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6.5l td drivability issue's

Discussion in 'GM 6.5 Diesel Engines' started by Budd Comeau, Jan 11, 2018.

  1. Budd Comeau

    Budd Comeau New Member

    15
    13
    Jan 11, 2018
    Texas
    OK so this my first experience with the 6.5l Chevrolet engine.
    1999 C3500 2wd 5spd
    1ton.
    Initially got these codes
    P0216
    Injection stepper motor fault.
    P0236
    Waste gate solenoid fault.
    P0238
    turbo boost sensor to high.
    P0251
    Pump cam reference pulse error.
    P0370
    High resolution circuit fault.
    P0606
    PCM internal communication interupt.
    P1216
    Fuel solenoid response to short.
    P1217
    Fuel solenoid response to long
    Changed all major sensors.
    Lift pumps, fuel filter.
    Cleared codes.
    Tonight I got codes P0251 P0606
    Please tell me what to fix.
    Starts right up,idles no miss,1,2,3,4 gear no issues.
    5th gear stutters then dies wait a few seconds starts right back up.
     
    MrMarty51 likes this.
  2. ak diesel driver

    ak diesel driver 6.5 driver

    12,363
    2,076
    Feb 7, 2009
    alaska
    I'd start with grounds. Sounds like a ground or power issue to the PCM
     
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  3. Budd Comeau

    Budd Comeau New Member

    15
    13
    Jan 11, 2018
    Texas
    Thanks I'll try that.
    Not looking forward to another 500 or better repair cost.

    Sent from my SM-N910V using Tapatalk
     
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  4. JMJNet

    JMJNet Recruit

    1,950
    126
    May 6, 2008
    Richardson, TX
    You said "changed all major sensors", which one specifically did you change?
    Are you putting ACDelco sensors?

    The word all does not mean a thing in trying to help you.
     
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  5. Budd Comeau

    Budd Comeau New Member

    15
    13
    Jan 11, 2018
    Texas
    Turbo boost sensor ,vacuum sensor, crank position sensor, baro sensor.
    Yes ACDelco.

    Sent from my SM-N910V using Tapatalk
     
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  6. Big T

    Big T Well-Known Member

    3,348
    705
    Sep 25, 2009
    Fullerton, CA
    The sensors are likely doing their job and sensing a problem that's not due to the sensor.
     
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  7. Budd Comeau

    Budd Comeau New Member

    15
    13
    Jan 11, 2018
    Texas
    Kind of figured that one out the hard way.
    Everything I research keeps me thinking ECM.
    I keep hoping I'm wrong.
    But guess that's why I ask for help.
    First 6.5l td.
    Don't know enough about the automotive computer systems.
    Real learning curve there.

    Sent from my SM-N910V using Tapatalk
     
    MrMarty51 likes this.
  8. Will L.

    Will L. Well-Known Member

    6,928
    4,972
    Jan 25, 2013
    Boulder City Nv
    Have you removed and cleaned all grounds yet?
     
    MrMarty51 likes this.
  9. Budd Comeau

    Budd Comeau New Member

    15
    13
    Jan 11, 2018
    Texas
    Battery grounds ,engine ground,going to check ECM ground tomorrow.

    Sent from my SM-N910V using Tapatalk
     
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  10. ak diesel driver

    ak diesel driver 6.5 driver

    12,363
    2,076
    Feb 7, 2009
    alaska
    pay close attention the the grounds on the rear passenger side of the intake manifold, close to the firewall. Should be 3 wires. One of those is the PCM ground
     
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  11. Budd Comeau

    Budd Comeau New Member

    15
    13
    Jan 11, 2018
    Texas
    Thanks

    Sent from my SM-N910V using Tapatalk
     
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  12. MrMarty51

    MrMarty51 Well-Known Member

    969
    705
    Aug 1, 2017
    Miles City, Montana
    Get a vacuum gauge and check the vacuum pump.
    Not enough vacuum will throw all kinds of codes for the turbo system.
    welcome to the forum Budd.
     
  13. Budd Comeau

    Budd Comeau New Member

    15
    13
    Jan 11, 2018
    Texas
    OK I'll see if I can rent one or something.

    Sent from my SM-N910V using Tapatalk
     
  14. MrMarty51

    MrMarty51 Well-Known Member

    969
    705
    Aug 1, 2017
    Miles City, Montana
    If You are not able to rent a vac gauge, I do not believe they are real expensive.
    As an alternate, a hand operated vacuum pump can be used too, good idea to have a hand operated vacuum pump when diagnosing some issues anyways.
     
    Budd Comeau likes this.
  15. MrMarty51

    MrMarty51 Well-Known Member

    969
    705
    Aug 1, 2017
    Miles City, Montana
    Biggest use for a hand vac pump on the 6.5 is for the wastegate actuator, now on gas powered wehicles, many uses for a hand pump on those.
     
    Budd Comeau likes this.
  16. JMJNet

    JMJNet Recruit

    1,950
    126
    May 6, 2008
    Richardson, TX
    I am not sure where you are in TX since TX is bigger than some countries.

    If you have Harbor Freight stores nearby, you can get a vacuum gauge for cheap.
    May not be used for pro but it will be doable for what you want to do.
     
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  17. Budd Comeau

    Budd Comeau New Member

    15
    13
    Jan 11, 2018
    Texas
    If I have faulty OPS how would I check that???

    Sent from my SM-N910V using Tapatalk
     
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  18. ak diesel driver

    ak diesel driver 6.5 driver

    12,363
    2,076
    Feb 7, 2009
    alaska
    you have a 99 so you most likely don't have an OPS issue. But if you start it cold and let the oil pressure come up and then shut it down you should be able to hear the LP running until the oil pressure drops
     
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  19. Budd Comeau

    Budd Comeau New Member

    15
    13
    Jan 11, 2018
    Texas
    It's working OK.

    Sent from my SM-N910V using Tapatalk
     
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