P0739Mazda Cx-9Years: 1996 - 2026
TCM Engine Speed Output Circuit (P0739)
Reviewed by ASE Certified Technician
What does this mean?
Code P0739 indicates a problem with the TCM engine speed output circuit.
Disclaimer: This diagnostic code is part of the standard OBD2 system and can apply to Mazda Cx-9 models manufactured from 1996 to 2026. However, please note that the presence of this specific code depends on your vehicle's exact engine configuration, options, and production year.
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Common Causes
Internal PCM/ECM failure
Damaged, chafed, or broken wiring harness
Corroded or loose electrical connector
Symptoms to Watch For
- Check Engine Light is illuminated
- Hard or harsh gear shifting
- Transmission slipping between gears