IAT Sensor Errors again!! Ugh! Help.
Thread Starter
Drifting
Joined: Aug 2001
Posts: 1,878
Likes: 0
From: EP Texas
St. Jude Contributor
IAT Sensor Errors again!! Ugh! Help.
Getting 10-PCM
P0113 HC
P111 HC
Codes again, 2 times this week. I had this problem a few months ago, and I replaced the IAT sensor (only about $10 or $15) and the connector and the problem went away for a while.
Car seems to work fine, but throwing these codes again??
P0113 HC
P111 HC
Codes again, 2 times this week. I had this problem a few months ago, and I replaced the IAT sensor (only about $10 or $15) and the connector and the problem went away for a while.
Car seems to work fine, but throwing these codes again??
Burning Brakes
Joined: Dec 1999
Posts: 1,121
Likes: 0
From: Atlanta GA
Re: IAT Sensor Errors again!! Ugh! Help. (TexCorvette)
I have the same problem.
Is autotap saying your sensor is at -38 degrees F? Take the jumper harness and short it together (stick a wire in both sides of the harness) and hook up autotap and read the temperature and post if its the same or if it says 284 degrees F.
This is what the Gm service manual says to do.
If that doesn't work connect the harness to a good ground and read the temperature again.
Is autotap saying your sensor is at -38 degrees F? Take the jumper harness and short it together (stick a wire in both sides of the harness) and hook up autotap and read the temperature and post if its the same or if it says 284 degrees F.
This is what the Gm service manual says to do.
If that doesn't work connect the harness to a good ground and read the temperature again.
Thread Starter
Drifting
Joined: Aug 2001
Posts: 1,878
Likes: 0
From: EP Texas
St. Jude Contributor
Re: IAT Sensor Errors again!! Ugh! Help. (cjones)
Why does GM tell you to do this, to tell if the sesor is good or bad? I can't believe its bad as its new, but luckily its a $10-$15 at a autozone/pepboys/whatever car parts palce.
I noticed today that it does it a lot more at the track, sitting, and then running throwing the code every few minutes, but a 20 plus minute ride home, nothing at all?
Anyone else have some more information for us? Should I just go by another one, maybe Delco instead of wells or what the autopart places have?
[Modified by TexCorvette, 7:17 PM 8/10/2002]
I noticed today that it does it a lot more at the track, sitting, and then running throwing the code every few minutes, but a 20 plus minute ride home, nothing at all?
Anyone else have some more information for us? Should I just go by another one, maybe Delco instead of wells or what the autopart places have?
[Modified by TexCorvette, 7:17 PM 8/10/2002]
Race Director
Joined: Mar 2000
Posts: 17,602
Likes: 20
From: Palm City Florida
Re: IAT Sensor Errors again!! Ugh! Help. (TexCorvette)
Getting 10-PCM
P0113 HC
P111 HC
Codes again, 2 times this week. I had this problem a few months ago, and I replaced the IAT sensor (only about $10 or $15) and the connector and the problem went away for a while.
Car seems to work fine, but throwing these codes again??
P0113 HC
P111 HC
Codes again, 2 times this week. I had this problem a few months ago, and I replaced the IAT sensor (only about $10 or $15) and the connector and the problem went away for a while.
Car seems to work fine, but throwing these codes again??
Go to Radio Shack and buy a 4.7k ohm resistor... $.89
Plug it into the socket where the IAT sensor goes. Then run an Autotap. IT should read exactly 57 degrees..That will tell you the IAT circuitry is good.
Then after that. Leave the resistor in and forget about it. The Motor will run with a little more timing advance cause it thinks it's cold outside.. :D
Pro
Joined: Jun 2000
Posts: 667
Likes: 55
From: Romulus NY
Re: IAT Sensor Errors again!! Ugh! Help. (TexCorvette)
I had the same problem. The tech at the dealership traced it back to a broken wire leading to the sensor. He replaced the wire (making it a little longer - he said it was pulled a little tight) and I haven't had a problem since.
Thread Starter
Drifting
Joined: Aug 2001
Posts: 1,878
Likes: 0
From: EP Texas
St. Jude Contributor
Re: IAT Sensor Errors again!! Ugh! Help. (mcjoslyn)
I replaced the connector which came with the wire. I'll try to trace it a little further back, but haven't seen anything so far. Maybe I'll just get another sensor, or the radio shack. UGh!
Burning Brakes
Joined: Dec 1999
Posts: 1,121
Likes: 0
From: Atlanta GA
Re: IAT Sensor Errors again!! Ugh! Help. (TexCorvette)
The tests are done to see if it is the sensor, the wiring or the PCM. I pulled the sensor out of my 98 (which according to Atap did work) and put it in my 99 and it didn't work. Tells me it's not the sensor. Since grounding it didn't show the 284 degrees it's suppose to, for me at least the resistor would probably not show 50 something degrees.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
2027 Corvette vs The World: Every Model vs Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
2027 Corvette Buyer's Guide: Everything You Need to Know!
Joe Kucinski
10 Things C8 Corvette Owners Hate (But Won't Tell You)
Joe Kucinski
10 Best Corvettes Coming to Barrett-Jackson Palm Beach 2026!
Brett Foote
Every Corvette Grand Sport Explained! (C2, C4, C6, C7, & C8)
Joe Kucinski
Grand Sport & Grand Sport X Launch Alongside All-New 535hp LS6 V8!
Michael S. Palmer
5 Reasons Bad Drivers Crash & 5 Ways to Avoid a Costly Mistake!
Joe Kucinski
Thread Starter
Drifting
Joined: Aug 2001
Posts: 1,878
Likes: 0
From: EP Texas
St. Jude Contributor
Re: IAT Sensor Errors again!! Ugh! Help. (cjones)
Well last time, most said it wouldn't be the sensor, but the connector, so I just replaced both just in case and had a few months of no codes?
Melting Slicks
Joined: Feb 2001
Posts: 3,360
Likes: 1
From: DFW TX
Senior Member
Cruise-In III Veteran
Cruise-In IV Veteran
Re: IAT Sensor Errors again!! Ugh! Help. (TexCorvette)
I had the same problem with my IAT. I had replaced the sensor, but the problem came back. The dealership ran a new wiring harness to the PCM and cleared it up.
