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Old 06-19-2016, 04:51 PM   #1
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Default Need a little help with multiple odb2 faults

I've got a 2005 Trailblazer with p0202,p0203,p0204,p0205,p0206 and p0128 faults. I know the p0128 is a thermostat fault and the others relate to injector faults but I really need to find a starting point.
My wife said the car got real jerky then shut down.


Thank you in advance
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Old 06-19-2016, 05:31 PM   #2
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What? No P0201? You were one cylinder away from perfection!

I am not sure exactly how the power is distributed to the injectors, but I would run through the injector wiring and check wiring at the PCM for starters. The likelyhood of 5 out of 6 injectors dying at once is relatively low.
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Old 06-19-2016, 05:36 PM   #3
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And, to give some insight,

http://www.obd-codes.com/p0203
Quote:
When the injector is switched off, the PCM expects to see a voltage that is close to battery voltage or "high". If it doesn't see the expected voltage the PCM will set this code. The PCM also monitors resitance in the circuit. If the resistance is excessively low or high it will set this code.

The symptoms for this code will likely be a misfire and a rough running engine. Poor acceleration. The MIL will also be illuminated.

The causes of a P0203 engine light code could be any of the following:
-Bad injector. This is usually the cause of this code but doesn't rule out the possibility of one of the other causes
-Open in the wiring to the injector
-Short in the wiring to the injector
-Bad PCM
Hopefully it is something in the wiring, because it looks like the most likely culprit would be the PCM exploded.
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Old 06-19-2016, 05:48 PM   #4
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Quote:
Originally Posted by rjolly87 View Post
What? No P0201? You were one cylinder away from perfection!

I am not sure exactly how the power is distributed to the injectors, but I would run through the injector wiring and check wiring at the PCM for starters. The likelyhood of 5 out of 6 injectors dying at once is relatively low.
Yeah that'* how I roll I guess just shy of perfection! Lol
That'* where I headed but the wiring seems to be good physically but I'll need to get a schematic to check voltage readings.
The codes make it seem electrical but could lack of fuel or a dirty throttle body give these codes?
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Old 06-19-2016, 11:40 PM   #5
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Thanks for the help everybody. I've got a few things to check for sure. I'll let you know what I come up with.
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Old 06-19-2016, 11:45 PM   #6
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As you mentioned, my take also is that the code is electrical related as well. Fuel delivery issues tend to throw different codes.
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Old 06-23-2016, 10:41 PM   #7
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Here ya go:

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Old 06-25-2016, 01:57 PM   #8
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I hate to say it, but in thinking about this, I am leaning towards a pcm failure. I would think if it is a power delivery issue, the truck would have simply dropped dead. Unless the wiring was compromised running from most of the injectors. If that is the case though, I would expect evidence of some traumatic event.
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