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2005 Chevrolet Trailblazer Questions

Get answers to questions about your 2005 Chevrolet Trailblazer at RepairPal. Find solutions, diagnose problems and get back on the road.

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I have an engine error code P0410. The air pump does not come on when engine is started. The 60 amp fuse in the engine fuse box was blown. The pump and hoses were filled with water. I replaced the fuse and the check valve on the manifold. I figured this was faulty which caused the water in the hoses and pump. I removed the plug from the pump and checked for 12 volts after the engine was started. No voltage was present. I removed the relay from the pump and disconnected the plug. I measured 12 volts across the coil. Figured the relay was bad and replaced it. Still no 12 volts at the pump connector. Could use any help from here.

I replaced the coolant temp sensor. I am still getting a PO128 code. I tested the sensor and it tests good. The gauge reads 200. What else could be causing the code?

I've changed the coolant temp sensor 3 times. What else could be the problem?

We have a 2005 Chevy Trailblazer that has recently been having an intermittent starting issue. We have replaced the battery, ignition switch, starter relay and had the starter tested - it's good. So we are not sure what to do. The car may start for several days and then you go to start it and all the lights come on and the accessories work, but it won't start. After lots of tries it may start and it may not. We would appreciate any help and advice.

Thank you!!!

When Heat turned on in floor or defrost mode, loud knocking from under center of dash. Vent mode is quiet. When I press the re-circ button, it flashes for a second or two, but never turns on... Would this be an accuator? what would I be looking at to fix or have fixed? THANKS!!!

the tube for the air filter box came loose and got wedged to where it was being chewed up by the fan.

No air flow from front vents plenty of air flow in rear vents.Thanks Jeff

CLICKING SOUND AND DOES NOT WORK WITH THE REMOTE AND THE KEY LESS ENTERY DOES NOT WORK.

For a short time, I was only getting air blowing with levels 1-4 (out of 5), then they stopped working altogether, then 1-3 started working again for about 2 days, now they don't work at all. Its wintertime and can't get defrost to operate until I'm driving on the highway and the warm air works its way through the vents when the engine warms up (often this is much too late for safe driving), and no fans, so no heat at low speeds. From what I've read, it may be the blower resistor AND the blower motor? Does the repair manual talk about/show how to replace and/or repair these items? I'm on a serious budget and have gone without heat now for about as long as I can stand it, but cannot find the repair manual at my library for the 2005 model - does anyone know if the 2003 model is the same for these items? Don't want to mess with that if I'd need to take it to a local shop anyways. Thanks in advance for any advice offered here!

I have to turn engine off for few seconds and then turn it back on.
I have no power when I hit the gas and it does it frequently.

The owners manual shows a cooling fan relay (45) in the fuse/ relay box under the hood. The same type , & part # relay operates the headlights high / low headlights circuit (relay #46).

I had one replaced post cat 02 sensor. But Im told there are 4 sensors, 2 in front & 2 in back. Now someone tells me its my air induction valve..which can cause rough idle and poor gas milege. Im confused what the heck is it?

vibration at low rpm when at a stop. vibration increases when ac is on.

I'm getting a P0128 CODE on my Trailblazer. It is caused by a defective temperature sensor or thermostat. Where are these items located?

a whining noise comes from under the hood when the key is turned to acc. sounds to me like it is coming from the throttle body assembly