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Chevrolet Blazer Trouble Codes



  • jlflemmonsjlflemmons Posts: 2,240
    Well, if the crank sensor is not working you should get a code 0335 or 0336. And if the sensor has completely died, she ain't gonna start.
  • Hi all, I had to get through some fairly deep water (on the road) and afterwords the service engine soon light flickered a few times then shut off. I was at about the same speed as the pickup that was next to me. About four days later the service engine soon light came on and hasn't gone off. Any possibilities other than getting codes? Like maybe moisture somewhere it shouldn't be?
  • I have a 1995 chevy blazer that after it starts it revs up and down and misses like crazy. The check engine light comes & goes. I've already changed the fuel pump and spider injector about 1 year ago. The check engine code comes up emissions control, but that wouldn't make the engine rev up & down on it's own. It's so loud that it makes my cat converter knock. I checked it & it's fine. Anyone know what this could be? :confuse:
  • blockhead1blockhead1 Posts: 1
    I recently purchased a 95 Blazer. The body and interior are in great shape but the transmission was bad, and it had sat up for almost four years. I got it running and rebuilt the tranny but, as soon as I drove it, the check engine light came on. I have a code scout 2500 scanner that will read both OBD1 & 2 codes but I have a problem. The computer is an OBD1 but the connector is a 16 pin OBD2 type. My scanner will not communicate with the computer, any advice?
  • jlflemmonsjlflemmons Posts: 2,240
    On an OBD1 system, short the A and B pins in the connector with a paper clip. Look closely and you should see the pin identifiers on the connector under the dash. This will put the system into a diagnostic mode.

    The SES or CES lamp will flash a 12 (flash, pause, flash flash) three times to indicate that the ECM is in diagnostic mode. After a pause, the lamp will flash the numeric code for any faults stored. It will flash each code three times, then go back to flashing the '12" code.
  • skiextreme2skiextreme2 Posts: 30
    :mad: I get the P0155 and it says heater circuit malfunction, bank 2 sensor 1. The store sold me a $97 o2 sensor and it didn't solve the problem. It's a 2002 Blazer. 4.3, auto, 4WD.

    Any idea how to figure out a problem with a heated circuit related to oxygen sensor bank 2 sensor 1. I was told it's one of the white wires but I don't have a clue as to how to check something like that and there isn't any space to chase the wire and see where it goes (that I can see). Or, maybe someone has had this problem?
    It started when I went through some water that was up to the doors. The CEL blinked a few times then shut off and two days later it came on and hasn't gone off except when I cancelled it after installing the o2 sensor.

    Thanks, Rick
  • jt122801jt122801 Posts: 1
    my service engine soon light came on i went to auto zone for a diagnostic test the codes that came up are
    I changed the heat sensor the service light still apprears any suggestions
  • I have a 2001 Chevy Blazer 4.3L 4x4.
    I had some codes come up and i replace the smog pump and the drivers side check valve for the secondary air injection system. the valve burned up and so did the hoses so i disconnected everything until i got a new check valve. the pump was fine besides some debris which i cleaned out, but i hard wired it to check n it was still working. the day after i fixed everything i was driving it and the check engine light started flashing. i pulled off and shut the blazer off, turned it on n it stayed on. it kept flashing when i did over 30 mph or 1500 rpm.
    the codes i pulled were:
    PO102: mass airflow sensor circuit low frequency
    PO141: O2 sensor bank 1 sensor 2
    PO300: random misfire
    PO410: secondary air injection system
    PO463: Fuel level sensor 1 circuit high voltage
    B2961: key in ignition circuit malfunction
    CO265: EBCM motor relay circuit
    CO245: EBCM Control valve circuit
    CO246: "
    CO251: "
    CO252: "

    any ideas where to start? what is necessary right now and what i can hold off on? im broke and this is my only vehicle :( also if you have an idea of how much the parts will cost that would e helpful.
    Thank you.
  • johnss10johnss10 Posts: 46
    The first thing to do is to clear all these codes, and see what happens. If the SES light comes on again, read the codes again and see what youve got. Some of these codes could have accumulated over time, and don't relate to aything anymore.
  • is the EGR hard to change because I have the same code come up today 1406 and the inside of the vehicle smells like gas. Now my rpm keeps going up and down.
  • My check engine light came on and the blazer was running rough so I pulled in to auto zone and had them hook up the machine to it and code p1406 came up. I was told buy a dealer that it was a EGR sensor. So I have 3 questions for any one that can help me 1) will it make the rpm needle go crazy (up and down) 2) it it hard to replace and 3) where is it located?

    FOR YOUR HELP :cry:
  • jlflemmonsjlflemmons Posts: 2,240
    1. It can make the idle irratic
    2. Located on the front of the engine. Go to Autozone online and you can look up the part and see what it looks like.
    3. Easy repair.
  • hey has any one had this trouble
    I have checked fuses and replaced mir 3amp fuse that should run the tailgate and door lock and power mirrors as per chevy but still no go.
    key fob will not open up tail gate as well.
    any ideas ?
    Doug :(
  • duntovduntov Posts: 133
    If the accessory control switches are functional, it is likely that the relay for those accessories is bad. Replace the power door lock relay because it is also common to the other accessories you mentioned. You can use Power Door lock Relay from AC Delco F1788, $42 (GM 88922752 - MSRP $78 ); Standard Motor Parts RY246, $26; or Air Tex 1R1269, $23. That relay was used on many GM vehicles with power door locks since 1980. The relay is located behind the headlight control switch cluster on a 1989 - 1995 S10 Blazer. I am not sure where it is located on other GM vehicles. If a auto repair shop replaces the relay, they will charge 1/2 hour labor cost plus the cost of the relay. That will be about $100+ total .replacement cost.

    A bad relay can also cause a 200+ ma parasitic power drain on the battery even when the ignition key is off. If the vehicle sits for a week or two without being started, the power drain could completely discharge the battery, especailly if the battery is over 18 months old.
    Any idea what these codes mean and how to repair the problem?

    1996 Blazer LT 4.3 190,000 miles & still runs good
  • jlflemmonsjlflemmons Posts: 2,240
    P0719: Do your brakelights work? This is the code for low voltage in the brake light circuit. Blown fuse?

    P0753: Transmission solenoid related. How is the transmission shifting? Could be anything from a shorted harness to the tranny to a bad shift solenoid.
    p0719 - Corrected by installing a new break switch and fixing a frayed wire.

    p0753 - Corrected by replacing both solenoids in trans.

    $54 in of parts & $314 in labor to to pass emmisions test.

    Go figure.....
  • I've had some problems with my blazer. It started skipping/missing a little, not much. Drove it from a cold start about 3 miles to get gas, gave me trouble cranking but did eventually crank. Did this a couple times. Drove it between these events and then one day at work tried to leave and wouldn't crank again, at all. Tried a few days later, no luck. Been about 3 weeks and this morning it did crank, idled for about 15 minutes, drove it a couple blocks and parked it, shut it down, restarted it but did start hard. Talked with a mechanic and was going to drop it off for them to do the fuel pressure check and all. Cranked right up, ran a minute, then stalled and now it won't crank again.

    We put a new fuel pump on it about 1-1/2 yrs ago but the oil changes haven't been kept up for the last year or so. The check engine light has been on for a long time but never did anything about it because it seemed to run fine. We are short on vehicles and I need help. Hoping it's not the spider injector. Can anyone give me direction?
  • Sounds like your EGR valve :)
  • ppickappicka Posts: 2
    I have a 99 Blazer w/63K miles when the 4 WD light came on.I went to a Chevy dealer and was told that a DTC CO323 was the problem and would cost $830.00 to fix .Additional info from dealer :Regular production option code NP8-transfer case two speed push button.Could anyone help me understand this problem ?Also if I have this fixed will my 4 WD work?? Thanks
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