Question:
What causes the transmission code "TCM relay always on". the car is a 2002 Hyundai Sonata 4cyl auto. . were is the TCM relay located?
Answer:
The relay is located behind the radio/HVAC stack. There are two causes possible for this code, one the relay is really stuck on, the other is the harness is frayed in the transmission valve body. There is a TSB regarding this code.
If the fuse is blown for the trans controller (fuse #6) the harness in the trans is likely shorting. Check this first.
If the fuse is blown for the trans controller (fuse #6) the harness in the trans is likely shorting. Check this first.
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