Top 20 2002 Chevrolet TrailBlazer - Page 9 Questions & Answers

run the fault codes and look for faulty TCM module or servo/ solenoid faults for those gears

You need an interface module so it will work with the vehicle ! The radio is hooked up to the class 2 serial data bus , if you don't hook it up right the vehicle will not start an run !

If by "anti lock" you mean "pass lock" which is the GM passive anti theft system then you can try this... put the key in the ignition, turn the key all the way to on (not to the point of trying to start it just to the ON position) 3 times , on off, on off, on off, on at this point leave the key in the on position for 15 minutes, after the 15 minutes turn the key back off and try to start it. there are two varations of this reset method that I'm aware of... the other variation is similar to a point. key in, on off, on off, on off, on leave on for 15 minutes then turn the key to start without turning to off first.... if the first method doesn't work, try the second. I believe there is another method that involves the key fob remote if your car has one. I will try to see if I can find those instructions just in case the first two methods arent of any help..

There is a possibility that the auto year box fluid may be past its best but you would notice issues in other gears. It could also be wear in the paper gaskets in the auto clutch. It is unlikely that it is a total gear box issue but nevertheless you will need expert opinion, my first port if call would be AAA if you have it then a dealership.

Thats not a real code. Take it to a auto parts store and have them check for any codes.

check for spark and fuel pressure.

THE IGNITION KEY MUST BE PROGRAMMED TO THE COMPUTER IN THE CAR. ALSO THE PAS SYSTEM IS CONTROLLED BY THE IGNITION SWITCH.

This is a tricky code PO252 refers to the fuel injection pump metering control A range performance. Their just isn't enough information for me to ever speculate other then its a 2002 try changeing the fuel filters and take a look at the pump out put pressure it should be over 60 PSI at least if its lower it could be the fuel pump

Iwould be careful what I replaced this seams to be a big problem with these vechicles at least a dozon codes all related and thats not counting the 02 sensor codes 20 more all realated

under dash above brake pedel the charm box the relay is be side it

you might have blown a fuse chech fuse box under hood.

Usually, it's a door motor on the heater case that's stuck/broken. Is this an automatic HVAC system or a manual system?

clean maf intake sensor with maf cleaner spray, do not use carb cleaner it will damage it its on intake snorkel hose.

Get codes read by someone with GOOD scan tool that will pull ABS codes (many won't do this).

May be broken 4WD actuator (quite common) which has stuck between engaged and disengaged. Remove and inspect actuator, but first examine all linkage for damage or having come loose.

check the clearance of the brake pedal rod into the master cylinder. Should be about 1" movement before the rod moves the piston . The master cylinder has a blockage in the compensating ports so replace the master cylinder. As the brake oil is heating from brake application, it is not getting back to the reservoir so it is pressing the pads back onto the rotors which is heating the oil even more.

we had this same problem n a Sonoma pu.we had to hook up a manual control on the cable that goes to the actuator,it was a simple bolt and nut system that u pull out and tighten with the nut ,it works and your inside controls still disingage the transfer case.

I don't recommend you do this job, Francisco. I know it costs to have a garage to do it, but it will be worth it in the long run. The parts you pull off the oil pan can cost up to $1000 at a junkyard, just for one of them. They break because of corrosion.

Personally I'd just pull the engine. Easier. Try jacking it up see if there is enough room..