Need a little help with multiple odb2 faults
06-19-2016 | 04:51 PM
#1
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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
My wife said the car got real jerky then shut down.
Thank you in advance
06-19-2016 | 05:31 PM
#2
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From: Las Cruces, NM
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.
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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RobJ65 (06-19-2016)
06-19-2016 | 05:36 PM
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From: Las Cruces, NM
And, to give some insight,
http://www.obd-codes.com/p0203
Hopefully it is something in the wiring, because it looks like the most likely culprit would be the PCM exploded.
http://www.obd-codes.com/p0203
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
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
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RobJ65 (06-19-2016)
06-19-2016 | 05:48 PM
#4
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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.
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.
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?
06-25-2016 | 01:57 PM
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From: Las Cruces, NM
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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