Fault-Code Library · Automatic transmission
P0720: Output speed sensor circuit malfunction
The transmission controller does not receive a plausible output shaft speed signal.
Common symptoms
- •Harsh shifts
- •No speed signal
- •Limp mode
- •Incorrect gear changes
Likely causes
- •Failed output speed sensor
- •Wiring or connector damage
- •Internal transmission sensor fault
- •Control module issue
First checks
- •Scan the transmission module
- •Compare input and output speed data
- •Inspect connector, wiring, and fluid contamination where applicable
Important
Transmission speed sensor faults need module data because symptoms can mimic internal gearbox wear.
A fault code identifies a detected condition, not a failed part. Confirm manufacturer-specific subcodes and live data.
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