I am a proud new owner of a 2001 Corvette.

I noticed that my engine light does NOT come on even prior to starting the engine. I also noticed I have several codes which I have posted below.

The first problem I need to solve is the engine light and I need some guidance as to how to proceed. I assume I need to tear into the dash and check and/or replace the bulb. I also need some help with the codes. I assume I should just reset all codes and wait and see what codes I get and if I get an engine light.

So far I have done nothing other than to copy down the codes and post them here. This is my first post and if this is not the correct place to post please advise.

10 PCM 3 CODES
P171 HC
P174 HC
P0650 H
58 – SDM 1 CODES
B090H
99 – HVAC 1 CODES
B0361 H
A0 – LDCM 6 CODES
B2204 H
B2208 H
B2282 H
B2284 H
B2264 H
U1064H
A1 – RDCM 7 CODES
B2283 H
B2287 H
B2284 H
B2263 H
B2265 H
U1064 H
U1096 H
U1096 H
B0 – RFA 1 CODES
C2110 H

 

CLEAR ALL of the code and see what comes back. Then you can work on those.

Bill

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.

The Diagnostic Display Mode is entered with the following procedure:
1) Turn on the ignition but don't start the engine.
2) Press the RESET button to turn off any warning messages. (i.e. door open, trunk open ect)
3) Press and hold the OPTIONS button
4) While holding OPTIONS, press FUEL button four times within a 10 -second period.

Initially, the on-board diagnostics go into an Automatic Mode which will cycle through each module and shows diagnostic codes in a pre-set sequence: PCM - TCS - RTD - BCM - IPC - RADIO - HVAC - LDCM - RDCM - SCM - RFA. All codes will be displayed for each module. ( i.e. PCM = 4 codes) If none are present in a given module, you will see No More Codes on the display.

There are two types of diagnostic codes, Current and History designated with a letter suffix, “C” or “H”. A current code indicates a malfunction is present in the module displaying data. A history code indicates a problem existed sometime in the last 40 or 50 ignition cycles. When not accompanied by a current code of the same number, it's potential evidence of a previous problem, now resolved, that was not removed by clearing the codes. More likely it's an indication of an intermittent malfunction.

Intermittent codes are the most challenging of the diagnostics. An intermittent code may have happened once, may have happened more than once but is inconsistent or may be happening on a regular basis but not at the time the codes are displayed. History codes can also be caused by a current malfunction in a system that is not operating at the time codes are displayed. An example is the rear window defogger which doesn't operate until the Body Control Module detects engine rpm. For history codes set by a module that does not operate with the key on and engine off, a special diagnostic tool called a Scan Tester is necessary to properly diagnose the malfunction.

Once the system has displayed all modules, it goes into the manual mode which allows selection of each module using combinations of Driver Information Center buttons. Manual mode can also be entered during the automatic sequence by pressing any button except E/M. Once the display shows Manual Diagnostics, select a module by pressing the OPTIONS button to go forward or the TRIP button to go back. Once a module is selected, a code is displayed, and if more than one are present; press GAGES to go forward or FUEL to go back.
To exit the diagnostic mode at any time, press E/M. If you want to erase codes in a given module, press RESET To reset the codes once in manual mode, press and hold RESET until it displays NO CODES Press OPTIONS to go to the next module. Repeat the steps until you have reset the codes in all the computer modules.
NOTE!! Only reset the codes IF you want to - it is NOT necessary to do this. Clearing a code does not repair a problem. You are simply erasing the evidence of it in the module's memory. If you clear the code/s, and extinguish the Check Engine Light, your emissions status ready will NOT allow you to pass an emissions test until you have completed the required driving cycles. There are a few body module DTC’s that if set will prevent the module from operating properly. Once the DTC is cleared, the module will return to full function. This is not true for power train DTCs.

If you have never read and cleared your codes, there will probably be a lot of old history DTCs. It is recommended that you clear your codes and see if any come back during a driving cycle. Those are the ones that you need to concentrate on diagnosing.

Once you have the codes, the next question is: What to do with the information?
First, consult the factory service manual. Any serious C5 Do-It-Yourself owner should invest in the Corvette Service Manual of the appropriate model year. The Service Manual is really a requirement if you want to understand and work on your C5.

NOTE and a WARNING. You can read the DTCs while the engine is running. I pull mine up all the time while driving.
WARNING. Don’t become distracted while reading DTCs while your driving and cause an accident!!!!! Use common sense and drive safe.

These are some very good C5 Diagnostic Trouble Code (DTC) explanation web sites!!! They also explain how to read the DTCs

Here are some very good sites that explain what DTC mean:

http://www.gearchatter.com/viewtopic11755.php

http://www.obd-codes.com/trouble_cod...d-ii-codes.php

Make sure to include the H or C suffix when you post your DTCs!!

 

Welcome to the forum! You had a fine first post. You will be pointed in the right direction as one of the best has already given you some good info!

 

Thanks, I will clear the codes. I will obtain a set of service manuals as well.

Any advice on fixing the engine light?

 

After clearing all codes what remains after a single drive is:

10 PCM 3 CODES
P171 HC
P174 HC
P0650 H

Total mileage is ~130,000

 

I will look for air leaks.

Probably a burnt out or missing MIL bulb. Hopefully someone can give me the procedure for removing the instrument panel to access the bulb. I also need a part number for the bulb.

Thanks,
Dave

 

 

Thanks to the help here I was able to fix my vacuum leak in the parking lot of the auto store using a piece of fuel line. I am now down to the single P0650 code. Thanks guys.

I was not able to fix the P0650 code as I do not have a part number or source to replace the MIL (check engine light). I guess I need to get a Parts Manual. Can anyone tell me the best way to obtain a manual?

 

Have you seen this post? It has the bulb info in it:

http://forums.corvetteforum.com/c5-t...ine-light.html

 

Wow! I am also new on here and had some similar questions as the OP. Some of the info on here is really priceless for newbies like me.