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Sierra 1500

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Question
Fuel Gage
Hi there. This is a problem likely related to your fuel tank sending unit. The fuel tank sending unit is a small float type component (or sensor) inside your fuel tank that measures the level of the fuel inside the...
Question
Automatic Light switch refuses to dim lights although I replaced it with new unit
Ken: If by "dim" you mean "turn off", there is a light sensor in the circuit which, if malfunctioning, would cause the problem you are describing. If the light sensor is not the issue, obviously the circuit is powered when...
Question
Can I put a natural gas motor into a normal truck?
Hi there. CNG powered engines would require multiple system upgrades and changes ranging from the fuel cell, fuel line plumbing and electrical system upgrades. It would probably be more work that beneficial to attempt this type of swap.
Question
Car wont start even with jumper cables
It sounds like your battery is completly dead. This could have happened either because the battery is old and failed or because the alternator is not sufficiently charging the battery. This issue can be resolved in two different ways depending...
Question
Took engine from 4wd 1998 jimmy put in 2wd 05 sierra. Problem is transmission not engaging. What do i need to do?
Make sure the fluid level is OK. Check the shift lever and be sure it is actually moving the manual valve to the commanded position (Drive for example). To determine if the converter is functioning and/or if you have a...
Question
2003 gmc sierra stalling
Hi there. Once running, the engine requires a constant flow of gasoline and good spark to keep that fuel igniting. If gasoline is not readily available, or if there is not enough spark, the engine will quit. More modern vehicles...
Question
If my ecm pcm touches the frame and it sparks does it cause the computer to mess up.
Hi there. What you are describing is an indication of a serious electrical glitch within the ECM or PCM. The best way to determine this is to either have a professional mobile mechanic come to your location and attempt to...
Question
My truck is pulling left during hard braking and pulling hard right when accelerating or getting jostled. 2012 GMC Sierra
Hi there - I would get a 2nd opinion on the front suspension. Something, hard to say what without direct inspection, is shifting under load: a control arm bushing, suspension link, or tie rod end. I recommend a steering and...
Question
Both fans stay running after truck is off and key is remove until battery is dead. Checked relay they are good.
Hi there. If the cooling fans are staying on at all times, this is another (less common) symptom of a possible problem with the cooling fan relay. If the relay shorts internally, it may cause power to be permanently switched...
Question
Overflow tube in the front differential is leaking oil constantly on a 2014 GMC Sierra 1500.
Disconnect the vent tube on the differential and blow through the tube on the differential. If you are unable to blow through it, then the differential is creating too much pressure and pushing out the oil through the tube. I...
Question
Reduced engine power message is on the dash.
The reduced power light is on for either the catalytic converter is overheating or the transmission is malfunctioning. If the vehicle is able to shift through all of the gears, then check the engine to see if there is a...
Question
Shifting into 2nd at high RPM
Hi there. It is very possible that the speed sensor or shift solenoid is the primary source of this type of issue with the first to second shift. However, a worn out torque converter or an obstruction inside the transmission...
Question
Lost all transmission fluid near radiator overnight 2004 GMC Sierra
Hello - there are fittings at the radiator where the transmission oil lines go into the radiator side tank. Perhaps one or both of these fittings came loose, or broke - leaking fluid from that point? Gravity would do the...
Question
Engine light on with P0171 code
The cause behind diagnostic trouble code P0171 is easiest to find by looking at the secondary firing patterns on the Bank one cylinders. That will confirm if the too lean condition, that has caused the code to set, affects all...
Question
Wheel is free but the key won't turn
You should try a different key if you have a spare one to try. If the spare key turns the ignition now then the original key is worn and needs replaced.If you do not have an extra key then look...
Question
Reduced engine power light
Hi There, The reduced engine power light may come on for many different reasons when the transmission or the engine encounters a serious problem. The reduced engine power mode is a safety feature to ensure that additional damage is not...
Question
I need to now if my 2001 GMC Sierra 1550 4WD had a 3 or 4 spline pitman arm.
Hi there. To see if the pitman arm has 3 or 4 splines, check the splines on it with the nut off. Use a flashlight and look at the splines to see if there are 3 large flat areas or...
Question
My truck has hard start issues in the morning and afternoon. I live in Florida.
There are many causes of hard starting and the reality is all of the causes have to be considered sequentially and patiently. Some illustrative causes include a faulty engine coolant temperature switch (sensor), malfunctioning idle air control (IAC) valve, vacuum...

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