Check Engine Light
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Obtaining Vehicle Codes from the DIC
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:
Turn on the ignition but don't start the engine.
Press the "reset" button to turn off any warning messages
Press and hold "options" and
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.
BC
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:
Turn on the ignition but don't start the engine.
Press the "reset" button to turn off any warning messages
Press and hold "options" and
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.
BC
Safety Car
Joined: Jul 2002
Posts: 3,874
Likes: 0
From: Fishing Somewhere Cold
St. Jude Donor '11-'12-'13, '15
Turn key to on position but dont start car. Hold in options button and press fuel button 4 times. It will then scroll through any codes present, write em down and post em! Also you can reset any codes by pressing reset after you write them down.
Heel & Toe
Joined: Oct 2009
Posts: 19
Likes: 0
From: Beaumont, CA
10 PCM P0442 H
28 TCS C1214 HC
C 1288 H
BO RFA C 2100 H
C 2110 H
C 2115 H
After reading the codes I "reset", drove the car, and no see no codes.
In the post, you show a number after each module, i.e. 10 PCM 6-357 - 6-361. I have the shop manual and these are not page numbers, what are they?
Thanks for the help, the shop manual is useless for this.
Burning Brakes
Joined: Jan 2006
Posts: 1,170
Likes: 27
From: Magnolia Greens NC
I sent you help on this..
I ran the DIC recall of codes and got these:
28 TCS C1214 HC
After reading the codes I "reset", drove the car, and no see no codes.
In the post, you show a number after each module, i.e. 10 PCM 6-357 - 6-361. I have the shop manual and these are not page numbers, what are they?
Thanks for the help, the shop manual is useless for this.
28 TCS C1214 HC
After reading the codes I "reset", drove the car, and no see no codes.
In the post, you show a number after each module, i.e. 10 PCM 6-357 - 6-361. I have the shop manual and these are not page numbers, what are they?
Thanks for the help, the shop manual is useless for this.
read the tutorial you asked me to send you (below) on your C1214C code...........
Quote:
Originally Posted by trussme View Post
I need your email address to send my complete tutorial with PHOTOS.
to:Bill "trussme" Trussell
I have been living with these messages, even after spending $1,000 for dealer efforts to fix. Please send me info emullick@yahoo.com
