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2017 Silverado with P018B and P2635 Codes

silverbirchmetallic

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silverbirchmetallic Enthusiast

silverbirchmetallic

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I have a 2017 Silverado LS 4x4 Double Cab with 5.3L engine and 26k miles. The CEL lit up yesterday, and my Bluetooth scanner shows P018B and P2635 codes. I have monitored a few PIDs, and it appears that "Commanded fuel rail pressure B" is showing zero, although the "Fuel rail pressure B" is similar to "Fuel rail pressure A". I'd like to trace the command signal wire. This problem started right after I washed my truck at a touchless car wash that had an under carriage spray. Would anyone have a wiring diagram? I saw a link on this site for "http://www.gmupfitter.com/files/media/photo/578/Sierra_Silverado_Electrical_Body_Builders_Manual_Service_Manual_2015_en_US.pdf" , but it is no longer available. Open to any suggestions or ideas on what the problem is. The truck starts and runs like new with absolutely no issues. Thanks!

BO TIE 1 Enthusiast

BO TIE 1

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If it's running good maybe just try clearing the codes to see if they come back.

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silverbirchmetallic Enthusiast

silverbirchmetallic

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Thanks to silveradosid I was able to trace all the wiring. I couldn't find any broken wires, so I took it to the dealer. The dealer said everything "passed" and cleared the DTC. They test drove it and could not duplicate the failure. I'm not sure where to go from here. I have Googled similar problems that were due to a bad battery. My batt is reading 13.3V to 14.7V at the scanner. No idea if this is good or bad--batt is about 3.5 to 4 years old. 

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      On the PCM side, blue PCM connector, pin 18, solid gray color (no stripe) wire circuit 435.  That is the EGR low circuit which an issue on that line (be it the wiring, the PCM or the EGR valve or system performance) will trigger P0401 when it tests that code.     There is also a VERY old TSB that states to make sure you clear the DTCs ANY time the PCM is unplugged, reprogrammed, or if the EGR valve is unplugged or replaced as the PCM has an auto zero function in the PCM for the EGR pintle data   61-65-59: SMU - SECTION 6E - ENGINE CONTROLS - CLEAR DTC'S - (Nov 25, 1996)   "CLEAR ANY DTCS FROM THE VCM ANYTIME AFTER DOING VCM REPLACEMENT/ PROGRAMMING, TURNING THE IGNITION ON WHILE THE EGR VALVE IS DISCONNECTED, OR REPLACING THE EGR VALVE."   Some diagnostic aid notes in the GM diag on P0401 for a 1995 S10 Blazer:   Diagnostic Aids Notice: In order to prevent further damage if the EGR valve shows signs of excessive heat, check the exhaust system for blockage (possibly a plugged converter) using the procedure found on the restricted exhaust system check. If the exhaust system is restricted, repair the cause; one of which might be an injector which is open due to one of the following reasons: Stuck Grounded driver circuit Check the oil for possible fuel contamination if a stuck open fuel injector is found. Poor connection or damaged harness - Inspect VCM harness connectors for the following conditions: Backed out terminal BL 18 Improper mating Broken locks Improperly formed or damaged terminal Poor terminal to wire connection Damaged harness Intermittent test - If connections and harness check OK, monitor a digital voltmeter connected between terminal BL 18 and ground while moving related connectors and wiring harness. If the failure is induced, the voltage reading will change.

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