p0300 - Hummer Forums - Enthusiast Forum for Hummer Owners - Threads Tagged with p0300

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Threads Tagged with p0300

Threads Tagged with p0300

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leakage, low compression, p0171, p0300, rebuild

2007 Hummer H3 3.7L - Low Compression - P0300 P0171 - Engine Rebuild Thread

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Multi-page thread

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Spanovich008 on Apr 10, 2025

Aug 17, 2025 04:04 PM
by Spanovich008

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17

4,249

engine mis-fire, p0300

2 Attachment(s)

2023 P0300 Code Engine mis-fire thread-2006 H2 6.0L

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LuvMy2006H2 on Nov 9, 2023

Dec 18, 2023 08:31 AM
by legerwn

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62

8,638

misfire, p0300, pcv, wiring

hummer h3 misfiring...?

yoH3 on Oct 6, 2023

Oct 11, 2023 08:42 AM
by Doc Olds

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8

1,220

Smile

cel, fixed, p0300

Check Engine Light P0300 Cure

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Bill_AK on Dec 10, 2019

Apr 10, 2021 08:34 PM
by legerwn

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12

9,858

0300, 05, 2003, code, forum, h2, hummer, knock, misfire, misfires, missfire, p0300, po300, random, sensor

Random misfire code P0300? H2

pm1010 on Jul 21, 2012

Sep 20, 2019 08:01 AM
by madmayo

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5

46,834

2007, 2431, c0268, code, giving, h3, hummer, p0014, p0300, p2119, p2431, popping, trouble

7 Codes 2008 H3 with 84000 miles

Gunfighter13 on Dec 2, 2013

Jul 24, 2014 10:26 PM
by Happy Hummer

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8

7,903

PRIVATE For Sale / Trade Classifieds

0305, 2006, code, coil, ebay, error, h3, hummer, p0300, p0305, p0305b, pack, po305

10 Attachment(s)

P0300 and P0305 Codes

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Multi-page thread

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norinco3264 on Apr 21, 2014

Apr 25, 2014 05:51 PM
by hummerz

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20

37,569

PRIVATE For Sale / Trade Classifieds

2006, code, codes, h3, hummer, long, p0300

2 Attachment(s)

There it is, P0300 code. Likely head #2 is bad.

larry0071 on Mar 16, 2014

Mar 29, 2014 05:16 PM
by larry0071

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7

26,985

PRIVATE For Sale / Trade Classifieds

Poll

2006, bad, cylinder, dtc, engine, gm, h3, head, heads, hummer, l52, misfire, p0300, problems, sticky, valve

Sticky Thread

Sticky Poll

Exactly how many have had HEAD/Valve Problems

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Multi-page thread

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Dennis on Nov 30, 2006

Dec 17, 2013 11:22 AM
by keystone

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245

81,809

Head and Valve Problems.

06, check, code, codes, engine, error, h3, hummer, light, p0014, p0128, p0300, p0303, po128, trooper

P0300 and P0128

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Multi-page thread

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Matthew C. Powell on Jan 6, 2013

May 1, 2013 01:06 PM
by Xlr8n

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12

15,155

PRIVATE For Sale / Trade Classifieds

06, 2006, code, codes, fault, fuel, h3, hummer, misses, ol, p0300, p0300codep0128, replace, solenoid, sys, vvt

2006 H3 p0300 code with freeze frame

alonna on Mar 19, 2013

Mar 28, 2013 04:21 PM
by alonna

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9

16,481

PRIVATE For Sale / Trade Classifieds

06, 2006, 69k, code, cost, differential, front, good, h3, high, hummer, miles, mount, owners, owning, p0300

Potential H3 Owner

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Multi-page thread

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LifeIsGood on Jan 4, 2013

Jan 23, 2013 03:44 PM
by Doc Olds

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30

15,705

PRIVATE For Sale / Trade Classifieds

2006, camshaft, code, codes, correlation, falla, h3, hummer, ismy, mifires, p0017, p0017p0300, p0017po300, p0171, p0300, sensor

P0017 & P0300 Codes

ericksos on Dec 18, 2012

Dec 18, 2012 11:59 AM
by ericksos

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0

9,844

PRIVATE For Sale / Trade Classifieds

canister, code, evap, h2, h3, hand, held, hummer, ii, m3, obd, obdii, p0300, plug, po300, programmer, wires

p0300 code

H3I5 on Apr 12, 2012

Apr 27, 2012 03:23 PM
by H3I5

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4

7,283

PRIVATE For Sale / Trade Classifieds

Angry

101, 2003, 2005, code, codes, diagnostic, fix, h2, hummer, obd, p0300, po101, po101po300, po300, seafoam

Fed up!

darnell72 on Feb 12, 2012

Mar 11, 2012 12:10 AM
by chesh97

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5

3,849

PRIVATE For Sale / Trade Classifieds

Angry

05, 2006, 35, chevy, cjyork, code, colorado, cyl, engine, forum, h3, hummer, p0300, po300, water

Another dreaded code P0300

CJYork on Oct 22, 2011

Oct 26, 2011 09:09 PM
by CJYork

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8

36,764

PRIVATE For Sale / Trade Classifieds

0300, 07, 37, code, codes, error, firer, h3, hummer, miss, missfire, p0300, p0300hummerh3, shaking, start, starts

p0300 random missfire

mrigor on Jul 29, 2011

Jul 30, 2011 01:39 AM
by Muddydawg75

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4

5,637

PRIVATE For Sale / Trade Classifieds

2006, 35, actuater, actuator, camshaft, check, code, engine, h3, hummer, light, open, p0300, position, stuck

check engine light

roughneck1115 on Feb 1, 2011

Feb 6, 2011 12:05 AM
by TAINTER

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6

2,861

PRIVATE For Sale / Trade Classifieds

07, 2003, code, codes, cyclinder, cylinder, dtc, h2, h3, hummer, misfire, multiple, p0300, random, reflash

DTC Code P0300 - Multiple Random Cyliner Misfire

Calgary on Jul 19, 2007

Jul 31, 2010 11:29 PM
by Jkmako

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1

16,335

PRIVATE For Sale / Trade Classifieds

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