no starter after pcm swap?
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TECH Enthusiast
Joined: Jan 2012
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no starter after pcm swap? hey guy i need some help/ direction here
car:04 cts-v (t56)
new tranny: 4l80e
harness: speartech add on
new pcm: 04 yukon with seg swap to 80e
stock 4l80e neutral switch: no
shifter:b&m quick silver (park switch wired to the factory clutch switch)
so before the swap the starter would work just fine.now i get nothing from trying to start it with the key. i have done the key relearn already and the car will run just fine if i leave the key in "run" and jump the starter.
i think i must have missed something in the swap wiring. maybe something in the pin outs between the 2 ecus?
car:04 cts-v (t56)
new tranny: 4l80e
harness: speartech add on
new pcm: 04 yukon with seg swap to 80e
stock 4l80e neutral switch: no
shifter:b&m quick silver (park switch wired to the factory clutch switch)
so before the swap the starter would work just fine.now i get nothing from trying to start it with the key. i have done the key relearn already and the car will run just fine if i leave the key in "run" and jump the starter.
i think i must have missed something in the swap wiring. maybe something in the pin outs between the 2 ecus?
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Joined: Aug 2010
Posts: 7,323
Likes: 529
From: Ann Arbor, MI
Since no one has replied, let me take a shot. Disclaimer: I have no experience with your vehicle.
Many vehicles run the starter solenoid signal through the Park/Neutral safety switch mounted on the side of the trans. Since your CTS-V started with a manual trans, the wiring will be a bit different than with an auto. While you could bypass the safety switch, it is very dangerous to especially kids and property. You may therefore want to add a 4L80E safety switch to your trans and wire that into the two lines that used to go to your clutch switch. The B&M shifter only grounds one signal in Park/Neutral; it is not really setup to pass the starter solenoid signal through it. Alternatively, if you are comfortable with electrical stuff, the B&M shifter could activate a relay which then closes the circuit from the ignition key to the starter solenoid. Check with Speartech too.
Again, I am guessing at how your car might be wired. Perhaps someone else has more precise ideas.
Finally, please update this post when you solve the problem.
Many vehicles run the starter solenoid signal through the Park/Neutral safety switch mounted on the side of the trans. Since your CTS-V started with a manual trans, the wiring will be a bit different than with an auto. While you could bypass the safety switch, it is very dangerous to especially kids and property. You may therefore want to add a 4L80E safety switch to your trans and wire that into the two lines that used to go to your clutch switch. The B&M shifter only grounds one signal in Park/Neutral; it is not really setup to pass the starter solenoid signal through it. Alternatively, if you are comfortable with electrical stuff, the B&M shifter could activate a relay which then closes the circuit from the ignition key to the starter solenoid. Check with Speartech too.
Again, I am guessing at how your car might be wired. Perhaps someone else has more precise ideas.
Finally, please update this post when you solve the problem.
