Question about Chevrolet TrailBlazer

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Hi i have a 04 trailblazer and the check engine light go on, i take t autozone, they sid the crank or cam sensor it's the problem. my question is where is located and i want to know if i can do this by my self.?

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The crank sensor is near the harmonic balancer or the lowest pulley on the motor. Should be fairly easy to change. Camshaft sensor should be at the rear of the engine on top. Also relatively easy to change.

Posted on Apr 23, 2009

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It should be cam sensor the car would not run if it was the crank sensor

Posted on Oct 12, 2012

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Hello... so I've had my battery changed and new camshaft sensor actuator and 2004 chevy trailblazer is shutting off and reading cylinder 1 misfire


engine misfires can be from ---low fuel pressure--- faulty injectors---faulty injector wires---HT leads touching each other--Leads ---plugs--- air /fuel mixture wrong from leaks in manifold and dash controls hoses--wiring to the cam/crank sensors loose /dirty connections.

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2003 trailblazer service engine soon light .code po301 number 1 cylinder misfire,code po014 cam phase eeror


you may need to replace the cam and crank sensor at the same time.some vehicles use these two together to communicate with the computer.

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Hey Doug. I would change the cam sensor and see it that takes your light on. The misfire may errase with a new cam sensor. I would hold off on the crank, until I changed the cam sensor. If it still runs rough, then maybe try the crank sensor. It is possible they didn't gap the #8 plug right or it was a bad plug. I would try the cam Doug. I would hold off on the crank.

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'04 Sorento, 110,000 mi., shudders faintly when accelerating from a stop. If I take off slowly, no shudder. I drive with 'Snow' on and less shudder. Also, probably unrelated, about 1 month ago I turn...


could be a falling cam sensor or O2 sensor, O2 sensors don't like being cold as it takes longer to heat up and ecu reads it as a fault. cam sensor these fail more when they get hot. dirty MAF/MAP sensor can also affect the engine.

Jul 15, 2017 | 2004 Kia Sorento

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Check engine light came on, computer scan indicated the cam shaft sensor was bad, changed the cam shaft sensor 3 times and the engine is still studdering and trying to stall. now the computer scan is...


cam sensor it also linked to the crank sensor usually if the cam sensor fails around the same time the crank can become un synced with the replacement. or the new sensor is not the correct one, ie sensor from a 1998 model will sometimes work on a 2005 model if it has the same ecu fitted in the 2005 not the hole ecu but the chip. on the cam sensor there is say in some cases 3 poles positive feed negative and then signal. on all the poles there is a resistance between poles that the ecu reeds. it reads the voltage being used and the signal its receiving if one of these is wrong but it detects one of the readings being right it will think the other sensor is wrong. and thats a mis match. the resistance changes over time.

Jun 21, 2017 | 2005 Chevrolet TrailBlazer

1 Answer

Check engine light comes on 4.2 liter vortec engine 2002 trailblazer thinking it could be the crank sensor because car will have another warning that says power down and will only let me go 10 miles per...


yea your truck is going into limp home mode. this happens when a major sensor like a crank or cam sensor goes bad. you'll definitely want to get it checked out with a scanner to see what the code is. the boys at your local autozone or advance auto parts stores will be able to help you out with a scanner for free. and go from there.

Jan 26, 2010 | 2002 Chevrolet TrailBlazer

1 Answer

Crank shaft sensor? is this the same as cam shaft


no each one has its own job,
crank sensor is counting crank shaft rpms
cam sensor is counting cam shaft rpms
is there any lights coming on just as this is happening?
i think you should have the fuel pressure checked when it dies out,you need at least 50psi at fuel rail

Dec 08, 2009 | 2002 Chevrolet TrailBlazer

1 Answer

Engine keeps missing. unknown codes


Code 1682 indicates low battery voltage. This could be a problematic alternator, which would likely cause misfiring. Autozone should be able to check this for you for free.

Code 1391 indicates the computer can not see the crank or cam sensor signal. This would likely be a result of the misfires.

Code 0320 indicates the crankshaft position sensor reference signal could not be found while the engine is cranking.

All of these issues point to either a cam/crank sensor malfunction or a charging system problem, either or both of which could cause the misfiring.

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