Trouble code P1626, input needed..
Thread Starter
Heel & Toe
Joined: Aug 2004
Posts: 20
Likes: 0
Trouble code P1626, input needed..
Just finished the engine swap on Vette #2, all was going as planned until we fired it up. It starts for about two seconds then shuts the fuel off. When pulling the trouble codes we get DTC P1626 related to the theft deterrent system which cuts the fuel when the passwords sent through the serial cable do not match up. I understand that the possibilities are one of the following: Poor connection, Open Circuit, Grounded Circuit, and/or Shorted Voltage. We have tried most everything we can think of. We are just getting frustrated trying to come up with a resolution. Anyone experience this problem or know of any remedies or things to try next.
Thanks in Advance,
-Mike Tracy
Thanks in Advance,
-Mike Tracy
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
The only two things that are in that circuit are the BCM and the ignition switch. If the pellet in the key is bad or dirty, it will cause this problem. If the contacts inside the cylinder lock are dirty or bad, it will cause the same problem. Looks like the PCM is good cause it supplies fuel and then shuts it off!
Try cleaning the resistor pellet on the key or using your spare key.
Bill
Try cleaning the resistor pellet on the key or using your spare key.
Bill
Thread Starter
Heel & Toe
Joined: Aug 2004
Posts: 20
Likes: 0
Originally Posted by Bill Curlee
The only two things that are in that circuit are the BCM and the ignition switch. If the pellet in the key is bad or dirty, it will cause this problem. If the contacts inside the cylinder lock are dirty or bad, it will cause the same problem. Looks like the PCM is good cause it supplies fuel and then shuts it off!
Try cleaning the resistor pellet on the key or using your spare key.
Bill
Try cleaning the resistor pellet on the key or using your spare key.
Bill
No dice
Cleaned the pellet, used a spare key, and inspected the cylinder, still starts for a second then dies. I think that there has to be something in the computer possibly the BCM which is sending the wrong signal. I tried disconnecting the positive terminal on the battery, removing fuses 23 and 25 then connecting them after 10 minutes and still nothing.
Drifting
Joined: May 2002
Posts: 1,607
Likes: 1
From: San Francisco CA
The fact that the vehicle starts at all indicates that the Password from the BCM was initially received by the PCM but that they susequently lost communications with each other, which caused the PCM to go into VTD Fail-Enable mode. Once it is in VTD Fail-Enable mode, the vehicle will start and run a bit until the PCM sees that communications have not been restored and shuts the engine down. Most likely cause of this is poor connections.
Check and clean the PCM & BCM connectors with contact cleaner. Also check and clean the associated ground connections as well. Bill Curlee has a sticky at the top of this page that may be a help with the grounds.
Check and clean the PCM & BCM connectors with contact cleaner. Also check and clean the associated ground connections as well. Bill Curlee has a sticky at the top of this page that may be a help with the grounds.
Last edited by SFVetteman; Jun 6, 2006 at 01:00 PM.
Burning Brakes
Joined: Sep 2001
Posts: 1,173
Likes: 1
From: Aguila AZ
You must conduct the PCM/BCM relearn process before it will continue to run. Here is the procedure:
1. Turn 'on' the key for 11 minutes or more.
2. Turn 'off' the key for 30 seconds or more.
3. Repeat steps 1 and 2 ,two more times (three cycles).
4. Turn 'on' the key for 30 seconds.
The car should run if the above procedure is done properly.
Shirl Dickey
1. Turn 'on' the key for 11 minutes or more.
2. Turn 'off' the key for 30 seconds or more.
3. Repeat steps 1 and 2 ,two more times (three cycles).
4. Turn 'on' the key for 30 seconds.
The car should run if the above procedure is done properly.
Shirl Dickey
Thread Starter
Heel & Toe
Joined: Aug 2004
Posts: 20
Likes: 0
Originally Posted by SFVetteman
The fact that the vehicle starts at all indicates that the Password from the BCM was initially received by the PCM but that they susequently lost communications with each other, which caused the PCM to go into VTD Fail-Enable mode. Once it is in VTD Fail-Enable mode, the vehicle will start and run a bit until the PCM sees that communications have not been restored and shuts the engine down. Most likely cause of this is poor connections.
Check and clean the PCM & BCM connectors with contact cleaner. Also check and clean the associated ground connections as well. Bill Curlee has a sticky at the top of this page that may be a help with the grounds.
Check and clean the PCM & BCM connectors with contact cleaner. Also check and clean the associated ground connections as well. Bill Curlee has a sticky at the top of this page that may be a help with the grounds.
Checked and cleaned connectors as well as wire brushed the grounds, still pulling the codes and won't keep running after 1-2 seconds after start. What could be next?
Thread Starter
Heel & Toe
Joined: Aug 2004
Posts: 20
Likes: 0
Originally Posted by MrEracer
You must conduct the PCM/BCM relearn process before it will continue to run. Here is the procedure:
1. Turn 'on' the key for 11 minutes or more.
2. Turn 'off' the key for 30 seconds or more.
3. Repeat steps 1 and 2 ,two more times (three cycles).
4. Turn 'on' the key for 30 seconds.
The car should run if the above procedure is done properly.
Shirl Dickey
1. Turn 'on' the key for 11 minutes or more.
2. Turn 'off' the key for 30 seconds or more.
3. Repeat steps 1 and 2 ,two more times (three cycles).
4. Turn 'on' the key for 30 seconds.
The car should run if the above procedure is done properly.
Shirl Dickey
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
Originally Posted by MPT
Just finished the engine swap on Vette #2, all was going as planned until we fired it up. It starts for about two seconds then shuts the fuel off. When pulling the trouble codes we get DTC P1626 related to the theft deterrent system which cuts the fuel when the passwords sent through the serial cable do not match up. I understand that the possibilities are one of the following: Poor connection, Open Circuit, Grounded Circuit, and/or Shorted Voltage. We have tried most everything we can think of. We are just getting frustrated trying to come up with a resolution. Anyone experience this problem or know of any remedies or things to try next.
Thanks in Advance,
-Mike Tracy
Thanks in Advance,
-Mike Tracy
I07 is on the back of the drivers side cylinder head. Two black wires in asingle eyelet connection.
106 is on the pasengers side of the bloch above the starter. There are two wires on G106 The battery ground and a single wire that grounds the PCM , MAF plus some other stuff!!
105 is the same place 106 is but on the drivers side.
Bill
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
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Melting Slicks
Joined: Mar 2003
Posts: 3,116
Likes: 10
From: Macomb MI
Originally Posted by MPT
Just finished the engine swap on Vette #2, all was going as planned until we fired it up. It starts for about two seconds then shuts the fuel off. When pulling the trouble codes we get DTC P1626 related to the theft deterrent system which cuts the fuel when the passwords sent through the serial cable do not match up. I understand that the possibilities are one of the following: Poor connection, Open Circuit, Grounded Circuit, and/or Shorted Voltage. We have tried most everything we can think of. We are just getting frustrated trying to come up with a resolution. Anyone experience this problem or know of any remedies or things to try next.
Thanks in Advance,
-Mike Tracy
Thanks in Advance,
-Mike Tracy
If those there in lies the problem and the Vats being enabled.
Thread Starter
Heel & Toe
Joined: Aug 2004
Posts: 20
Likes: 0
Finally the car has started!!!! We had to swap out the BSM then complete the 30 min reset process. It kicked over on the first try once complete and it sounds sweet! Tomorrow we will have to tackle the ABS and Active Handling codes, but it's just good to know it running and we don't have to troubleshoot that area any longer. Thank you all again for your help, you guys are very helpful.
-Mike Tracy
-Mike Tracy
