First_C5

Proud owner of my first Corvette. It's a 2004 C5 that I bought for my wife for our 20th. It's got around 40k miles on it, 20k of that she's put on in the last three years. At one point, we apparently had a rat take up residence in the engine bay, and eat some of the wiring. The issue that time was one of the sensors in the automatic tranny stopped functioning. I tried replacing it with no change, and then checked connectivity on the wires and noticed some open circuits. To fix it I ran new wires (couldn't find a harness and was scared to find out how much to install one) from the PCM ( I think that's it) behind the passenger front tire back along the tunnel to the sensor. Issue fixed move on.

Not long ago, the DIC started displaying messages to service the ABS, Traction Control, and Stability Control systems.

After reading on here, I cleaned all of the grounds I could find, and they really didn't look bad to start with. No improvement. I also found where the rat had chewed through some of the wiring harness and repaired all of the broken wires there.

I read through the service manual that I downloaded, and did what I had the skills/tools to in investigating the issue. The two main codes that I've seen multiple times are C1284/C1285. I check the voltages on the lateral acceleration sensor and it all looked correct.

I finally decided that I had reached the end of my skill set and took it to a corvette specialist nearby in the Dallas area. They had the car for almost a month (long story about serious communication issues within that company - I'm not going to name names of who they are in this post, but if anyone is interested in the drama I'll respond via PM).

They are started with replacing the lateral acceleration sensor and sent off the EBCM to absfixer for a rebuild/replacement, not sure which it was.

When I received the car back, the ABS/TCS/etc codes were gone, as well as about a grand of cash. But hey, I'm happy that part is fixed. They didn't fix the external temp stuck at 69, but I'll deal with that later.

Well, the wife took for a road trip to see family and within 300 miles all the codes were back. They've been on since. Also, since then the AC has stopped blowing cold air, not sure if the compressor has finally given up (bad noises when it kicked in previously), or if it's related to the temp sensor, I've seen some references to that being a possibility.

Today I decided to replace the temp sensor to see if that will help the AC start back up and get through a few months at least before I drop it off at the dealer to have that replaced. While up on the jack stands I figure I'll look at the wheel speed sensors as that seems to also be a possible culprit.

I cleared all codes, and drove the car for a short drive and checked them again before turning it off. Here are the codes I've got as of then.

C1265 H C
C1284 H C
C1285 H C

B0333 H C
B0361 H

I've replaced the temp sensor, but haven't checked on the status of the code for it yet, will do that when it gets slightly less warm outside this afternoon. But now the external temp displays as -40 (after doing the temp restart on the controls - front defrost, rear defrost, up fan concurrently).

All four wheel speed sensors look fine, no corrosion, the pins don't look bent back to far, etc. Haven't found how to test connectivity on those yet in the manuals.

The diagnostic process in the manuals tells me to replace the lateral sensor again. I find it difficult to believe I've had one fail and the replacement fail that soon.

Hopefully someone out there can give me some pointers on where to go next, short of dropping it off at the dealer with a blank check.

Thanks in advance.

Joe

NITRO UK

Pita mate, there are some great guys on here I'm sure can help , I'm still learning
Thought this May help save time getting code info in the future .

http://www.digitalcorvettes.com/foru...d.php?p=512062

First_C5

Update:

Put the car back together, what little part I've taken apart today. AC now won't even blow cold. When I started it up after setting it was back on 69, I did the reset thing again, and it went to -41, and then started slowly climbing upward, while the AC/Heat wouldn't blow anything. I assume it'll end up back at 69 again.

As far as code, after another quick test drive, here is what I've got.

Again, any assistance or pointers appreciated.

C1265 HC
C1281 HC
C1284 HC
C1285 HC

B0333 HC - I'm now assuming I've got wiring damage between the computer system and the sensor.
B0361 H
B0441 H

B2860 H

First_C5

Walking through all of those codes now, I see.

C1265 LR Inlet Valve Solenoid Malfunction
I believe this is from the EBCM, correct? Reporting an issue with the BPMV? Could all of this be related to the BPMV being bad?

C1281 Steering Sensor Uncorrelated Malfunction
This seems to point to my earlier thought about the steering wheel position sensor being the cause. I think I read somewhere that it is on the same circuit as the lateral sensor? Wiring problem affecting both? Or could the steering sensor be causing an issue that the computer reports is the lateral sensor?

C1284 Lateral Accelerometer Sensor Self Test Malfunction
C1285 Lateral Accelerometer Sensor Circuit Malfunction

I've been fighting these two all along, through two sensors now.

B0333 Outside Air Temperature Sensor Open
Looks like I've got a wiring problem somewhere.
B0361 Left Actuator Feedback Short to GND
B0441 Also related to the left actuator

B2860 Telescoping Column Position Sensor Failure
Back to the steering column potential.

Unless someone has alternative ideas, looks like the next item is to replace the steering sensor. I looked under the hood to get an idea if it was something I wanted to tackle, and couldn't find the one bolt to do under the hood where I thought it would be. Based on what I had read online, I thought the location to unhook it would be near the firewall, but I couldn't see one at all (of course the brake booster was blocking most of the vision). But I did see one closer to the front end that would be much easier to undo, but don't want to unhook the wrong one and end up having to tow it somewhere to fix my repair ;-)
So I need some guidance there before I decide to tackle it myself or just drop it off at the dealer.


Thanks in advance. Again.

NITRO UK

Hi , the steering wheel position sensor is located at the bottom of the column .Some wires do go to the ebcm , la sensor .

I would check the large harness on the passenger side frame , by the battery and coolant recovery tank and all the way round to the ebcm , also goes to the magnasteer connection on the steering rack.

$$ saved if you find any chewed wires, I would check as much wiring for damage as you can .

0Anthony @ LGMotorsports

It would have to be done with a Tech II or similar tool, but try and reset the Steering position sensor and see if it will re-zero itself. Might be a comparison between that and the Lat. sensor causing it to go nuts.

Also I would possibly send the EBCM in to be rebuilt. There are a few here on the forum that can do it, since you can not replace them anymore and it is a growing issue on the car. If you are doing the work yourself, the labor for them to rebuild it is relatively cheap. That might clear up some of your other odd sensor codes, especially that 1265 code.

For the temp sensor, it would sound like a small animal has gotten a hold of something or the wires have rubbed against something and shorted out. Generally speaking they will go full neg. when the circuit is open. If a new sensor doesn't fix it then you need to start pulling back the wiring and tracing it to see what is broken or shorted.

That could be some of the issues with the other pieces too....


I do not think the outside air temp sensor is going to be any relation to the A/C. That might be a high pressure switch, or the system might just have a leak.