P0720
High SeverityOutput Speed Sensor Circuit
Transmission System
P0720 — Instant Answer
Output Speed Sensor Circuit
Severity: HIGH SEVERITY
Meaning: No signal from the transmission output speed sensor.
Safe to drive? NO if CEL is flashing. YES with caution if solid, but repair this week.
Estimated repair cost: $20 - $60
Most common causes:
- 1. Failed output speed sensor (35-45% of cases)
- 2. Wiring issue (10-25% of cases)
Symptoms
- ⚠️No speedometer
- ⚠️Harsh shifting
- ⚠️Limp mode
Common Causes
How to Diagnose P0720
- 1Check sensor connector
- 2Test sensor
- 3Replace sensor
OEM Procedures for P0720
P0720 affects the Transmission. Found 1,512 OEM service manual procedures.
00 Complete Transmission - 23 00 036 Installing replacement transmission (GS6-37BZ/DZ)
00 Complete Transmission - 23 00 036 Installing replacement transmission (GS6-37BZ/DZ)
00 Complete Transmission - 23 00 036 Installing replacement transmission (GS6-37BZ/DZ)
00 Complete Transmission - 23 00 036 Installing replacement transmission (GS6-37BZ/DZ)
00 Complete Transmission - 23 00 036 Installing replacement transmission (GS6-37BZ/DZ)
00 Complete Transmission - 23 00 036 Installing replacement transmission (GS6-37BZ/DZ)
00 Complete Transmission - 23 00 037 Installing Replacement Transmission (GS6-53BZ/DZ)
00 Complete Transmission - 23 00 037 Installing Replacement Transmission (GS6-53BZ/DZ)
Showing 8 of 1,512 procedures
OEM Diagnostic Flowchart
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Repair guides, symptom pages, and wiring diagrams related to P0720.
OEM Manual Evidence
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Exact Vehicle Hubs
Browse →Open the exact vehicle hub grounded by OEM manual evidence related to P0720.
Open the exact vehicle hub grounded by OEM manual evidence related to P0720.
Open the exact vehicle hub grounded by OEM manual evidence related to P0720.
Open the exact vehicle hub grounded by OEM manual evidence related to P0720.
Related Codes
No signal from the transmission input speed sensor.
The ECM is not receiving a proper vehicle speed signal. Affects speedometer, ABS, and transmission shift points.
The TCM (Transmission Control Module) has detected a fault and sent a message to the ECM. This is a general indicator that transmission-specific codes are stored.
Frequently Asked Questions
- Is the output speed sensor the same as the vehicle speed sensor?
- On some vehicles, yes. On others, they are separate sensors.
- Can this affect the speedometer?
- Yes — the output speed sensor is often used for speedometer calculations.
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Author & Review
Written by AllOEMManuals Editorial Team. Reviewed by ASE-certified technicians and updated with factory-reference checks for fitment-sensitive steps.
This guide was drafted with AI assistance and reviewed for accuracy by a human editor.
Last updated: 2026-05-07