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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TopScan
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ArtiLink600
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Parts & Tools for This Job
Common parts shoppers buy for P0720 Output Speed Sensor Circuit.
Transmission Fluid
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Transmission Filter
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Shift Solenoid
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Torque Converter
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OBD2 scanner
Read codes and freeze-frame data before you guess at the fault.
Most diagnostic jobs start with a scan tool and a verified code path.
Check SpecificationsBattery tester
Check cranking and charging health before replacing expensive parts.
A weak battery can mimic alternator or starter problems.
Check SpecificationsMultimeter kit
Confirm voltage, continuity, and sensor power with one simple kit.
A meter is the cheapest way to rule out a bad circuit fast.
Check SpecificationsRelated Resources
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
Published by AllOEMManuals, founded by Lyndon Bedford, an automotive technician with 20 years of experience. He owned and operated a mechanic shop in Hurst, Texas from 2014 to 2022 and continues hands-on repair work.
Content may combine manual references, general repair templates, and AI-assisted drafting. Confirm the source, vehicle configuration, and applicability before working. Report corrections through our contact page.
Last updated: 2026-10-29