CEL: Fuel pump relay
Thread Starter
Cruising
Joined: Aug 2010
Posts: 13
Likes: 0
CEL: Fuel pump relay
Hey guys,
The vette had been stored for around 4 months, when I turned the key on I couldn't hear the fuel pump and fuel pressure reads 0.
I have the CEL on & when checked for DTCs, found one of them is related to "Fuel pump relay"
I wired it directly and drove to the mechanic, after several attempts trying to track down the issue, he said that the relay is not getting a signal from the BCM
and the problem could be with the wire feeding the relay, or worse the BCM itself!!
Any one have an idea about this?
The vette had been stored for around 4 months, when I turned the key on I couldn't hear the fuel pump and fuel pressure reads 0.
I have the CEL on & when checked for DTCs, found one of them is related to "Fuel pump relay"
I wired it directly and drove to the mechanic, after several attempts trying to track down the issue, he said that the relay is not getting a signal from the BCM
and the problem could be with the wire feeding the relay, or worse the BCM itself!!
Any one have an idea about this?
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
You need to find a mechanic that understands Corvettes and how they really work.
- For starters ,,,,, what DTC do you have???
- Have you tried to clear it????
How are you reading the DTC's??
Like this:
You don’t need no stinking predator to read and clear DTCs
The DTC that you have is actually: Traction Control Torque Request Circuit and frequently happens when some other EBTCM or BCM error DTC is present. That predator wont show you ALL the BCM or EBTCM DTC.
Try this. Its more accurate and easier.
READING YOUR Engine Diagnostic Trouble Codes (DTC)
This procedure should be carried out any time you experience a problem with your C5. Most inexpensive store bought aftermarket code readers will ONLY read power train DTC’s. Reading the DTC’s with the C5 built in code reader will allow you to read ALL the modules in the vehicle.
NOTE!! If the BCM is having a security issue,,,it will NOT allow the fuel pump to run!
So,,,yep,, the BCM is causing you issue. Cause it's DESIGNED that way!
Before you get head deep into your bank account and throw expensive parts at the car, you need to dig a little deeper in the actual issue causing the car to be unhappy.
BC
- For starters ,,,,, what DTC do you have???
- Have you tried to clear it????
How are you reading the DTC's??
Like this:
You don’t need no stinking predator to read and clear DTCs
The DTC that you have is actually: Traction Control Torque Request Circuit and frequently happens when some other EBTCM or BCM error DTC is present. That predator wont show you ALL the BCM or EBTCM DTC.
Try this. Its more accurate and easier.
READING YOUR Engine Diagnostic Trouble Codes (DTC)
This procedure should be carried out any time you experience a problem with your C5. Most inexpensive store bought aftermarket code readers will ONLY read power train DTC’s. Reading the DTC’s with the C5 built in code reader will allow you to read ALL the modules in the vehicle.
NOTE!! If the BCM is having a security issue,,,it will NOT allow the fuel pump to run!
So,,,yep,, the BCM is causing you issue. Cause it's DESIGNED that way!Before you get head deep into your bank account and throw expensive parts at the car, you need to dig a little deeper in the actual issue causing the car to be unhappy.
BC
Thread Starter
Cruising
Joined: Aug 2010
Posts: 13
Likes: 0
Hi Bill,
Thanks for stepping in and my apology for the late reply.
A mechanic that understands Corvettes = Stealership
? I do always use the onboard trouble code reader along with HPtuners to see what's going on with my vette. I cleared all DTC's and here are what came back:
Both P0103 and C1241 came after I installed the Novi (running mafless)
but the P0230 is the most recent and came up after 4 months of storage
Thanks for stepping in and my apology for the late reply.
A mechanic that understands Corvettes = Stealership
? I do always use the onboard trouble code reader along with HPtuners to see what's going on with my vette. I cleared all DTC's and here are what came back:Both P0103 and C1241 came after I installed the Novi (running mafless)
but the P0230 is the most recent and came up after 4 months of storage
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
BC
Thread Starter
Cruising
Joined: Aug 2010
Posts: 13
Likes: 0
Update:
I went for a drive today morning and I reset all the DTCs while both driving and with the engine off (more than 5 resets)
The C1255 and U1064 got cleared away successfully but the others kept coming back.
I went for a drive today morning and I reset all the DTCs while both driving and with the engine off (more than 5 resets)
The C1255 and U1064 got cleared away successfully but the others kept coming back.
Thread Starter
Cruising
Joined: Aug 2010
Posts: 13
Likes: 0
Update:
Had some time off so I decided to check\clean the grounds and to my surprise the G 104 was bent and looked like it was broken:
I thought it would break off if touched but it didn't, so I removed the bolt, cleaned it out and straightened the ground stud and put everything back in and tightened it and it held well
Now got 2 new DTC's for both front and rear knock sensors!
P0332 HC
P0327 HC
In addition to:
P0103 HC
P0230 HC
C1241 C
C1286 C
Any Idea?
Had some time off so I decided to check\clean the grounds and to my surprise the G 104 was bent and looked like it was broken:
I thought it would break off if touched but it didn't, so I removed the bolt, cleaned it out and straightened the ground stud and put everything back in and tightened it and it held well
Now got 2 new DTC's for both front and rear knock sensors!
P0332 HC
P0327 HC
In addition to:
P0103 HC
P0230 HC
C1241 C
C1286 C
Any Idea?
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Tech Contributor
Joined: Jan 2007
Posts: 19,454
Likes: 1,161
From: Dyer, IN
Hey guys,
The vette had been stored for around 4 months, when I turned the key on I couldn't hear the fuel pump and fuel pressure reads 0.
I have the CEL on & when checked for DTCs, found one of them is related to "Fuel pump relay"
I wired it directly and drove to the mechanic, after several attempts trying to track down the issue, he said that the relay is not getting a signal from the BCM
The vette had been stored for around 4 months, when I turned the key on I couldn't hear the fuel pump and fuel pressure reads 0.
I have the CEL on & when checked for DTCs, found one of them is related to "Fuel pump relay"
I wired it directly and drove to the mechanic, after several attempts trying to track down the issue, he said that the relay is not getting a signal from the BCM
The fuel pump relay has nothing to do with the BCM. The PCM controls the fuel pump relay, as it supplies 12 volts to the relay in two ways: 1) Key to on, pump will run for 2 seconds if no engine rotation is sensed from the crankshaft sensor.
2) Normal starting, engine rotation is sensed, and 12 volts to the relay is maintained.
The BCM does communicate with the PCM, as it relates to starting the engine, over the class 2 serial buss. If the correct message is sent from the BCM to the PCM, indicating that a security issue does not exist, the PCM enables the fuel injectors. If a security issue exists, the PCM will disable the fuel injectors.....not the fuel pump.
No offense, but that has to be the filthiest frame I have ever seen. Has this vehicle been in a junkyard, wrecked, etc? If that's the way the whole battery compartment looks, I would be inspecting splice pack 122, G105/106, and the PCM wiring as well.
http://forums.corvetteforum.com/c5-t...e-grounds.html
Last edited by lucky131969; Sep 20, 2010 at 09:40 AM.
