Error Codes P0172 and P0300 - TerrainForum.net: GMC Terrain Forum
 
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post #1 of 3 (permalink) Old 01-17-2020, 04:42 PM Thread Starter
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Error Codes P0172 and P0300

Hello all,

This is my first post here. I tried looking for posts with similar issues but could not find quite what I was looking for.

2010 GMC Terrain, 2.4L, Front Wheel Drive

My check engine light just came on. We took it to AutoZone to get the error codes checked. They came back with a printout explaining that the two error codes they read were: P0172 "System Too Rich (Bank 1)" and P0300 "Random Misfire Detected". It also stated that the most likely issue is my Timing Chain.

After a few calls to nearby mechanics I've been told that it may be my timing chain, and it'd be (cheapest quote I have recieved) $3500 for a fix. They also have stated it could be several other issues.

Currently the vehicle is running well. I do not hear any slapping or rattling while running or idling. A couple times in the last week it did run and die about 3 seconds after turning off the ignition switch. I think it sounds like there is a leak in the exhaust. Aside from that, no issues.

If anyone has advice on how I can troubleshoot to verify Timing Chain vs other issues, I would greatly appreciate it.
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post #2 of 3 (permalink) Old 01-18-2020, 03:15 PM
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The first error is a consequence of the second error. If there are misfire, then look primarily at the spark plugs and ignition coil. A rich mixture means that in some cylinder the fuel does not burn. And the lambda probe senses this and gives the error that the mixture is rich.
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post #3 of 3 (permalink) Old 01-27-2020, 12:36 AM
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Originally Posted by SPP View Post
Hello all,

This is my first post here. I tried looking for posts with similar issues but could not find quite what I was looking for.

2010 GMC Terrain, 2.4L, Front Wheel Drive

My check engine light just came on. We took it to AutoZone to get the error codes checked. They came back with a printout explaining that the two error codes they read were: P0172 "System Too Rich (Bank 1)" and P0300 "Random Misfire Detected". It also stated that the most likely issue is my Timing Chain.

After a few calls to nearby mechanics I've been told that it may be my timing chain, and it'd be (cheapest quote I have recieved) $3500 for a fix. They also have stated it could be several other issues.

Currently the vehicle is running well. I do not hear any slapping or rattling while running or idling. A couple times in the last week it did run and die about 3 seconds after turning off the ignition switch. I think it sounds like there is a leak in the exhaust. Aside from that, no issues.

If anyone has advice on how I can troubleshoot to verify Timing Chain vs other issues, I would greatly appreciate it.
What happened? Did you end up replacing the timing chain?
I have the same code and same problem with engine running a few seconds after turning off.
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