The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 99-06 GMT800 Chevy and GMC Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 11-13-2018, 11:10 PM   #1
rickrod3
Registered User
 
Join Date: Aug 2012
Location: Oakland NJ
Posts: 25
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
__________________
05 Silverado 2500HD. 6.0 engine
rickrod3 is offline   Reply With Quote
Old 11-14-2018, 02:48 AM   #2
EVRLET
Junior Member
 
EVRLET's Avatar
 
Join Date: Aug 2015
Location: Las Vegas NV
Posts: 97
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.
__________________
Customization is what you want it to look like -- not what other people think it should look like
EVRLET is offline   Reply With Quote
Old 11-14-2018, 10:17 PM   #3
rickrod3
Registered User
 
Join Date: Aug 2012
Location: Oakland NJ
Posts: 25
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
__________________
05 Silverado 2500HD. 6.0 engine
rickrod3 is offline   Reply With Quote
Old 11-15-2018, 03:20 PM   #4
hatzie
Senior Member
 
hatzie's Avatar
 
Join Date: Oct 2008
Location: Wentworth, NH
Posts: 3,177
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???
__________________
1959 M35A2 LDT465-1D
1967 Dodge W200 B383, NP420/NP201
1969 Dodge Polara 500 B383, A833
1972 Ford F250 FE390, NP435/NP205
1976 Chevy K20, 6.5L, NV4500/NP208
1986 M1008 CUCV
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.
hatzie is online now   Reply With Quote
Old 11-16-2018, 06:02 PM   #5
rickrod3
Registered User
 
Join Date: Aug 2012
Location: Oakland NJ
Posts: 25
Re: P0300 Code

Thanks I'll try that
__________________
05 Silverado 2500HD. 6.0 engine
rickrod3 is offline   Reply With Quote
Old 11-16-2018, 08:05 PM   #6
hatzie
Senior Member
 
hatzie's Avatar
 
Join Date: Oct 2008
Location: Wentworth, NH
Posts: 3,177
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.
__________________
1959 M35A2 LDT465-1D
1967 Dodge W200 B383, NP420/NP201
1969 Dodge Polara 500 B383, A833
1972 Ford F250 FE390, NP435/NP205
1976 Chevy K20, 6.5L, NV4500/NP208
1986 M1008 CUCV
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.
hatzie is online now   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 04:40 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2018, vBulletin Solutions Inc.
Copyright 1997-2013 67-72chevytrucks.com