Service engine light and codes
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Freshman User
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PaysonPSD,
Yes I am in Cali. Are you referring to just checking the conections on the front of the GPCM or are you referring to Chris's write up and how to remove the valve cover and make sure the connections are nice and tight in there? Let me know which one to do or both.
Lee
Yes I am in Cali. Are you referring to just checking the conections on the front of the GPCM or are you referring to Chris's write up and how to remove the valve cover and make sure the connections are nice and tight in there? Let me know which one to do or both.
Lee
Post Fiend
Joined: Nov 2007
Posts: 9,549
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From: Payson, AZ
PaysonPSD,
Yes I am in Cali. Are you referring to just checking the conections on the front of the GPCM or are you referring to Chris's write up and how to remove the valve cover and make sure the connections are nice and tight in there? Let me know which one to do or both.
Lee
Yes I am in Cali. Are you referring to just checking the conections on the front of the GPCM or are you referring to Chris's write up and how to remove the valve cover and make sure the connections are nice and tight in there? Let me know which one to do or both.
Lee
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Posts: 26,966
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From: Texas
For glow plug codes be sure to check the GPCM. I assumed you had read a GPCM thread earlier.
Good catch Robin.
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I see you are in Cali. If you have a Cali truck the GP codes are probably due to a bad GPCM (Glow Plug Control Module) which Cali trucks have instead of a GPR (Glow Plug Relay).
This is a GPCM. Make sure the connectors are tight. One connector for GPs 1,3,5,& 7 and the other for 2,4,6 & 8. When the GPCM goes bad it typically throws codes for all the GPs in one bank or the other.
This is a GPCM. Make sure the connectors are tight. One connector for GPs 1,3,5,& 7 and the other for 2,4,6 & 8. When the GPCM goes bad it typically throws codes for all the GPs in one bank or the other.
Lee
Post Fiend
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From: Payson, AZ
Shop around but this is the best price I know of: GPCM at Riffraff Diesel
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Truck is running just fine. I am not sure if I am suppose to take off the valve covers and check the connections inside and make sure there tight?? or just purchase a new GPCM? And is installng the GPCM pretty easy to install?
Lee
Lee
Cargo Master
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From: Glendive, MT
You could pull the 9 pin connector going into the offending bank and use an ohm meter to check the glow plugs and valve cover harness. The pins are as follows.
GP
GP
INJ
INJ
INJ Common
INJ
INJ
GP
GP
From GP to ground you should have .5-2 ohms.
From INJ Common to INJ you should have somewhere between 3 and 5 ohms, I don't remember exactly. The important thing is that all INJ reading are close to the same.
The GPCM is an easy straight forward fix.
GP
GP
INJ
INJ
INJ Common
INJ
INJ
GP
GP
From GP to ground you should have .5-2 ohms.
From INJ Common to INJ you should have somewhere between 3 and 5 ohms, I don't remember exactly. The important thing is that all INJ reading are close to the same.
The GPCM is an easy straight forward fix.
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ok, I ordered a new GPCM and I am waiting for it to arrive in the mail Now that will hopefully take care of the glow plug codes. I still have the fuel level tank indicator circ error code and water in fuel circ error code. I have drained the fuel bowl multiple times and changed out the fuel flter and reset the codes and drove around for a while and it came back. What should I do next regarding these two codes?? I have to get truck smogged soon and I would like these to be taken care of. ANy advice is appreciated
Lee
Lee
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Cargo Master
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From: Glendive, MT
When you unplug the fuel heater, leave it unplugged. They will not notice it during the smog check. If the WIF code comes back with the heater unplugged, the problem is in the wiring between the plug and ECM. Check where the harness passes over the valve cover on the drivers side. For your fuel level, you will have to follow the wires from the tank up to the cab. If you can't find anything, it may be a problem with the sender itself.
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