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

  • 2030 Answers

SOURCE: 1995 sierra 5.7 truck

Was the fuel pressure regulator and relay checked out?

Posted on Sep 15, 2009

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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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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 .

Feb 28, 2017 | Cars & Trucks

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2003 ffv 5.3 chev suburban blows pcm 1 fuse with fuel pump ,mass air flow, evaporated purge , and pcm unplugged. Where do I go from here ?

Powertrain Control Module (PCM), Mass Air Flow (MFS) Sensor, Evaporative Emission (EVAP) Canister Purge Solenoid, Fuel Composition Sensor, Secondary Fuel Pump Relay ( with dual tanks)

Mar 23, 2015 | 2003 Chevrolet Suburban

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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.

Oct 03, 2013 | Cars & Trucks

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Car died at stop. turns over, but won't start

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.

Sep 13, 2012 | 1996 Mercury Mystique

2 Answers

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.
Other possible causes could be the pump itself, or the contol signals from the PCM. Let's not forget the fuel, off course. I hope you get lucky.

Jul 08, 2011 | 2003 Chevrolet Tahoe

2 Answers

I have chevy silverado 2003. When my fuel tank is low and the low level fuel light comes on, my pcm fuse blows and truck shuts off going down the freeway. I cant even turn the ignition over unit i...

yes i would say most likely it the fuel pump. it work harder wen u out of gas and may draw too much current blowin the fuse. i looked at wiring diagram and pcm fuse does feed the pump so my educated guess would be replace the fuel pump

Feb 23, 2011 | 2003 Chevrolet Silverado 2500HD

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May 06, 2010 | 1997 Infiniti.5 Q45

3 Answers

Fuel pump only comes on sometimes.

Ford released a SSM (Special Service Message) stating that 2003-2004 Town Car, Grand Marquis and Crown Victoria models may exhibit code P1233 with possible drivability or no start symptoms. It suggests that before replacing a suspect FPDM, fuel pump relay, inertia switch, fuel pump sending unit or PCM, the following things should be checked: Check for a loose PCM pin fit issue. Check for a loose or faulty ground at G101, G103, and G400. Check the FPDM harness located behind the rear seat at the base of the C-pillar for chafed wires on the bracket and check for a circuit or connection issue with the Dark Green/Yellow (DG/YE) wire which runs between the FPDM and PCM pin 40 due to a poor crimp. If all of these items check to be ok, perform normal diagnostics for code P1233.

Jul 18, 2009 | 2003 Mercury Grand Marquis

2 Answers

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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