What fixes codes p1515 2004 envoy? - 2003 GMC Yukon Denali

Do you have a code number? otherwise more commonly found when you have just reverse is a cracked cage in the transmission,the good thing is it is a cheap fix.

all trouble codes are 5 digits starting with a letter

Reset airbag light ????? Light on ,problem with the system , DTC'S - diagnostic trouble codes set in air bag control module . Have the codes diagnosed ,fix the problem an the light will reset it's self . Your best bet ,take your vehicle to a qualified repair shop.

First have scanned for codes could be something wrong. Then fix the problem and use the code scanner to reset light

no trick need to fix problem check the wiring to sensor road debris known to damage wire and connection also check hubs if hub going the abs usually pops code [abs is incorporated into hub]

In my database, that code doesn't compute for your vehicle? With the larger engine, my database says bank 1 and bank 2, sensor 1 and sensor 2. No sensor three. The code does talk about 02 heater circuit, so, I would have to check wiring circuits. Once the problem is fixed, the check engine lite should go out. The code will probably stay in memory for so many engine warm up cycles then it is gone.

My scanner will read and erase codes. You can check some obd2 code readers, see if they will read and erase codes? Some people will take the negative battery cable loose to erase codes. I have to say, I don't like to do that. If the problem isn't fixed, the lite will just come back on, again.

Why not save a lot of money and aggravation,
and just go down the street to a local repair shop?

P0128 is a code for low coolant temperature. This is a fairly common code on the Envoys/trailblazers. The usual fix is to replace the thermostat. This is not a DIY friendly job as some of the work needs to done from the top and some needs to be done through the drivers side wheel well. The thermostat and housing will be on the drivers side lower front of the engine kind of behind the a/c compressor. It is a real bear to do!

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

Pretty common problem with these. Here's a guide to learn how to fix GM instrument clusters yourself, I used it to fix mine and it worked great.How to guide for Envoy instrument cluster repair

This code indicates a problem with the fan clutch, the speed it is running is not the speed it was commanded to run/ The fan clutch assembly needs replacing.