Trans light stays on even after replacing Trans relay. Drove the vehicle and it shifts perfectly, what can be causing the light to stay on?
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I did that before replacing the relay and it gave me normal codedso I replaced the relay and I still get the trans light when ignition is off.truck off.
open extra port on front of TCM (under left rear seat).
Bend a paperclip and stick the ends into A and E. One of the other holes is hot, so aim good.
Get pen and paper.
Turn start switch to run position, watch light. It will blink a series of numbers. Write them down. It will do each code 3 times.
it will blink 1-2-1-2-1-2. That is 12, codes will blink next, if any. Then follow with 1-2-1-2-1-2, then repeat again.
If the engine is cold, you can unplug the TSU or GPC to stop the glow plugs from warming up.
Tell us what codes you get.
IGN OFF. I missed that part.I did that before replacing the relay and it gave me normal codedso I replaced the relay and I still get the trans light when ignition is off.