Question about 2003 GMC Sierra

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Need wiring digram from pcm-b fuse to fuel pump 2003 sierra

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need wiring digram from pcm-b fuse to fuel pump - 7c3b9856-c9e5-44ab-9091-d935b4c47cd3.jpg
Hope it helps ..this diagram is for a 2002 could be the same

Posted on Oct 20, 2013

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Posted on Jan 02, 2017

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SOURCE: fuel pump fuse located on 1997 gmc sierra

The fuse is actually a Relay Switch and its located in the Fuse Relay Center on the driverside of the engine compartment. The Black Box is labled Fuse Relay Center, the diagram on the cap displays which Relay is the Fuel Pump relay...the Relay switch is usually $8-$15 depending on where you shop

Posted on Jul 28, 2009

seanpwright
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SOURCE: 1995 sierra 5.7 truck

Was the fuel pressure regulator and relay checked out?

Posted on Sep 15, 2009

  • 1 Answer

SOURCE: wiring diagram 2003 GmC Sierra

I need wiring digram for GMC 2003 SIERRA . I have the left head light working fine but the right I have no power to it. I have checked the fuses and relaysand so far have not found and broken or frayed wires.

Posted on Mar 06, 2010

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1 Answer

I have no power to fuel pump


Are we guessing , could it be the PCM ! We test don't guess . Find a wiring diagram an check , also have a scan tool hooked up to see If the PCM is energizing the fuel pump relay . Or check for control with a test light , Pin A -21 Green with black stripe wire at the PCM will supply a ground to energize the fuel pump relay . You can test with a test light . Videos on youtube , testing computer drivers .

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1999 Gmc Sierra 4.8L cranks/No Start Using snap-on Solus Scanner. I followed basic diagnostics: Checked fuses- good Pulled PCM and BCM codes- none No spark and no fuel. No ignition power to fuel...


Did you check your CKP and CMP power wires for a short to ground? Short to ground up stream might be pulling the voltage low from the PCM. Also.. have you pulled up the underhood fuse block just to see if there's any rodent damage to the wiring under there? That's a pretty common spot for rodents to cause problems.

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Check for 12V on both sides of that 15A fuel pump fuse. The fuel pump relay is ahead of that fuse and it is controlled by the engine controls system. The PPL/BLK wire from the fuse is connected to the powertrain control module (PCM) When the fuel pump relay operates, 12V also passes through the 3A PCM memory fuse (check it) and is applied to the PCM. In addition, there is an inertia fuel shutoff switch (IFS) connected to the PCM and it may have cut off the fuel supply.

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Fuel Gauge quit a few months ago and today 2003 Tahoe cranks will not start no pump sound when you turn key on. Where is the fuse for the fuel pump?


{: ) Check out the PCM B fuse (20amp) and the fuel pump relay both located at the underhood fuseblock.
For dual tanks, additional check for the PCM 1 fuse (15amp) and fuel pump relay secondary at the underhood fuseblock bracket.
Check also maybe the vehicle is in theft mode. The engine may only crank but will not start because the fuel system was disabled.
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Fuel pump only comes on sometimes.


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Wiring diagram 2003 GmC Sierra


I need wiring digram for GMC 2003 SIERRA . I have the left head light working fine but the right I have no power to it. I have checked the fuses and relaysand so far have not found and broken or frayed wires.

May 12, 2009 | 2003 GMC Sierra

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