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Thread: 1995 GMC Sierra, Codes 35 and 36

  1. #1
    Diesel junkie konstan's Avatar
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    Default 1995 GMC Sierra, Codes 35 and 36

    All of a sudden the SES (check engine) light started coming on; it comes on under acceleration; after reaching
    cruising speed of about 50mph it would stay on, but if I let off the accelerator, the light goes away.

    When I got home, I scanned the codes. The codes are 35 and 36.

    The PMD is two weeks old (flight systems, pensacola), mounted inside the fender, on a giant heatsink with a silicon heat transfer pad.

    What can cause it to throw both those codes?
    1995 GMC Sierra 2500 6.5TD - most basic mods done
    1982 Mercedes 300D turbo diesel - rebuilt motor
    1982 Mercedes 240D
    1975 International Farmall 1566 Turbo
    1937 Farmall M (gas)
    1948 Ford 8N (gas)
    Various gasser trucks and even a car (wife's)

  2. #2
    Registered User NVW's Avatar
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    Default

    PMD, grounds, IP or lack of lubricity in the fuel can all cause those codes.

    Add some 2 stroke oil to the fuel at a rate of about 1/100.
    Leo
    * 95 GMC 3500 4x4 dually, VIN "F", 4.10 gears, 4L80/E trans, 405,000km, 3" downpipe, 4" exhaust, FSD mounted on heat sink in bumper, #9 resistor, 3 pillar gauge's, High Idle kit, Bosch marine injectors, Bosch Duraterm glow plugs, Leroy's ATT chip, ATT, GP overide, K47 airbox, FTB, Racor fuel filter, fuel pressure gauge
    * 98 Chev. 1500 4x4 VIN "S", 3.73 gears 250,000 km, (needs work)
    * 97 GMC C3500 VIN "F", 4.10 gears, 5 spd manual, 324,000 k (parts)
    * 04 Yukon Denali, 6.0, 196,000 km.
    * GMTD ScanTech
    * CarCode

  3. #3
    Diesel junkie konstan's Avatar
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    It did start happening right after a fill up. Previous tank was a 2% bio-d, this one i think is just regular ulsd. Gonna go to the coop tomorrow and top off with a few gallons of bio-d. I poured some 2 stroke oil in but I don't have enough.

    Keeping fingers crossed, I hope its bad fuel. Not bad IP.

    No hesitation, stalling or any other running problems.

    If this is indeed due to fuel lubricity - is there going to be long term damage?
    1995 GMC Sierra 2500 6.5TD - most basic mods done
    1982 Mercedes 300D turbo diesel - rebuilt motor
    1982 Mercedes 240D
    1975 International Farmall 1566 Turbo
    1937 Farmall M (gas)
    1948 Ford 8N (gas)
    Various gasser trucks and even a car (wife's)

  4. #4
    Registered User NVW's Avatar
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    Bad fuel could do it too.
    Leo
    * 95 GMC 3500 4x4 dually, VIN "F", 4.10 gears, 4L80/E trans, 405,000km, 3" downpipe, 4" exhaust, FSD mounted on heat sink in bumper, #9 resistor, 3 pillar gauge's, High Idle kit, Bosch marine injectors, Bosch Duraterm glow plugs, Leroy's ATT chip, ATT, GP overide, K47 airbox, FTB, Racor fuel filter, fuel pressure gauge
    * 98 Chev. 1500 4x4 VIN "S", 3.73 gears 250,000 km, (needs work)
    * 97 GMC C3500 VIN "F", 4.10 gears, 5 spd manual, 324,000 k (parts)
    * 04 Yukon Denali, 6.0, 196,000 km.
    * GMTD ScanTech
    * CarCode

  5. #5
    Diesel junkie konstan's Avatar
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    if its bad fuel (hopefully we'll see tomorrow after I top off with 2% bio-d) i am never filling up at that station again.
    Btw, I cleared off the codes, drove it around the field, code 35 came back, code 36 didn't
    1995 GMC Sierra 2500 6.5TD - most basic mods done
    1982 Mercedes 300D turbo diesel - rebuilt motor
    1982 Mercedes 240D
    1975 International Farmall 1566 Turbo
    1937 Farmall M (gas)
    1948 Ford 8N (gas)
    Various gasser trucks and even a car (wife's)

  6. #6
    Diesel Enthusiast
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    Default

    Check the connections on the PMD extension cable also. I was getting them codes when I had a new PMD failure on my Tahoe. Do you have a spare to try?

  7. #7
    Diesel junkie konstan's Avatar
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    Well, the spare is the old one, and it was on its way out - no hot start. I can try plugging it back in the morning.
    I've been meaning to coat the connectors of the extension harness with anti-ox; haven't done that yet. Adding to my to-do list for tomorrow
    1995 GMC Sierra 2500 6.5TD - most basic mods done
    1982 Mercedes 300D turbo diesel - rebuilt motor
    1982 Mercedes 240D
    1975 International Farmall 1566 Turbo
    1937 Farmall M (gas)
    1948 Ford 8N (gas)
    Various gasser trucks and even a car (wife's)

  8. #8
    Diesel Enthusiast
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    Google search stanadyne dealers in yr local area. I purchase used PMD's from the one here by me for a backup PMD. The dealer here sells them for 50 bucs with a no questions asked 2 week replacement. I buy em run for a couple weeks & then place that one in my glove box on a small computer like heat sink with some zip ties for a spare. No 6.5 should be without a spare PMD IMHO.

  9. #9
    Well it hits on 7 of 8... WarWagon's Avatar
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    Open the water drain and check to see what comes out in a glass jar. Settle it and make sure you don't have a slug of water. Make sure you don't have bad fuel before pushing it further.
    Not enough room in sig for all the stuff I have that LeroyDiesel.com sells.

    2003 Dodge Ram 3500 SLT QC LB HO Cummins 6 speed handshaker w/ Pacbrake. Factory 3rd pedal anti theft.

    1993 Chevy "Patch" K2500 6.5 Diesel LB project beater... Now a 6.2 re-power w/6.5 NA heads. Gapless rings. Walbro FRB-5. A-Team Turbo. ARP head studs. 6 banger Trans tune chip I think I have changed, replaced, or tightened every bolt and nut on this thing!

  10. #10
    Registered User gnel's Avatar
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    My Sub was throwing those codes before the IP died. Have a lot of miles on your IP ?
    2010 Nissan Rogue (wifes new ride)
    1995 Chevrolet Suburban 2500 4x4 T/D 219,000 miles,desnokeled,oil cooler kit,H/O water pump,bumper mounted PMD,Bosch injectors,timing chain kit,both balancers,ac60g glow plugs.4in diamond eye exhaust,k47airbox,duramax cooling fan upgrade,OPS extension,IP redo,
    1984 GMC Suburban 1500 4x4 6.2 N/A 321,000 miles, rebuilt IP and injectors, electric lift pump,timing chain , harmonic balancer, SOLD
    2001 VW Jetta TDI 115,000 miles,100,000 mile timing belt kit, 42 mpg average (makes up for the sub)
    1982 VW Bocho/Bug class 11 mileage unknown,cut and turned front, reindexed rear torsion bars.
    1973 VW Safari/Thing my new toy

  11. #11
    Recruit JMJNet's Avatar
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    If you suspect of getting bad fuel, change the fuel filter and have a couple more spare.
    #####---------######-------#####
    1995 6.5TD GMC Suburban
    PMD in Bumper
    4" Warpspeed Exhaust
    KD LP/OPS Harness
    Bosch Duraterm GP
    Heath Turbo-Master
    Chevron's XLP Diesel Additive

  12. #12
    Diesel junkie konstan's Avatar
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    Ok, so, I think its the PMD. Here is why:

    Hooked up the pump connector directly to my spare PMD, drove around. NO codes, NO SES light.
    Hooked up the pump connector directly to the suspect PMD. Got the code and the SES lights.
    Both of these times there was NO extension harness in the circuit; PMDs

    Gonna try to get Pensacola to send me a replacement...
    1995 GMC Sierra 2500 6.5TD - most basic mods done
    1982 Mercedes 300D turbo diesel - rebuilt motor
    1982 Mercedes 240D
    1975 International Farmall 1566 Turbo
    1937 Farmall M (gas)
    1948 Ford 8N (gas)
    Various gasser trucks and even a car (wife's)

  13. #13
    Registered User buddy's Avatar
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    It would be very good to have GMTDScan or other scanner to read the injection pulse width. The code happens when it take more time or less time than it should for the fuel metering valve within the IP's fuel solenoid to seat once the PCM removes voltage. The PMD takes the pulse width modulated signal from the PCM and switched high power to the IP's fuel solenoid to close the metering valve and open it and close it and open it VERY quickly. A faulty PMD may cause the power to drop off too quick (DTC35) or too late (DTC36). Or the IP can be failing and lubrication can help. In that scenario the valve may not be fully closing so it seats too quick, or it may get stick or slow down and seat too late. There is a tolerance of like 1ms to 2.3ms. So its a very fast thing.

    The IP could be on the edge and a PMD that really is fine might set it off, or a faulty PMD combined with worn IP may actually allow it to work right. without the scanner info its hard to say, but its certainly a good chance that the PMD is causing it.

    Remember to always lubrciate the fuel to prevent the IP from becoming the issue.
    94 6.5TD C1500 ECLB w/ 50 gallon aux tank/box; 235/75R17 tires on Alloy wheels; 3.42 gears; A-Team Turbo; 4" Aero Turbine 4040 muffler to 5" Aero Turbine 5050XL muffler to 6" tip before rear axle; FSD heatsink, marine injectors; "F" intake; SynBlend 10W-30 oil; Walbro FRB-5 w/ 12 micron prefilter; Feed The Beast; WMI and Propane fumigation; OPS extension & relay; 110K original miles; Engh GMTDScanTech
    Near Future: Battery relocation, Amsoil Nanofilter behind headlight, and stereo upgrades
    Veterans of America Club, member #18

  14. #14
    Recruit JMJNet's Avatar
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    He used 2% BioDiesel. I would think that is good lubrication. Just as long as the filter does not get clogged.
    Unless the BioDiesel is bad also and causes the IP to be on the edge.
    #####---------######-------#####
    1995 6.5TD GMC Suburban
    PMD in Bumper
    4" Warpspeed Exhaust
    KD LP/OPS Harness
    Bosch Duraterm GP
    Heath Turbo-Master
    Chevron's XLP Diesel Additive

  15. #15
    Diesel junkie konstan's Avatar
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    The fail code (SES) behavior is very consistent.
    With the suspect PMD plugged in:

    In park, idling, no code. Rev it up to about 2000 rpm, the code appears. Let it fall back to 700 rpm, code disappears.
    When driving, as soon as rpm reach about 1400, the code appears. Let it drop to below 1000 rpm, code disappears.
    Consistently, each and every time.

    With the spare PMD, no codes.
    1995 GMC Sierra 2500 6.5TD - most basic mods done
    1982 Mercedes 300D turbo diesel - rebuilt motor
    1982 Mercedes 240D
    1975 International Farmall 1566 Turbo
    1937 Farmall M (gas)
    1948 Ford 8N (gas)
    Various gasser trucks and even a car (wife's)

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