2001 C5, possible fried PCM
Thread Starter
Instructor
Joined: Sep 2005
Posts: 205
Likes: 0
From: Bay Area CA
Just a little update since I had some time to look at the car today. The fuel pump is still not priming on it's own. With the jumper and pump priming, it still won't start. There's fuel pressure(fuel shooting out the schrader valve) and there's spark, but no dice.
The ground wire at the engine block is tight like a mother. All grounds are nice and clean, no corrosion at all(CA car). We even added about 3-4 gallons of gas today thinking maybe the right tank is not pumping fuel over.
It's definitely something electrical that's for sure.
The ground wire at the engine block is tight like a mother. All grounds are nice and clean, no corrosion at all(CA car). We even added about 3-4 gallons of gas today thinking maybe the right tank is not pumping fuel over.
It's definitely something electrical that's for sure.
Thread Starter
Instructor
Joined: Sep 2005
Posts: 205
Likes: 0
From: Bay Area CA
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 have a corrupted serial data line OR your BCM is wet and or corroded.
Until you figure out whats going on with the serial data communications,, IT DONE, Stick a fork in it. Start with a BCM check. Is the rug or underlayment damp or wet?
Open the silver box and examine the circuit board. Is it corroded??
If you pop off the four wire serial data STAR BUS cap, does the issue go away?
BC
Until you figure out whats going on with the serial data communications,, IT DONE, Stick a fork in it. Start with a BCM check. Is the rug or underlayment damp or wet?
Open the silver box and examine the circuit board. Is it corroded??
If you pop off the four wire serial data STAR BUS cap, does the issue go away?
BC
Thread Starter
Instructor
Joined: Sep 2005
Posts: 205
Likes: 0
From: Bay Area CA
You have a corrupted serial data line OR your BCM is wet and or corroded.
Until you figure out whats going on with the serial data communications,, IT DONE, Stick a fork in it. Start with a BCM check. Is the rug or underlayment damp or wet?
Open the silver box and examine the circuit board. Is it corroded??
If you pop off the four wire serial data STAR BUS cap, does the issue go away?
BC
Until you figure out whats going on with the serial data communications,, IT DONE, Stick a fork in it. Start with a BCM check. Is the rug or underlayment damp or wet?
Open the silver box and examine the circuit board. Is it corroded??
If you pop off the four wire serial data STAR BUS cap, does the issue go away?
BC
I opened up the BCM and noticed some residue. It's dried to the touch and wiped away like white powder.
I wiped it down, plugged it back in and we're getting the same results. "NO COMM" on all modules and the pump is still not priming on its own.
I don't know much about circuit boards, but is the white residue a tell tale sign of something bad.
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
Your BCM has been wetted (probably more than one time) and that residue is minerals from the water when it evaporated. The WHITE DEPOSITS can and will cause issues. Use a soft nylon brush and some alcohol and rid the board and components of the residue. Blow the board down with air. Make sure that the deposits are removed from under ALL the components!!
The BCM has numerous B+ and Hot in run and start fuses. Check each one. Pull the fuse, inspect for corrosion and continuity and proper fuse holder grip on the fuse lugs.
BC
The BCM has numerous B+ and Hot in run and start fuses. Check each one. Pull the fuse, inspect for corrosion and continuity and proper fuse holder grip on the fuse lugs.
BC
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Thread Starter
Instructor
Joined: Sep 2005
Posts: 205
Likes: 0
From: Bay Area CA
The codes finally popped up today, very weird.
PCM - NO COMM
TCS
C1276 H
U1016 H
U1000 H C
BCM
B2527 H
U1255 H C
U1096 H
U1016 H
SDM
U1000 H C
U1096 H
U1064 H
U1040 H
U1176 H
IPC
U1176 H
RADIO
U1096 H C
HVAC
U1064 H
U1096 H
U1160 H
U1255 H
LDCM
B2206 H
B2282 H
B2284 H
U1255 H
U1064 H
U1016 H
U1096 H
RDCM
B2283 H
B2285 H
U1255 H
U1064 H
U1016 H
U1096 H
SCM
U1255 H
U1160 H
U1064 H
RFA
U1000 H C
U1255 H
U1064 H
U1095 H
U1016 H
PCM - NO COMM
TCS
C1276 H
U1016 H
U1000 H C
BCM
B2527 H
U1255 H C
U1096 H
U1016 H
SDM
U1000 H C
U1096 H
U1064 H
U1040 H
U1176 H
IPC
U1176 H
RADIO
U1096 H C
HVAC
U1064 H
U1096 H
U1160 H
U1255 H
LDCM
B2206 H
B2282 H
B2284 H
U1255 H
U1064 H
U1016 H
U1096 H
RDCM
B2283 H
B2285 H
U1255 H
U1064 H
U1016 H
U1096 H
SCM
U1255 H
U1160 H
U1064 H
RFA
U1000 H C
U1255 H
U1064 H
U1095 H
U1016 H
Cruising
Joined: Aug 2013
Posts: 13
Likes: 0
From: Fort Worth TX
Just bought a 2000 one week ago and having similar issues. Get in turn key and no fuel pump prime. Turn off and back on then pump comes on fuel pressure gage reads 65psi and all is good for a couple of days then fuel pump quits while driving down the road. Tow it home put key in and pump comes on fires right up. Scared to drive it now. I checked ground connectors found no corrosion. Ordered service manuals yesterday. Have'nt checked codes yet will do that tonight.
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
Examine the fuel pump schematic and look where the fuel pump power comes from:
My guess, your ignition switch is dirty/burnt.
You can clean it for free:
- C5 ignition Switch repair - http://forums.corvetteforum.com/c5-t...ch-repair.html
OR
The relay is going bad.
BC
My guess, your ignition switch is dirty/burnt.
You can clean it for free:
- C5 ignition Switch repair - http://forums.corvetteforum.com/c5-t...ch-repair.html
OR
The relay is going bad.
BC
Last edited by Bill Curlee; Aug 14, 2013 at 11:11 PM.
Cruising
Joined: Aug 2013
Posts: 13
Likes: 0
From: Fort Worth TX
Thanks Bill nice write up. I just rebuilt steering column on a 97 F350. Not looking forward to disassembling corvette dash but sure seems like the culprit. Ordered service manuals but have not received yet.
This is my first corvette and so far she's lived up to the reputation that nothing is easy to get to
This is my first corvette and so far she's lived up to the reputation that nothing is easy to get to
