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BOBBYSS
BOBBYSS, Master Technician
Category: Chevy
Satisfied Customers: 17143
Experience:  ASE MASTER CERTIFIED, AA DEGREE AUTO/DIESEL TECH
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Check gauge light comes on uphill wot, 2007 chevy duramax

Customer Question

check gauge light comes on uphill wot
JA: Just to clarify, what are the exact lights you're talking about?
Customer: 2007 chevy duramax 6.6L diesel. yellow gauge symbol w/buzzer
JA: What is the model of your '07 Chevy?
Customer: 5500
JA: Are you fixing your vehicle yourself? What have you tried so far?
Customer: yes. we replace fuel injectors and pump
JA: Anything else you want the mechanic to know before I connect you?
Customer: only comes on at WOT uphill
Submitted: 1 month ago.
Category: Chevy
Expert:  BOBBYSS replied 1 month ago.

Hello, my name is***** you tell me which gauge is low causing the light to come on?

Customer: replied 1 month ago.
my coolant temp at about 208 and oil pressure is about 40psi. RPM about 22-2500 uphill only. No check engine lamps comes on.
Customer: replied 1 month ago.
FYI new fuel pressure pump/high pressure relief valve/injectors. In a matter of fact engine was replaced back in 2008.
Expert:  BOBBYSS replied 1 month ago.

Thanks. So the check gauges light is coming on but all of the gauges still read fine.

Customer: replied 1 month ago.
thats correct
Customer: replied 1 month ago.
but it does shut down it registered as a low oil pressure count on the Engine shutdown parameter using tech 2
Expert:  BOBBYSS replied 1 month ago.

If it registered low oil pressure then I would test the oil pressure sensor or replace it. Does the oil pressure on the gauge match what the TECH II reads?

Customer: replied 1 month ago.
Expert:  BOBBYSS replied 1 month ago.

Thank you. If it registered low oil pressure and turned on the light then you may have a bad oil pressure sensor or an issue with the hydraulic system. I would start by making sure that the oil is fresh and that the oil filter is good. I have had oil filter clog internally and cause this. I have also seen poor connections on the negative battery cable cause this also.

Customer: replied 1 month ago.
did replace oil and filter, same result. I havent replace the oil pressure sensor yet. did try look for it but couldnt find it.
At one time test driving it notice ignition voltage drops to 12.6V. and back up to 13.1V. Does this cause the check gauge lamp to comes on only at high RPM.
Expert:  BOBBYSS replied 1 month ago.

If the voltage in the system is low enough then this will occur. This can occur if there is a bad connection at one of the battery cables or more commonly a bad ignition switch.

Customer: replied 1 month ago.
basiclly just change the oil pressure sensor first, but where is the location
Expert:  BOBBYSS replied 1 month ago.

It is located on the driver side of the engine block.

Customer: replied 1 month ago.
is that the sender for oil pressure to the gauge or its the same
Expert:  BOBBYSS replied 1 month ago.

The oil pressure sensor on this engine sends it information to the computer who sends it to the gauge.

Customer: replied 27 days ago.
did replace sensor and check battery terminals. same result dies out uphill.

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