20 Most Recent 2004 Chevrolet TrailBlazer - Page 3 Questions & Answers


Hello Linda! Replacing the HDM relay for the low beams will not trigger any of these problems. If the blower isn't working, you probably need to get a new blower motor resistor (for manual controls) or blower motor module (looks the same) for automatic climate control. To access, need to remove the plastic kick panel near your feet on passenger side. After removed, look up you'll see the resistor, it's about 4" long with 2 small screws in it. You'll also need to drop the glovebox door to remove the connector from the resistor to the motor. Suggestion- buy a pig tail for the resistor also, these tend to melt. Very common problem. The ABS dash could be a bad wheel hub assembly or a hub starting to go bad.

2004 Chevrolet... | Answered on Jan 25, 2018


Front fuse box


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Rear fuse box


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2004 Chevrolet... | Answered on Jan 19, 2018


Your door lock mechanism is wire not rods. That's why door won't open. Need to get power somehow. Look under car and see of you can reach up to the hood latch and release mechanism to open hood. If so open hood and hook up a jumper pack. This should allow you to unlock door.

2004 Chevrolet... | Answered on Jan 16, 2018


For engine to run it has to have:
Fuel, air and spark.
So if it doesn't start, something's missing.
Is your fuel pressure OK? Is your spark present? Is ECM firing injectors?
Check all those basics and I'm sure you'll find what's wrong.

2004 Chevrolet... | Answered on Jan 10, 2018


check if the speed sensor melted again. Then you have a problem of figuring out where the short is.
You'll need a mechanic to help with that cuz the variables are a lot.
but double ck the wiring going into the speed sensor for fraying/broken wires., look in the connector to see if there is any gunk.
hope this helps a little.

2004 Chevrolet... | Answered on Jan 09, 2018


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Carnac the Magnificent

2004 Chevrolet... | Answered on Jan 08, 2018


Hard to say - not being very careful when replacing the battery can generate voltage spikes that can damage electronic equipment in the vehicle, or put certain processors in a locked up state. You can try disconnecting the negative battery cable for a few minutes and then reconnect it to see if the various systems reset themselves. If the problem persists, your HVAC control module may be damaged.
As far as the rear air is concerned, you first should check the wiring and connector on the switch - may not have been connected properly, the switch may have been damaged or a wire may have been cut.

2004 Chevrolet... | Answered on Jan 06, 2018


On the right side of the engine boss right ahead of the cylinder head if I remember correctly its under the alternator or what ever accessory is in the upper front corner of the engine. Passenger side/Right side. Hope this helps. Thats for the serial number, block cating number is on the block boss back where the oil pump drive is, right where the transmission bolts to the cylinder block at the top.

2004 Chevrolet... | Answered on Jan 03, 2018


Certainly sounds like the ac compressor is stalling the vehicle. This usually occurs when the high pressure switch in the system is faulty, and not deactivating the clutch temporarily when it senses a high pressure in the system. An intermittent failure in the switch is not uncommon - try having it replaced.

2004 Chevrolet... | Answered on Dec 26, 2017


Weak battery or bad connection

2004 Chevrolet... | Answered on Dec 19, 2017


I agree with Enrique.
Just to add, Maybe you can take shift linkage loose and move tranny lever by hand, see if you can get it into park position? There are safety issues trying to do that, You don't want the vehicle to move. Safety is your responsibility. If the vehicle is on an incline, you may need to nudge it a little, so the tranny isn't holding the vehicle.
Can you check for applicable tranny codes, if there are any?
Just because the dash lites come on, doesn't mean the battery has a full charge. Just my opinion.

2004 Chevrolet... | Answered on Nov 20, 2017


Water is certainly getting into something electrical that should be sealed (maybe because of a windshield leak). You will have to find out where the water is getting in - under the dash, or if there is a loose electrical connector or the fuse cover is loose under the hood.

2004 Chevrolet... | Answered on Nov 02, 2017


I should guess it to be the electric fuel pump, although I thought those sounds had been eliminated by the manufacturers long ago. Perhaps you could raise the car in the air and get underneath it and see ( or I should say "hear")
That sound from the fuel pump should not mean it is bad or is going bad.
God bless your efforts.

2004 Chevrolet... | Answered on Oct 17, 2017


Possibly a defective ABS sensor, or low brake fluid. Recommend a reputable mechanic to assess the issue.

2004 Chevrolet... | Answered on Oct 12, 2017


Are you on an incline? If so try rocking your vehicle forward and backward with others helping you. Your transmission may be bound. While the vehicle is rocking you should be able to shift the transmission into neutral.

2004 Chevrolet... | Answered on Sep 10, 2017


Get the trouble codes read. Otherwise you're totally in the dark about which wheel is causing the problem

2004 Chevrolet... | Answered on Sep 07, 2017


There are internal valve timing parts that are not operating correctly. Take it to a dealer to find out whether your warranty will cover the repairs.

2004 Chevrolet... | Answered on Sep 07, 2017


All those codes and such an easy fix. ALL of these codes point to your upstream 02 sensor. It's the one on the passenger side of the engine coming off the exhaust, very very easy to get to. Soak that puppy with PB Blaster then remove the electrical connector and remove and replace sensor. TRY to stay away from Bosch 02 sensors, have been known and reported problems with these. In my case, I didn't have a choice but to buy the Bosch, but I haven't had any problems with mine.

Hope this helps, look to get a tad more miles per gallon too.

2004 Chevrolet... | Answered on Aug 29, 2017


the po740 is a torque converter, clutch malfunction alarm
the po753 the PCM has detected an electrical problem in the shift solenoid (usually faulty shift solenoid.
the p1860 TCC, PWM solenoid electrical circuit
If it was my Blazer buy new solenoids and replace them.

2004 Chevrolet... | Answered on Aug 19, 2017

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