C1226 at 90mph
Thread Starter
Racer
Joined: Oct 2007
Posts: 380
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From: Knoxville Tennessee
C1226 at 90mph
I recently found out at 90mph I get codes c1226 and c1236 (I think), both rf wheel codes, speed difference and voltage. It only happens once I reach 90, I checked the bearings were ok and the harness looks to be making good contact, the female contacts don't appear to be worn out. Any suggestions from the gurus?
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
Remove the front wheel jumper harness and inspect the female pins inside the jumper AND ON THE CONNECTOR ON THE K Member.
MAke SURE that female pins are not spread apart or deformed.
Find the Hot in RUN & Start fuses for the EBTCM and measure the supply voltage from the tests points on top of the fuse to chassis ground. Must be the same as battery voltage measured directly on the battery terminals.
Check Ground points G-101 and G-104/108. Make SURE that they are 100% clean and tight
I have see FOUR EBTCMs that error out at specific vehicle speeds.
Mine would fail at 42 mph. A buddy in Boston would fail at 102. If,,,,,,,, you check the harness female pins and the ignition voltages at the EBTCM fuses (there are three fuses) and every thing checks out SAT,,, you will need a new EBTCM to correct the issue.
If nothing external is wrong, the Microprocessor inside the EBTCM is defective.
MAke SURE that female pins are not spread apart or deformed.
Find the Hot in RUN & Start fuses for the EBTCM and measure the supply voltage from the tests points on top of the fuse to chassis ground. Must be the same as battery voltage measured directly on the battery terminals.
Check Ground points G-101 and G-104/108. Make SURE that they are 100% clean and tight
I have see FOUR EBTCMs that error out at specific vehicle speeds.
Mine would fail at 42 mph. A buddy in Boston would fail at 102. If,,,,,,,, you check the harness female pins and the ignition voltages at the EBTCM fuses (there are three fuses) and every thing checks out SAT,,, you will need a new EBTCM to correct the issue.
If nothing external is wrong, the Microprocessor inside the EBTCM is defective.
Thread Starter
Racer
Joined: Oct 2007
Posts: 380
Likes: 0
From: Knoxville Tennessee
Thanks, I'll try checking those. I found out yesterday it comes on at 86mph exactly, had some opportunity yesterday to creep up in speed, with out fail as soon as it hit 86 it'd light up.
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
Well,,,,,,,,,,,,,,,,,,,,,,,,,,,,
,,,,,,,,,,,, I'm sorry to say,,, to fix it,, you will need a NEW EBTCM.
Thats the same problem that I had and the bad component/part is inside the microprocessor (NOT REPAIRABLE) Its a LOGIC error.
Unless you do a LOT of high speed driving, you may be able to just live with it.
Bill
,,,,,,,,,,,, I'm sorry to say,,, to fix it,, you will need a NEW EBTCM. Thats the same problem that I had and the bad component/part is inside the microprocessor (NOT REPAIRABLE) Its a LOGIC error.
Unless you do a LOT of high speed driving, you may be able to just live with it.
Bill
Pro
Joined: Jun 2012
Posts: 633
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From: Van Buren Arkansas
Mine did the same thing at the same speed and all it was was the wires touching the driver side header and causing a short, I re-wrapped the wires and zip-tied them out of the way and no problems anymore. I'd check to make sure that's not your problem.
