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Sonoma

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Question
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....
Question
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...
Question
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...
Question
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...
Question
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...
Question
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....
Question
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...
Question
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...
Question
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...
Question
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...
Question
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...
Question
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...
Question
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...
Question
Suspension is "loose"
The term "suspension is loose" is most likely the mechanics way of saying that you have worn components in the front end that would cause the alignment to not be able to be set to specifications. He might of seen...
Question
My coolant ran out when the vehicle sat for 2 years and I am scared to start it.
Hi there. Look in the engine compartment and locate the item that cracked to cause the coolant to leak out. If the radiator cracked, then replace the radiator, fill up the cooling system with water, and look for leaks. If...
Question
What else can be done
You should have an engine compression test done to see if one or more cylinders are low on compression. If the spark plug insert is not installed correctly or leaking compression it will be identified in this test. If the...
Question
The steering shaft (I believe it's the intermediate shaft) disengaged from the steering column.
Freely turning the steering wheel past the normal extent (travel limits), while the shaft is disconnected from the splined yoke will damage the "clock spring" in the steering column that the air bag relies on to fire. That assembly should...
Question
Truck spun and hit the curb, now the rear wheel wobbles
Hey there. You will need to have the rear rim inspected along with the rear axle to see if one or both are bent. I have also seen where the rear axle housing gets bent if the curb was hit...
Question
Check engine light / truck stalled on me today and wouldnt start
As you may know the oxygen sensors which are part of your emissions system read exhaust gases to determine whether or not the appropriate amount of oxygen is present in the exhaust. Based upon this reading, this information is relayed...
Question
Cylinder 1 misfire
Hi there. From the description you have provided, two things come to mind. One, a blown head gasket between cylinders #1 and #3. Two, an intake valve not sealing ie; broken valve spring, burnt valve. Providing spark to the number...

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