OBD
P0737
TCM Engine Speed Output Circuit
What it means
P0737 means TCM Engine Speed Output Circuit.
Check these first
- A failed TCM
- Corrosion in the TCM engine speed output wiring
- A failing crankshaft position sensor
- A poor TCM ground
- A PCM communication fault
What to do next
- Read the engine speed signal at the TCM on a scan tool
- Inspect the TCM output wiring for corrosion
- Test the crankshaft position sensor signal
- Check the TCM and PCM grounds
- Replace the TCM if the output stays dead
- Clear the code and retest
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Updated
Generic SAE J2012 definition. Last updated 2026-10-10.