GM Repair Problems? Ask GM Repair Expert Now.
Hi my name is ***** ***** would like to assist you. So you have no power at the fuel pump fuse in the underhood fuse box?
so you have power at a relay spot and you are saying it does not have a relay in it?
this is the diagram to your truck double check to make sure it is correct. If it there is no power at the fuel pump fuse or relay. I would inspect under the fuse box by removing it and looking for corroded green wires.
no not on this vehicle it should be underhood fuse box
find the relay?
so getting a code for fuel pump circuit?
well if that relay is missing then it will be an open circuit. According to your diagram for your vehicle there should be a relay there.
if you were positive that there was never a relay there that is odd because that vehicle should have a fuel pump relay that the pcm closes to send power to the pump when the key is turned to on position. It should click and power the pump up for 2 seconds to prime the system and keep it energized while the truck is running.
need to remove that fuse box and see if it is corroded underneath make sure there is no green corroded terminals on the connectors or the box. I am beginning to think that fuse box is bad or there is no crank signal to pcm.
what is the dtc p0230 or p0231
alright only think i can think of is check for corrossion at your fuel pump control module. If corrossion is present will need to repair harness and replace module. Module could just be faulty as well have attached pic of module.
if the ignition switch was bad other things would not be getting power as well
there has to be a fuel pump relay missing that code is for the pcm not seeing the voltage on the relay.
Hi there. Different expert here.
The reason why you can't find a traditional fuel pump relay on your truck is because it does not exist (see attached diagram). Your Avalanche is equipped with a fuel pressure control module or FPCM (mounted to the left side of the frame assembly, below the driver's seat) that the onboard computer (ECM) uses to activate the fuel pump on a duty-cycle basis instead of the traditional On and OFF mode of operation.
DTC P025A sets when the FPCM detects a fault on the fuel control enable signal and it is mostly caused by a bad FPCM. I'be happy to guide you through the diagnostic procedures, just be aware that you'll need to use a capable scan tool and multimeter.
Looks like it. There is a recall out on those:
Vehicle Make / Model: 2009 CHEVROLET / COLORADO 2009 GMC / CANYONNHTSA Campaign ID Number: 09V154000Summary: GM IS RECALLING 27,188 MY 2009 CADILLAC ESCALADE, ESCALADE HYBRID, ESCALADE ESV, AND ESCALADE EXT; CHEVROLET AVALANCHE, SUBURBAN, TAHOE, TAHOE HYBRID, AND COLORADO; AND GMC YUKON, YUKON HYBRID, YUKON XL, AND CANYON VEHICLES. THE FUEL SYSTEM CONTROL MODULES MAY HAVE A CONDITION IN WHICH AN ADHESIVE SEPARATION OF THE ROOM TEMPERATURE VULCANIZING (RTV) SEAL BETWEEN THE SEAL AND THE HOUSING MAY ALLOW WATER TO SEEP INTO THE MODULE.Consequence: WATER IN THE MODULE COULD CAUSE A SHORT OR OPEN CIRCUIT, ILLUMINATION OF THE SERVICE ENGINE SOON LAMP, SETTING OF DIAGNOSTIC TROUBLE CODES OR THE ENGINE MAY BE HARD TO START, MAY NOT START OR MAY STALL INCREASING THE RISK OF A CRASH.Remedy: DEALERS WILL INSTALL A NEW FUEL SYSTEM CONTROL MODULE FREE OF CHARGE. THE RECALL BEGAN ON MAY 18, 2009. OWNERS MAY CONTACT CADILLAC AT 1-***-***-****, CHEVROLET AT 1-***-***-**** AND GMC AT 1-***-***-**** OR AT GM Owners Center - GM.Notes: GM RECALL NO. 08411. OWNERS MAY ALSO CONTACT THE NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATION'S VEHICLE SAFETY HOTLINE AT 1-***-***-**** (TTY 1-***-***-****), OR GO TO HTTP://WWW.SAFERCAR.GOV .
The attached pic shows where the FPCM is mounted under the truck.
They go by VIN and production date - were this my truck, I'd give them a call...
I hope they take care of it for you.
Other than the usual R&R, the only other process needed is programming; upon installing the new FPCM, the PCM will set code P0602 and the pump won't run until the new module is programmed - as with any new module, the FPCM will need to be programmed using GM's Service Programming System with the latest calibration available on TIS2WEB through either a Tech-II or the multiple diagnostic interface (MDI) loaded with the latest software.