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Old 11-13-2018, 11:10 PM   #1
rickrod3
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P0300 Code

My truck an 05 Silverado with a 6.0 Engine seems to run good.
My check engine light comes on giving me a P0300.

The following is the freeze frame data:
DTCFRZF P0300
Fuel sys 1 CL
Fuel sys 2 CL
Load % 43.5
ECT F 377
SHRTFT1% -0.8
Longft1% 6.3
SHRTFT2% -0.8
LongFT2%4.7
Map KPA 50.0
RPM 2488
VSS 65 MPH
Spark advance 33.5
IAT 48 out door was 40
MAF g/s 54.23
TP% 29.4

The ECT of 377 jumped out at me so I went out to the truck to see what the temperature guage read it was around 210 I connected the scanner to live data and the ECT read 201 F but the IAT read 91F when it was 40F

I guess I'll be checking out these 2 sensors
Any advice would be appreciated

Rick
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Old 11-14-2018, 02:48 AM   #2
EVRLET
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Re: P0300 Code

Most people don’t believe that a bad coolant sensor can cause a misfire. However, the computer that sees a “really hot temp” will compensate for what it thinks is a lean condition. I would bet that you have a faulty ECT sensor. Let us know if that’s the case.
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Old 11-14-2018, 10:17 PM   #3
rickrod3
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Re: P0300 Code

Thanks for your reply Evrlet

I cleared the code, drove home as I did yesterday with the scan tool on live data and I attempted to make the code come back by driving and a hard acceleration like last night the SES light flashed but did not stay on so no code.

I did start fooling with the connector but it got too late for work and I had no time.

I was monitoring the ECT and it got no higher than 202 degrees F
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Old 11-15-2018, 03:20 PM   #4
hatzie
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Re: P0300 Code

Is there a problem with the connector, corrosion, or damage to the wiring to the ECT sensor?

Try Deoxit D5 on the connector and sensor pins then plug/unplug it several times???
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Old 11-16-2018, 06:02 PM   #5
rickrod3
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Re: P0300 Code

Thanks I'll try that
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Old 11-16-2018, 08:05 PM   #6
hatzie
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Re: P0300 Code

It's not impossible to have the sensor flaking out intermittently too... I usually don't shotgun stuff but... They're cheap.
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1959 M35A2 LDT465-1D SOLD
1967 Dodge W200 B383, NP420/NP201 SOLD
1969 Dodge Polara 500 B383, A833 SOLD
1972 Ford F250 FE390, NP435/NP205 SOLD
1976 Chevy K20, 6.5L, NV4500/NP208 SOLD
1986 M1008 CUCV SOLD
2000 GMC C2500, TD6.5L, NV4500
2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263
2009 Impala SS LS4 V8


RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...Please include at least the year and model in your threads. It'll be easier to answer your questions.
And please let us know if and how your repairs were successful.
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Old 12-30-2018, 08:40 PM   #7
OutlawDrifter
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Re: P0300 Code

I had a P0300 I chased on my LQ9 swapped Z28 for a year. Finally found it with a noid light set. Ended up being a fuel injector plug that had 1 strand of copper left connecting it.

I agree a faulty sensor could be the culprit. Grounds are a huge player in the LS engines as well, make sure they are all clean. Next place I would look into was plugs/wires.
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