Question about 1998 Chevrolet Blazer

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Engine codes po452, po440,po122. electrical problem?

I have several engine codes po452, po440,po122. I know what they mean but have a few other problems that might be related. My flasher continually flashes when the ignition is on although the blinkers don't actually come on unless commanded. Sometimes it will stop flashing for several minutes but still works on command. My gas gauge continually reads zero and the low fuel light is always on. Occassionally the gauge will shoot up to full and the low fuel light will go out, then it goes back on and to empty. The box for indicating which gear the vehicle is in rarely works. When it does I am usually in 4 low. Even then it is intermittent. I am thinking a bad ground might cause some of the problems and codes? Any ideas? Thanks.

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You should have 3 grounds 1 from the battery to the engine one from the engine to the body and then from the engine to the frame. Look for these grounds they look like braided flat wire. I think you also may have a loose plug or a cut in the main harness from the rear of the vehicle. Look along the frame as the harness runs from back to front. Looking at your codes I do not think they are related to your electrical problem. I gave up trying to fix my gear indicator, I had to replace the fuel tank sensor to get my gas gage working right.

Posted on May 18, 2010

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I have a 2000 sunfire gt and i got codes i need po122 po171 po440 po 136


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Po440 confirmed po440 pending why would it say that


Some fault codes require multiple stop/start cycles (operating the vehicle) before it will throw a check engine light. When the code says it is pending, the ECU has detected sensor values beyond the norm. It will monitor the systems and if the problem doesn't go away (the ECU continues to see erroneous values) it will confirm the code and turn on the check engine light.

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Pontiac grand am I had a diagnostic reading at autozone for diagnostic codes po128,po440 and p1189 don't know what they mean for a 2003 Pontiac grand am gt 3.4 liter and v6 engine vehical


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Sensor codes


http://www.obd-codes.com/p0453.....
http://www.obd-codes.com/p0452

http://www.obd-codes.com/p0420
This is what the codes mean.

Your carburetor and fuel system is acting up (or you lost the fuel cap!)
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1999 chevy siverado 4.8l diagnostic tester says i have po300,po121,po122,po440,p0449,po452 and gm p1639


Maybe.
Codes 121 and 122 are for the throttle position sensor circuit.
Code 400 is EGR and codes 449 and 452 are for the EVAP system.
Code 1639 is for a problem with the 5 volt reference circuit from the engine computer.
The throttle position sensor could be failing which could prevent the gas pedal from working. And the 5 volt reference problem could shut down the computer which would kill the engine. EGR is an emissions component and EVAP is the system that vents gas fumes from the gas tank.
Codes are only a guide for a mechanic to troubleshoot the circuits involved. They do not mean a component is faulty.

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1 Answer

Trouble codes PO440 and PO452


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The check engine light came on, the code reader indicates PO122. What is the issue and what can I do. I am on a road trip.


A GM PO122 code means that the the car's computer has detected that the TPS ( throttle position sensor) is reporting too low a voltage.

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Po452 trouble code changed sensor engine light


you might try unhooking the battiey for 20min both + and - posties cuz that will force the computor to have to resest only if you have addressied the fuel pressure problem which taht would most likly be your filter which isn't all that much

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Code information


what engine????????????po122 is a throttle position sensor problem
p1693 may also be related, fix the tps first.

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