Instrument cluster illumination issue
Thread Starter
Safety Car
Joined: Aug 2013
Posts: 4,429
Likes: 605
From: Minneapolis Mn
Instrument cluster illumination issue
Still learning the car so bear with me. It's a 2005 Convertible I got in April. Starting about a week ago, get into the car and the instrument cluster is lit up and gauges work. About a week ago, the instrument cluster illumination went dark for a second or two, then came back fine. Each time I drove the car, that dark time got longer each time till it stays dark. Right now when you get into the car the instrument cluster is light up, then as soon as you push the start button, the illumination goes off (gauges still work and have a 'top' not locked error and they are still present). I've looked at all the fuses under the hood, all are good.
I was able to get a scanner on the car today and found 4 issues under the instrument cluster. P0004: Fuel Volume Flow Reg Ctl Circuit high voltage, U1153 Loss of Htg and A/C Comm. U1088 Lost Comm W/Sensing & Diag Module (SDM). U1040 Lost Comm W/Elec Brake Comm Module (EBCM).
Anyone have something like this happen before? I'm still looking up the U1088 but does any of those look suspect on this issue?
Thanks for any ideas you have.
I was able to get a scanner on the car today and found 4 issues under the instrument cluster. P0004: Fuel Volume Flow Reg Ctl Circuit high voltage, U1153 Loss of Htg and A/C Comm. U1088 Lost Comm W/Sensing & Diag Module (SDM). U1040 Lost Comm W/Elec Brake Comm Module (EBCM).
Anyone have something like this happen before? I'm still looking up the U1088 but does any of those look suspect on this issue?
Thanks for any ideas you have.
Le Mans Master
Joined: Dec 2004
Posts: 5,492
Likes: 808
From: West coast CA
Still learning the car so bear with me. It's a 2005 Convertible I got in April. Starting about a week ago, get into the car and the instrument cluster is lit up and gauges work. About a week ago, the instrument cluster illumination went dark for a second or two, then came back fine. Each time I drove the car, that dark time got longer each time till it stays dark. Right now when you get into the car the instrument cluster is light up, then as soon as you push the start button, the illumination goes off (gauges still work and have a 'top' not locked error and they are still present). I've looked at all the fuses under the hood, all are good.
I was able to get a scanner on the car today and found 4 issues under the instrument cluster. P0004: Fuel Volume Flow Reg Ctl Circuit high voltage, U1153 Loss of Htg and A/C Comm. U1088 Lost Comm W/Sensing & Diag Module (SDM). U1040 Lost Comm W/Elec Brake Comm Module (EBCM).
Anyone have something like this happen before? I'm still looking up the U1088 but does any of those look suspect on this issue?
Thanks for any ideas you have.
I was able to get a scanner on the car today and found 4 issues under the instrument cluster. P0004: Fuel Volume Flow Reg Ctl Circuit high voltage, U1153 Loss of Htg and A/C Comm. U1088 Lost Comm W/Sensing & Diag Module (SDM). U1040 Lost Comm W/Elec Brake Comm Module (EBCM).
Anyone have something like this happen before? I'm still looking up the U1088 but does any of those look suspect on this issue?
Thanks for any ideas you have.
Thread Starter
Safety Car
Joined: Aug 2013
Posts: 4,429
Likes: 605
From: Minneapolis Mn
Torquetube
You're onto something! Turning the light control from Auto all the way to the top "Exterior light control" then back to auto and the dash illumination was restored. Not sure how long it will last, but definitely is involved and appreciate it.
I'll still be working on the issues with the car but really appreciate the help. It's on page 3-14 of the owner's manual for those interested.
Thanks again.
You're onto something! Turning the light control from Auto all the way to the top "Exterior light control" then back to auto and the dash illumination was restored. Not sure how long it will last, but definitely is involved and appreciate it.
I'll still be working on the issues with the car but really appreciate the help. It's on page 3-14 of the owner's manual for those interested.
Thanks again.
Thread Starter
Safety Car
Joined: Aug 2013
Posts: 4,429
Likes: 605
From: Minneapolis Mn
Thread Starter
Safety Car
Joined: Aug 2013
Posts: 4,429
Likes: 605
From: Minneapolis Mn
I may not have said it enough, but I really appreciate the members on this website. Always a wealth of information and willing to share it for other car owners. Going from a C4 to a C6 has been quite a change, but I'll hopefully get with it soon.
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,609
Likes: 4,061
From: Cape Coral, Florida
Are these DTC's all history or current ???...your P0004 doesn't look familiar…U1088 is loss of comm with the SDM (airbag module).
Last edited by C5 Diag; Jun 22, 2024 at 08:10 PM.
Thread Starter
Safety Car
Joined: Aug 2013
Posts: 4,429
Likes: 605
From: Minneapolis Mn
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