SOURCE: why wont my 2001 gmc sierra 2500hd go into 4th gear?
There is a speed/shift sensor you could change, but if you haven't changed the fuel filter in a while, i'd go there first. Sometimes, in fact, often, plugged fuel filters can cause the engine to starve for fuel, and make it seem like the transmission is the problem.
SOURCE: why wont my 2001 gmc sierra 2500hd go into 4th gear?
Check to make sure you don't have the TOW/HAUL switch on the end of the tranny stalk turned on
SOURCE: My 99 gmc sierra 2500hd has a bad o2 sensor sensor
bank 1 always refers to the bank that the No.1 cylinder is located and bank 2 is the other bank. Senspr 1 refers to the upstream oxygen sensor ( before the catalytic converter) sensor 2 refers to the downstream o2 sensor(after the cat) So if your No.1 cylinder is on the left side(drivers side) then your assumption is correct.
SOURCE: Where are the two knock sensors located on a 2002
Hello: There are two knock sensors under the intake manifold on top of the engine. Replace them both.
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