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Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), GMC Mechanic
Category: GM
Satisfied Customers: 29522
Experience:  GM Grand Master Technician 2007. 14 years experience.
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I am bill have a 2007 gmc 2500 with code p2671 p0672

Customer Question

hi i am bill have a 2007 gmc 2500 with code p2671 p0672
Submitted: 2 years ago.
Category: GM
Expert:  GM Tech (Cam) replied 2 years ago.
\Welcome. I am Cam. Can you provide your VIN please
Customer: replied 2 years ago.
1gthk23d67f158972
Customer: replied 2 years ago.
you can take your time call me **********
Expert:  GM Tech (Cam) replied 2 years ago.
P0672 indicates a problem with #2 glow plug. Testing involves taking off the wire from the #2, front drivers side and connecting a test light to positive and touch the stud with the end. IF it lights then the glow plug is good and the module or wiring is bad. If the light does not, the glow plug is bad. DTC P2761 Torque Converter Clutch (TCC) Pressure Control Solenoid (PCS) Control Circuit Ope. This means there is a wiring issue,connection issue at the round 20 pin connector on the transmission or transmission control module issue on the fan shroud.
Customer: replied 2 years ago.
i check that cant see any thing i ohm it out
Expert:  GM Tech (Cam) replied 2 years ago.
OK, let me know what you find. And Ohms on the glow plug will be very low, .5 or so, thats why a test light works.
Customer: replied 2 years ago.
i gave the wrong code p0762 shift solenold stuck on and p02671 solenold high control circult group 2 high voltage
Customer: replied 2 years ago.
i change all the solenolds and wires ohm out the harness from trans to tcm all ok but still the code
Customer: replied 2 years ago.
sorry to say but we are not getting any were with problem
Expert:  GM Tech (Cam) replied 2 years ago.
Bill, the second codes has too many numbers in it, it needs a P and 4 numbers only. What are those so we can get this sorted out.
Customer: replied 2 years ago.
ok take your time
Expert:  GM Tech (Cam) replied 2 years ago.
Bill I need you to tell me the proper second code. You have too many numbers in there.
Customer: replied 2 years ago.
p2671
Expert:  GM Tech (Cam) replied 2 years ago.
Ok, so that also is a transmission issues. So once the sole kids have been cleared and the wiring and connection checked, if the issue remains it's a transmission control module issue.
Customer: replied 2 years ago.
i did that too now i am checking the wires with voltage load tester
Expert:  GM Tech (Cam) replied 2 years ago.
Looking deeper, this could very well be the pressure switch manifold inside the transmission bolted to the valve body. This sends feedback data to the transmission module as a feedback from the transmission.
Customer: replied 2 years ago.
did that too
Expert:  GM Tech (Cam) replied 2 years ago.
OK so wiring or the transmission module.
Customer: replied 2 years ago.
? i let you later
Expert:  GM Tech (Cam) replied 2 years ago.
Sure thing. I will not be on line full time for the next few days but I will be checking in often so I Will watch for your updates.