Took the vette out for a spin after claying, polishing and waxing the exterior, it has set for a while, with a new alt, bat, and starter being the last set of parts replaced several months back. It got new shoes today also, Nitto 555RII, DOT legal road race tires, and its finally tamed on the steet without the sorry handling of drag radials.

So that's all the good news. Thought I could finally have some fun with the Vette again.

On my hour and a half or so drive around town, the first issue was that my fuel guage went to empty all of a sudden. My last fill was Chevron, and this has happened on a long trip before, an annoying common GM issue it seems, that I'll wait for a fix for. I don't know what to do about it yet however, and some of the codes seem related.

Then there was a light scape sound from the rear, so I may need new rear pads, so I'll take care of that and tighten up the exhaust that is rattling a little soon as I get a chance.

Then, on my way back (this has happened only twice before over several years, with an SY 3500 converter, but only on long trips) I get a check engine light, and the A4 starts shifting much more firmly (increased line pressure). The tranny was also rebuilt less then 1500 miles ago, and its happen once LONG before the rebuild and loss of gears. I get back home and its codes gallore! Not sure what causes the tranny to do this, its a rare occurrence, Tranny temp was 199.

10-PCM (WHAT DO I NEED TO DO?)
P0463 Fuel Level Sensor 1 Circuit High Voltage -C
P1431 Fuel Level Sensor 2 Circuit Performance -C
P1433 Fuel Level Sensor 2 High Voltage -C
P1870 ???? (Don't know)

28 TCS (Don't have active handling on the car, this has been like this sense a cam install 21MC. I think Steering column sensor was unaligned. Any input welcome.)
C1255 EBTCM Internal malfunction
C1281 Steering Sensor Uncorrelated Malfunction
C1286 Steering Sensor Bias Malfunction

A0 LDCM Left Door Control module (what? MY Doors? WTF)
U1064 Loss of Communications with DCM (No State of Health Message)
A1 RDCM Right Door Control Module
U1064 Loss of Communications with DCM

BO RFA
U1096 Loss Of Communication with IPC (No SOH Message Received -RFA
U1064 Loss Of Communication with DCM (No SOH Message Received -RFA
U1016 Loss Of Communication with PCM (No SOH Message Received -RFA

 

Wow,,,, this is going to be a LONG post!!!

Lets start with all of the "U" codes. They normaly indicate that the modules have seen a loss or very low voltage (less than 9 VDC) for a brief period of time. Normaly seen during cranking. Most likely, your battery is low on charge from sitting OR is ready to die. Charge the battery, clear the codes and see if the codes come back. The LDCM & RDCM are normaly first to report this code. Very sensitive!
10-PCM (WHAT DO I NEED TO DO?)
P0463 Fuel Level Sensor 1 Circuit High Voltage -C Most likely caused because the fuel level sensor is very dirty of the sensor is bad. Try running a double dose of Chevron Techron Fuel System treatment in the tank to clean the sensor.

P1431 Fuel Level Sensor 2 Circuit Performance -C Most likely caused because the fuel level sensor is very dirty of the sensor is bad. Try running a double dose of Chevron Techron Fuel System treatment in the tank to clean the sensor.


P1433 Fuel Level Sensor 2 High Voltage -C Most likely caused because the fuel level sensor is very dirty of the sensor is bad. Try running a double dose of Chevron Techron Fuel System treatment in the tank to clean the sensor.


P1870 ???? (Don't know) No clue either. Are you sure it is that numbe?. Is it history or current?

28 TCS (Don't have active handling on the car, this has been like this sense a cam install 21MC. I think Steering column sensor was unaligned. Any input welcome.)
C1255 EBTCM Internal malfunction I see a LOT of these types of codes on the early cars. The EBTCM is rear mounted and is subject to lots of damage from sand, salt, water, and vibration. The EBTCM has a external ground that is located on the EBTCM motor. (I have pictures of it and will send them to you if you send me your e-mail address. My photo bucket account is messed up) The ground gets corroded on the motor and at the chassis grounding point. Cleaning the ground points is the FIRST logical step in attempting repair if this module. It cost tons of money to replace the module. My theroy is that the ground on the motor was probably the only thing wrong with it!

C1281 Steering Sensor Uncorrelated Malfunction. Do an alignment on the sensor. C1286 Steering Sensor Bias Malfunction. Do an alignment on the sensor.

A0 LDCM Left Door Control module (what? MY Doors? WTF)
U1064 Loss of Communications with DCM (No State of Health Message)
A1 RDCM Right Door Control Module
U1064 Loss of Communications with DCM

BO RFA
U1096 Loss Of Communication with IPC (No SOH Message Received -RFA
U1064 Loss Of Communication with DCM (No SOH Message Received -RFA
U1016 Loss Of Communication with PCM (No SOH Message Received -RFA

 

Great answers from Bill! I may be able to offer some insight on the 1870 code, since I used to get it on my '04.

P0894 and P1870 are both "Transmission Component Slipping" (typically low pressure detected). However, the 1870 code refers specifically to the torque converter. To verify that you don't have an actual mechanical problem, shut the car off (30 seconds or so), then restart and do a test drive. The problem should be gone now (it always was for me). I eventually solved the problem by increasing line pressure slightly via tuning. I have no idea why a new, stock drivetrain car would have this periodic issue, but that's what worked for me.

Oh yeah, here is the source I used to get me going in the right direction re that code:
http://myweb.accessus.net/~090/dtcobd2p.html#pow

 

I get these codes periodically: C1281 Steering Sensor Uncorrelated Malfunction. Do an alignment on the sensor. C1286 Steering Sensor Bias Malfunction. [I]Do an alignment on the sensor. [/I]

As for doing an alignment, I'm not sure what this means or how to do it. The Service manual says to take voltage readings using an OBDII I believe it should be +/- 5 vDC as you turn the wheel. If you are not getting the +/- 5 vDC, you will need to replace the the steering wheel position sensor, which requires tearing the column apart. Supposedly not too tought for a DIY, but I'm not that brave... yet. These codes should also throw a Service Vehicle Soon message on your DIC. Mine does.

Best of Luck!

Joe

 

I will look in the manual and see if I can figure out a way to align it using simple hand tools and a volt meter.

Bill C

 

Yes, the tranny issue goes away after restrarting the car. Its only happened 2 or 3 times over the span of several years. My converter is not stock and is the SY3500.

I will get some techron fuel treatment today, by double, you recommend putting in 2 at the same time, or back to back? It is real sandy hear, been a year or so, might want to replace the fuel filter again also after the treatment runs through.


What effects on my car does the ETBCM error have? I will try to look for it when I tighten the axhaust and adjust the mufflers. You can send pic to mbarnes1@elp.rr.com that will help me a great deal in locating it when its on the lift.

 

Yes, the stearing sensor annoys me with the Service Vehicle Soon message on startup, however not having actiev handling, it seems to have no effect on the car, other then annoying me. Figured I'd save the work for when I do more engine mods.

 

I sent ya a pile of EBTCM and chassis ground pictures. Please let me know if they came through alright.

BC

 

Its not that you need to have Active Handling for the sensor to mess things up. It inputs to the ABS and traction control system. So, its a bit more serious than what you perceive it.

 

As far as the steering sensor issue, it's possible the steering wheel is out of sync. This can happen when the steering shaft is disconnected from the steering rack box during a cam swap and the rack is removed to allow access to the pulley and timing cover. If the wheel steering wheel is turned in one direction or the other and then not recentered, the sensor will be out of sync causing the PCM to throw codes. Hopefully, the alignment procedure can restore the correct orientation.

 

That is what I thought, and it needs to be realigned. Next time I have it at a Vette shop, we will take care of this. Once I has an ABS issue on the dyno, bit everyone told me that was normal because the front wheels are not turning, now I wanter how the stearing sensor is effecting the car, doesn't seem to do anything except annoy the driver with the serice soon message.

I'm going to run the car daily for a week or two with the Techron treatment and see if I can correct the fuel sensor issues.