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Alan Baxter

By Alan Baxter
in Ask A GM Technician

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Jstevens7700 Enthusiast

Jstevens7700

Posted
Posted

Have you tried to erase the trouble codes? It took a few days of driving and erasing the same codes for my computer to recognize the new sensors.

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Alan Baxter New Member

Alan Baxter

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I used the scanner and determine which bank and sensor it was. Changed it, 3 months later it came back. I thought I had a bad sensor, changed it again. 3 days later it came back in. Left alone, it went out again. I left a alone, it came back on. Right now the check engine light is off, and it has one code in the scanner, P0135. This is not a pending code, this is an actual code and no check engine light?

davester Senior Enthusiast

davester

Posted
Posted

Well, there are 3 classes of engine codes (roughly):

-more serious problems, where damage to the engine/emissions system can/is happening right now: CEL flashes

-more general emissions problem: CEL is turned on

-everything else: CEL remains off

 

And how soon the CEL goes off after fixing the problem depends on the specific problem.  Some things run the test right away (like, say, the MAF sensor), so once it's fixed, the light will go off right away, other codes need a certain number of key cycles (where you start/stop the engine) without a problem for that system for the light to go off, and others need a test to complete that only happens under certain driving conditions, so it can take much longer to turn off.

 

 

Doug_Scott Senior Enthusiast

Doug_Scott

Posted
Posted
4 hours ago, Alan Baxter said:

I used the scanner and determine which bank and sensor it was. Changed it, 3 months later it came back. I thought I had a bad sensor, changed it again. 3 days later it came back in. Left alone, it went out again. I left a alone, it came back on. Right now the check engine light is off, and it has one code in the scanner, P0135. This is not a pending code, this is an actual code and no check engine light?

Doing a simple google search on that error code gave this information on possible causes...

  • Faulty Pre-Catalyst oxygen sensor
  • Faulty wiring/connections
  • Short or open ground in the wiring
  • Blown Fuse
  • Engine coolant temperature sensor is not operating correctly
  • Faulty Power Control Module

Did you happen to check these things?  A bad ground can give a voltage high error.  Bad grounds are notorious for being intermittent. 

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