks off inside the bolt hole, getting it out usually requires drilling. If the transmission is inside the vehicle still and there is not enough room for a drill, the transmission will require removal in order to...

Won't shift out of second gear - 2000 GMC Sierra 2500

Hello. This definitely sounds like an electronic transmission control issue. It could be something as simple as a transmission range selection switch (https://www.yourmechanic.com/services/transmission-position-sensor-switch-replacement) or something as serious as a transmission valve body. You may want to consult with a transmission...

Knocking sound and steering column vibration - 2005 GMC Sierra 2500

Without hearing or experiencing the noise myself, it is hard to make an accurately diagnose this but GM has a TSB (technical service bulletin) (https://www.yourmechanic.com/article/how-to-use-a-technical-service-bulletin-tsb-to-diagnose-and-repair-a-car-by-valerie-johnston) that may address this concern. There are 3 possible causes from a body mount at...