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Chevrolet Blazer Trouble Codes

36 messages,  Last post on Sep 09, 2008 at 7:15 PM

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#27 of 36 Reving up chevy blazer 6 cyl by labowners Apr 14, 2008 (10:43 am)
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?
#28 of 36 1995 OBD1 with OBD2 connector by blockhead1 May 11, 2008 (7:07 pm)
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? Replies to this message: jlflemmons (May 11, 2008 7:28 pm)
#29 of 36 Re: 1995 OBD1 with OBD2 connector [blockhead1] by jlflemmons May 11, 2008 (7:28 pm)
Replying to: blockhead1 (May 11, 2008 7:07 pm) 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.
#30 of 36 P0155 code 2002 Blazer by skiextreme2 May 14, 2008 (1:01 pm)
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. Help!   Thanks, Rick
#31 of 36 service engine codes on my 95 blazer by jt122801 May 30, 2008 (7:16 am)
my service engine soon light came on i went to auto zone for a diagnostic test the codes that came up are PO300,PO135,PO172 I changed the heat sensor the service light still apprears any suggestions
#32 of 36 Lots of codes by 66chevytruck Jun 02, 2008 (3:45 pm)
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. Replies to this message: johnss10 (Jul 14, 2008 10:21 pm)
#33 of 36 Re: Lots of codes [66chevytruck] by johnss10 Jul 14, 2008 (10:21 pm)
Replying to: 66chevytruck (Jun 02, 2008 3:45 pm) 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.
#34 of 36 Re: "New" '95 Blazer with some problems - codes [repairdog] by gorbey Sep 09, 2008 (9:19 am)
Replying to: repairdog (Apr 24, 2007 3:21 am) 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.
#35 of 36 95 chevey blazer by gorbey Sep 09, 2008 (10:33 am)
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?                                                                 THANK YOU IN ADVANCE                                                                  FOR YOUR HELP Replies to this message: jlflemmons (Sep 09, 2008 7:15 pm)
#36 of 36 Re: 95 chevey blazer [gorbey] by jlflemmons Sep 09, 2008 (7:15 pm)
Replying to: gorbey (Sep 09, 2008 10:33 am) 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.

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