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04-26-2017, 10:51 AM
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Join Date: May 2007
Location: East of Leduc
Posts: 489
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GM Code P0802
Wondering if anyone has come across this. 2003 GMC 2500HD 8.1L with 4 speed auto Allison.
Out of the Blue won't crank. Lots of juice ( new Battery, 12.51 V, 800 amp hold ), replaced starter. Then cleared the code, all good until I shut it off. Same code. Picked up a new Neutral safety switch, that's my next step. All fuses and relays test out good.
Thanks in advance.
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"No sea too Ruff, No Muff too Tuff"
KOD.
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04-26-2017, 11:07 AM
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Join Date: May 2007
Location: WMU 214
Posts: 1,817
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codes
Did you google the code ?
Lots of stuff on it. ie The P0802 is an ECM code that sets when the transmission module requests that it turn on the check engine light.
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04-26-2017, 11:16 AM
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Join Date: Mar 2009
Location: Edmonton
Posts: 9,672
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Google is your friend, i bought the scanner, google tells me what the code means and then I know what part I'm changing
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04-26-2017, 11:27 AM
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Join Date: Jun 2007
Location: Onoway, Alberta Beach
Posts: 604
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04-26-2017, 11:29 AM
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Join Date: May 2007
Location: East of Leduc
Posts: 489
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Yes, googled it. There are so many different things that can cause it though. Mine didn't trigger the check engine and the selector indicator works perfectly. Just all of a sudden wouldn't crank. Of course mine has no common problems most have experienced. Frustrating !!
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"No sea too Ruff, No Muff too Tuff"
KOD.
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04-26-2017, 11:39 AM
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Join Date: Mar 2009
Location: Edmonton
Posts: 9,672
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I have a new code on my tired Explorer. Low idle which i noticed the last couple weeks before the code showed up. Probably at least 6 different possibilities as to the cause, each one getting progressively more expensive.
You can search some GM forums. I find the forums can help eliminate changing too many parts first as guys who have had the issue tend to know what to look for first. Hope it's not the ECM, expensive part.
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04-26-2017, 11:47 AM
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Join Date: May 2007
Location: East of Leduc
Posts: 489
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I hear you
Being old school, immediately brain said starter. 250 bucks later, soaked, muddy, frozen fingers and still DEAD !! So 100 bucks to go 6km for a tow to our plant, tested everything on the wiring diagram still DEAD. Scanned it again, nothing but this time I cleared about 3 times and start !! Drive home and dead again. Scan it again and whammo P0802. The only thing I didn't do was jump the NSS so I bought one.
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"No sea too Ruff, No Muff too Tuff"
KOD.
Last edited by Kodiak; 04-26-2017 at 11:48 AM.
Reason: grammar
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04-26-2017, 11:49 AM
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Join Date: May 2007
Location: East of Leduc
Posts: 489
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Next will be the ignition switch. It's intermittent so what else can a guy do !!
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"No sea too Ruff, No Muff too Tuff"
KOD.
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04-26-2017, 04:22 PM
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Join Date: May 2007
Location: WMU 214
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Chevy
Still sounds like the starter to me. Check the power to the starter when it wont start.
I just went through a similar issue with my 2004. Would start 10 times in a row, then nothing. Would go everytime with a boost. Changed out the battery, it was good for a week, then same thing. Then I thought it was the cable, I saw online they have been an issue with internal corrosion.
Turned out, it was a bad starter.
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04-26-2017, 04:58 PM
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Join Date: Sep 2016
Location: Calgary
Posts: 361
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Shhhhh
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04-26-2017, 05:51 PM
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Join Date: Oct 2009
Location: Sherwood Park Ab
Posts: 6,280
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Quote:
Originally Posted by jrowan
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Valuable info! Nice job...
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An awful lot of big game was killed with the .30-06 including the big bears before everyone became affluent enough to own a rifle for every species of game they might hunt.
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04-27-2017, 11:37 AM
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Join Date: May 2007
Location: East of Leduc
Posts: 489
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Thanks Guys, I'll post how it turns out if it ever quits snowing / raining !! Hopefully soon, not used feeling like a bug on the road in a Malibu, not to mention the different way you get treated...............
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"No sea too Ruff, No Muff too Tuff"
KOD.
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05-05-2017, 12:15 AM
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Join Date: Mar 2014
Location: Mountain view county
Posts: 23
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Check cables and connections are good. I've seen a lot of no starts that were it turned out something simple. If battery cables are good I'd check the plugs at the modules, I don't know about Chevy but some dodges I've owned have the modules wear out at the plug, if safe to do so have someone carefully/slowly wiggle the plugs while trying to crank. If a wiring diagram is available I'd also check any grounds in that circuit, grounds can do some funny things.
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"All generalizations are false, including this one"
-Mark Twain
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05-05-2017, 05:57 AM
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Join Date: May 2007
Location: Westlock
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05-05-2017, 03:36 PM
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Join Date: May 2007
Location: East of Leduc
Posts: 489
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Haha
Very Funny Reeves, now I know why you operate the Hoe and not work around it........
Turned out to be the Neutral Safety Switch on the outside of the Allison. Just a FYI, make sure you have a heat gun for the top plug. Some nasty Glue type stuff, almost like a hot Glue gun stick. Heat to take off and to reinstall.
Big thanks to everyone for the info !! Frustrating to say the least.
__________________
"No sea too Ruff, No Muff too Tuff"
KOD.
Last edited by Kodiak; 05-05-2017 at 03:37 PM.
Reason: grammar
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05-05-2017, 04:35 PM
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Join Date: May 2007
Location: Westlock
Posts: 5,532
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Last edited by Reeves1; 05-05-2017 at 04:47 PM.
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05-05-2017, 05:12 PM
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Join Date: May 2007
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05-08-2017, 09:52 AM
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Join Date: May 2007
Location: East of Leduc
Posts: 489
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Lol
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"No sea too Ruff, No Muff too Tuff"
KOD.
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05-08-2017, 12:46 PM
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Join Date: Jan 2014
Location: calgary
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Pm sent
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