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: check engine light on Duramax wberg 02-09-2004, 07:49 PM error code p5040 2003 gmc sierra duramax. I just started the engine and the check engine light will not go out. I had Onstar do remote diagnostics. They gave me a code of P5040 and I need to know if I reset light. RUMAXED 02-09-2004, 07:58 PM i'm no tech, but i tryed came up blank, sorry Max Power 02-09-2004, 08:03 PM <UL> <LI>If the third digit in your VIN is a "1", your DTC means Infl Rest System Indicator Circuit Malf. <LI>If the third digit is a "2", the DTC means Temp. Gage Data Out of Range </LI>[/list] GMCSID 02-09-2004, 08:14 PM I think you mean p0540. It has to do with the intake air heater circuit. If the ECM detects voltage on the IAH circuit when the relay is commanded OFF, or incorrect voltage when the relay is commanded ON, a DTC will set. wberg 02-09-2004, 09:01 PM your are correct, p0540 is what i meant. Do you know how to reset? wberg 02-10-2004, 02:12 PM Can anyone tell me how reset and get rid of check engine light ? GMCSID 02-10-2004, 07:32 PM You can disconnect the battery for a couple minutes, but if it's a hard code it will reset again. wberg 02-11-2004, 10:19 AM Disconnecting Battiers dis not get rid of check engine light. Will I have to take to Dealers to fix? hoot 02-11-2004, 10:35 AM They often reset themselves in a day. wberg 02-11-2004, 02:44 PM Is there anything to check under the hood ? Does anyone know where this intake heater is? 2MuchFun 02-12-2004, 04:41 PM Geez mr greatful wberg 02-16-2004, 09:15 PM Started truck today and check engine lit went off. I dnt know if light went off because it reset after so many starts or the temperature was warmier? patrick 02-17-2004, 09:55 PM intalk air heater is drilled into the intal tube just before the it branches off into the two banks into the intake | ||