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Creaks/groans when hard cornering.
Hello, thanks for writing in about your GMC Sonoma. You need to have the entire front end checked for wear. You may have worn sway bar links and bushings, upper and lower control arm bushings, and ball joints are worn....
Small electrical problems with my lights.
Usually a bulb that works intermittently has a shorted filament. In this case, the bulb just needs to be replaced. However, if you have already replaced the bulb, my guess is that the socket is corroded or damaged. A new...
Occasional shaking and sluggishness while accelerating
If your vehicle is shaking and losing power, the most likely cause is fuel or ignition system related. I would recommend having the fuel pressure checked by a qualified professional to determine whether or not the fuel pressure is within...
Bank one and two in rich conditions, CEL on
If the mass air flow sensor has failed, unfortunately cleaning will not resolve the issue. I would recommend having your mass air flow sensor tested with a digital multimeter or scan tool using the manufacturer's suggested procedure to determine if...
Difficulty shifting into first gear
It is possible that the clutch itself may have been worn down to the point where it can no longer engage the correct gear. Clutches are made of the same material as brake pads and can wear down over time....
Rear right wheel issue
It is possible that your back tire could be rubbing against something. I would have the rear axle of your vehicle inspected by a certified mechanic and make sure that nothing is bent or obstructing the wheel and tire in...
The truck has problems with lights
You may have a shorted wire between your reverse lights and your brake lights. This is a common issue due to the fact that the wires for these two lights are often wrapped together as one wiring harness. If your...
switching into 4hi from 2hi by itself
Your vehicle uses an electric transfer case motor to switch from 2WD to 4WD, and that motor or the associated wiring may be failing and switching itself over bumps. I would begin by checking the wiring and connectors to the...
Truck not passing emissions test
For a vehicle that is over twenty years old, a full tuneup could mean a lot of maintenance, from plug, wires, filters and injectors, to major components, in order to fix the emission failure. These engines have a problem with...
a/c problems
You may have a cooling fan clutch that is not working properly. The fan might not be turning as fast as it should. When the A/C is on the temperature rises in the condenser and transfers the heat to the...
What sensor affects bank 2?
Code PO302 refers to a misfire. P1153 refers to the O2 sensor not switching often enough. This sensor monitors how often a lean to rich condition or rich to lean condition is present. When there is inconsistency in this, the...
No spark to ignition
Lack of spark to the ignition system on your GMC Sonoma can be caused by a variety of components. These possibilities range from the ignition control module failing or not receiving proper battery voltage, to a faulty ignition switch and...
Key stuck in ignition
Hello there, a key getting stuck in your ignition is a common fault with your 2002 GMC Sonoma. The most common cause would be a worn key, faulty key cylinder, ignition switch, steering wheel lock, or a wiring harness fault....
Battery drain
The smartglow fuses you are referencing won't directly place a noticeable drain on the battery themselves, but if they are blowing repeatedly then there is an electrical short somewhere that could be causing a battery drain on another system. If...
Truck jerks and hesitates on acceleration
This may be a sign of a failing mass air flow sensor. The mass air flow sensor is a unit in the intake system that monitors air intake as it is mixed with fuel prior to being injected into the...
Can you help me figure out why my ABS and brake lights come on at the same time?
Hi, thanks for writing in. In order to know what is causing the lights to come on, you would need to have the ABS module scanned to see what codes are stored. You could be low on brake fluid or...
What would make all three plugs on bank to foul out?
From what you've described, you'll need to have the fuel pressure tested to make sure it holds after tuning the key off. If the pressure drops then you may have a leaking fuel pressure regulator. If pressure is okay then...
My truck struggles to start and stay running
This sounds like a fuel pump that is weak to start the vehicle and then stops pumping after ten minutes when it heats up. Have the fuel pressure checked to see if it is holding pressure and keeps pressure when...
Clutch problems
Hello and thank you for your question. With the clutch staying in neutral all the time, go under the vehicle and check the slave cylinder return spring. See if the return spring is broken or has fallen off. If the...
Plugged heater core
Hey there. The heater core may burst if you use too much pressure to try and purge the core of blockage. The core gets blocked from using the wrong fluid in the vehicle. The coolant will get all brown and...

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