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2007 Chevrolet Trailblazer 4.2 Questions & Answers
Where is the transmission speed sensor located on a 2007 4x4 trailblazer, will it cause the transmission not to shift into 3rd gear?
No it would not ! you probably have a 2-3 Shift Solenoid (SS) problem !
You trailblazer has Vehicle Speed Sensor (VSS) located on the tail shaft of the trans . this sensor supply's info to the PCM for vehicle speed . Your trailblazer also has a Input Speed Sensor (ISS) if this were bad it would cause erratic shifts all gears ! Does your vehicle have a check engine light lit or any other type light like a yellow wrench or service vehicle soon ? Your best bet is to take it to AAMCO or some other ASE certified repair facility !
P1400
Problems with the intake manifold, a vacuum leak in the exhaust and proper gas recirculation can produce these codes. p1400 codes,
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you need a tune up, plugs, wires, fuel filter, air filter, pcv valvve,etc..
2007trailblazer-humming noise when push on gas
Is the check engine light on as well?Its possible that the fan clutch is bad and the noise your hearing is the fan rotating at higher speed than necessary. Try removing the serpentine belt and then see if the noise goes away. Do not run it without the belt for more than 5 minutes as the water pump will be disabled and will not cool the engine. I’m happy to assist further over the phone at
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