Codes Reappear
Thread Starter
Racer
Joined: Oct 2006
Posts: 337
Likes: 0
Codes Reappear
Ok After Clearing the codes in my car about 2 weeks ago the car drove fine and no problems, then it started acting up a little I went to read the codes in my car again and it is showing the same codes I cleared 2 weeks ago H22, and H67.Does anybody have any idea what the problem is?? I thought when you cleared the codes they wouldn't come back
Safety Car
Joined: Jun 2006
Posts: 3,629
Likes: 28
From: FL
The purpose of the codes setting at all is to aid diagnosis of possible problems. If you cleared the codes and they return it is likely there is actually a problem that must be corrected.
Here is a link that describes the codes, but you will need a service manual to troubleshoot and correct the actual problem. Keep in mind that a code that mentions a sensor does NOT indicate the sensor is bad, it simply identifies the circuit that is outside the parameters the PCM recognizes as correct, good luck.
http://chevythunder.com/199295_lt1_trouble_codes.htm
Here is a link that describes the codes, but you will need a service manual to troubleshoot and correct the actual problem. Keep in mind that a code that mentions a sensor does NOT indicate the sensor is bad, it simply identifies the circuit that is outside the parameters the PCM recognizes as correct, good luck.
http://chevythunder.com/199295_lt1_trouble_codes.htm
Thread Starter
Racer
Joined: Oct 2006
Posts: 337
Likes: 0
As for the H22 is the Tps voltage low I replaced my Tps about a month ago brand new from napa the code went away, There has to be something wrong when Im driving my car on the interstate or open road my service asr, asr off light comes on and sometimes when I go to put the car in park then reverse there is a hard shift in the gear
Melting Slicks
Joined: Aug 1999
Posts: 2,240
Likes: 42
From: Baltimore, MD USA
DTC 22 sets when TPS voltage falls below .23 volts.
Normally should be arouind .6 volts at idle.
If DTC 22 sets Malfunction Indicator lights, the following will happen.
No transmission torque converter lock, high transmission line pressure, harsh shifts, fixed shift points and no 4th gear in hot mode.
When the TPS is replaced, you're supposed to use a Tech 1 so the ABS/TCS system can learn the new TPS voltage at idle.
1)Ignition off
2)Connect Tech 1 with Mass Storage Cartridge
3)Turn ignition to Run
4)Follow menu to ABS/TCS feature
5)Select F5 TPS Learn
6)Press Up arrow to begin learn procedure
7)Wait for Tech 1 to indicate complete
8)Ignition off
9)Remove Tech 1
I'm sure many people have replaced the TPS without doing the Re-learn procedure but since you're having a problem and replaced the TPS it's possible it could be causing your problem.
You could also disconnect the battery and reseat the 4 connectors on the PCM.
DTC 67 is a problem with the AC system.
For some reason when the AC is supposed to turn on (compressor clutch engage) the PCM is not seeing a pressure change of at least 9psi.
DTC 67 is used to detect problems with the AC compressor clutch circuit and the Refrigerant Pressure Sensor.
Normally should be arouind .6 volts at idle.
If DTC 22 sets Malfunction Indicator lights, the following will happen.
No transmission torque converter lock, high transmission line pressure, harsh shifts, fixed shift points and no 4th gear in hot mode.
When the TPS is replaced, you're supposed to use a Tech 1 so the ABS/TCS system can learn the new TPS voltage at idle.
1)Ignition off
2)Connect Tech 1 with Mass Storage Cartridge
3)Turn ignition to Run
4)Follow menu to ABS/TCS feature
5)Select F5 TPS Learn
6)Press Up arrow to begin learn procedure
7)Wait for Tech 1 to indicate complete
8)Ignition off
9)Remove Tech 1
I'm sure many people have replaced the TPS without doing the Re-learn procedure but since you're having a problem and replaced the TPS it's possible it could be causing your problem.
You could also disconnect the battery and reseat the 4 connectors on the PCM.
DTC 67 is a problem with the AC system.
For some reason when the AC is supposed to turn on (compressor clutch engage) the PCM is not seeing a pressure change of at least 9psi.
DTC 67 is used to detect problems with the AC compressor clutch circuit and the Refrigerant Pressure Sensor.
Last edited by Hooked on Vettes; Sep 10, 2007 at 09:34 PM.
Melting Slicks
Joined: Aug 1999
Posts: 2,240
Likes: 42
From: Baltimore, MD USA
The Tech 1, or Tech 1A (a latter model) is a hand held tester used by GM service people to trouble shoot older computer controlled engines.
You can find them used on E-bay for around $175.00 plus you need the Mass Storage Cartridge which contains the Software Programs and the proper cable adapter to hook to the 16 pin diag. connector above the driver side knee.
Or you can go to the dealer and have it done.
You can find them used on E-bay for around $175.00 plus you need the Mass Storage Cartridge which contains the Software Programs and the proper cable adapter to hook to the 16 pin diag. connector above the driver side knee.
Or you can go to the dealer and have it done.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
