Let me start by saying i have a H/C 99 Fixed roof coup. When i recieved the car the tune was not the best, but progressively got worse as summer started. Breaking up everytime i drove the car, i assumed it was just cam buck but as it got worse it was apparent that was not the cause. It would get better in the higher rpm ranges... needless to say, I needed a tune badly.

I took it to get the OBDII codes read and i had a sensor 2 bank 1 running lean msg.

Fastfoward to this past week i took the car to an extremely well known shop here in NC. When they got the car it would not hold a steady idol, going from 400 - 1200 rpm randomly.

The o2 sensor wires were laying on the header and the wires burned through, causing the o2 sensors to stop working. This caused alot of carbon build up on the o2 sensors and plugs.

After replacing the plugs, the o2 sensor fuse was blown. After replacing that the shop started tuning. The whole way home the car ran perfect, getting over 30mpg, smooth idol, almost perfect. No warning lights on. The next time i drove the car was today.

When i started the car i recognized a code on the OBC, it read CHARGE SYSTEM FAULT. The CHECK ENGINE light was also on, I needed to get to class so I ignored both codes and was planning on looking into it after class.

After class i took it to Autozone to get the OBDII codes read for a second time. The code was P0155. also listed under the definition is : H02S21- heater condition (heated oxygen sensor bank 2 sensor 1). Listed is the powertrain control module monitors the oxygen sensor heater. the computer has recognised a failure in this circuit. Probable causes were listed as oxygen sensor defective, poor connection at oxygen sensor, and check circuit fuse. Later, I checked the fuse but it was still good.

As i was on my way home the CHECK GAUGES light appeared, accompanied by these readings on the OBC: LOW VOLTAGE, SERVICE ABS, and SERVICE TRACTION CONTROL. The voltage reading was below 11 when i cut the car off in the garage.


here is a list of the OBC Readings:
Charge System Fault
Service ABS
Service Traction System
Low Voltage
Check Guages
Check Engine
Bank 2 Sensor 1 - H02S21

this is a list of the codes the car was throwing:

10 PCM - 3 Codes
-P0155 H C
-P1637 H
-P1698 H C

28 TCS - 4 Codes
-C 1221 H
-C 1222 H
-C 1236 H
-U 1016 H

40 BCM - No Codes

58 SDM - 3 Codes
-U 1000 H
-U 1016 H
-U 1064 H

60 ICP - 7 Codes
-U 1016 H
-U 1064 H
-U 1040 H
-U 1088 H
-U 1176 H
-U 1005 H
-U 1160 H

Any help would be greatly appreciated as i am still in college and have already spend

over $1000 trying to fix these problems.

 

You evidently clicked "submit reply" twice and duplicated your thread.

You can ask a moderator to delete one by clicking on the red triangle beneath your user name.

 

I didn't see another thread with this title, so will reply to this one. Bill Curlee is the man you need to talk too. My thoughts are to back up to the charge system fault message to start with. Low battery voltage will cause all sorts of codes to come up and thing to not work correctly, if at all. So, start with a meter across the battery with the engine off and see what you've got in static voltage. You need to be seeing a minimum of 12.5vdc. If not, time to look at the battery connections themselves as well as the battery to solenoid connections and finally the alternator connections, making sure all are clean and tight. Do not forget that they are electically hot while messing with them unless you disconnect the battery first. Do this, clear the codes, then start it up and see where you stand next.

 

 

loose battery cables or bad battery would be the first thing to check. have you charged the battery recently?

 

Get Bill to send you a diagram of all the ground points on you car. Several of the codes you posted are possible ground problems!


G105 was the culprit on my probs a while back!

 

First off yopu don't need to got to autozone to read your codes.

Your car has the ability to display them, here's how.

The IPC display, the 20-character, vacuum florescent screen above the steering column that says "Corvette by Chevrolet" every time you turn on the key, is a powerful device. DIY Service Techs are going to be most interested in the IPC's ability to show diagnostic trouble codes (DTC) for all the modules that transmit them.
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
3. Press and hold "options" and
4. While holding "options", press "fuel" four times within a 10-second period.

Inititially, the on-board diagnostics go into the "automatic" mode which shows each module's DTCs in a pre-set sequence:

• 10 PCM Powertrain Control Module page 6-357 - 6-361
• 28 TCS Traction Control system ABS on page 5-86
• ?? RTD Real Time damping page 3-136 (I do not have this option)
• 40 BCM Body Control Module page 8-405 UTD Page 8-727
• 60 IPC Instrument Panel Cluster page 8-508
• 80 radio page 8-213
• 99 HVAC Heater Vent-Air Conditioning page 1-118
• A0 LDCM Left Door Control module page 8-904 to 8-951
• A1 RDCM Right Door Control Module page 8-904 to 8-951
• AC SCM Seat Control module page 8-1064 -8-1082
• B0 RFA Remote Function Actuation page 8-676

For each module, all DTCs will be displayed. If none are present in a module, you will see "no more codes" on the ICP display.
There are two kinds of DTCs, "Current" and "History," designated with a letter suffix, "C" or "H". A current code indicates that the malfunction is present in the system whose module is displaying data. A history code indicates a problem existed in that module sometime in the last 40 or 50 ignition cycles. When not accompanied by a current code of the same number, it is possible it's evidence of a previous problem, now solved, that was not removed by clearing codes. More likely is that a history code indicates an intermittent malfunction. "Intermittents" are the most challenging DTCs. An intermittent may have happened only once, may have happened more than once but is inconsistent in its appearance or may be happening on a regular basis but not at the time the IPC is displaying codes. History codes can also be caused by a current malfunction in a system that is not operating at the time DTCs are displayed. An example is the rear window defogger which doesn¹t operate until the BCM detects engine rpm. For history codes set by a system 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 IPC has displayed all 11 modules, the system goes into the manual mode which allows selection of each module using combinations of DIC buttons. The manual mode can also be entered at any time during the automatic sequence by pressing any button except "E/M". Once the IPC displays "manual diagnostics," you may select a particular module by pressing the "options" button to go forward or the "trip" button to go back. Once a system is selected and a DTC is displayed, if more than one are present; press "gages" to move forward or "fuel" to go back.
To exit the diagnostic mode at any time, press "E/M". If you want to erase or "clear" codes, press "reset." Clearing a code does not repair a problem. You are simply erasing the evidence of it in the module's memory.
• 10 PCM Powertrain Control Module page 6-357 - 6-361 Domestic
• A=DTC set immediately and MIL is turned on
• B=MIL turned on after 2 consecutive drive trips
• C=After one failure and stored in History MIL not turned on