P0720: Output Shaft Speed Sensor Circuit
What Does P0720 Mean?
P0720 is a diagnostic trouble code indicating: Output Shaft Speed Sensor Circuit. This code relates to the transmission system. It has been reported in NHTSA complaints across 8 different vehicle models.
The automatic transmission is controlled by the TCM using input from speed sensors, temperature sensors, and pressure sensors. When the TCM detects a fault, it may activate limp mode (2nd or 3rd gear only). Shift solenoids are electromagnetic valves inside the valve body controlling hydraulic fluid flow. Modern transmissions use 4-8 solenoids in combination for each gear. Solenoid failures are often caused by contaminated fluid — worn clutch material and degraded fluid create varnish that sticks solenoids. Always check transmission fluid first: level, color (red/pink good, brown/black bad), and smell (burnt = internal damage). Transmission DTCs escalate fast — a $200 solenoid fix can become a $3000-$5000 rebuild if ignored.
Symptoms of P0720
- ⚠️ Check engine/transmission warning light on
- ⚠️ Harsh, delayed, or erratic shifting
- ⚠️ Transmission stuck in one gear (limp mode)
- ⚠️ No upshift or no downshift
- ⚠️ Transmission slipping
- ⚠️ RPM flares between shifts
Common Causes
- 🔍 Faulty shift solenoid
- 🔍 Contaminated transmission fluid
- 🔍 Wiring issue between TCM and solenoid
- 🔍 Valve body wear
- 🔍 TCM internal failure
P0720 Reports by Year
Real Owner Reports
From NHTSA complaint database — actual owner descriptions.
"The contact owns a 2012 Ford Mustang. The contact stated that while driving 55 MPH, the transmission unexpectedly downshifted to first gear and the vehicle's rear tires ceased. Additionally, the speedometer failed. The air bag warning light, the traction control warning light and the check engine wa"
— Ford Mustang owner, 03/24/2023
"I have a 2013 Ford Mustang V6 coupe with Automatic transmission. I purchased the car Certified Pre Owned through Ken Grody Ford in Carlsbad, CA with Less then ~11,000 miles on it in 2/2014. I have been complaining of a jerk/ knock at ~ 1-1.6 RPM’s when idling & driving in stop and go traffic/ off r"
— Ford Mustang owner, 09/05/2022
"IN A NUT SHELL, LOOK UP FORD TSBS: 13-4-9 AND 13-6-8. 2013 MUSTANG, 65,700 MILES, WITH 6-SPEED AUTO (6R80) TRANSMISSION WILL SUDDENLY GET STUCK IN 5TH GEAR WHEN STARTING OR WHEN CRUISING AT HIGHWAY SPEEDS. VERY DANGEROUS WHEN PULLING OUT INTO TRAFFIC OR AN ON-RAMP AND SUDDENLY STUCK IN 5TH GEAR W"
— Ford Mustang owner, 10/03/2019
Source: NHTSA Complaints Database
Most Reported Vehicles for P0720
Based on NHTSA owner complaint data.
| # | Vehicle | Reports |
|---|---|---|
| 1 | FORD MUSTANG | |
| 2 | FORD EXPEDITION | |
| 3 | FORD EDGE | |
| 4 | CHRYSLER PACIFICA | |
| 5 | NISSAN SENTRA | |
| 6 | NISSAN TITAN | |
| 7 | NISSAN VERSA | |
| 8 | SUBARU OUTBACK |
P0720 Reports by Vehicle
Detailed NHTSA complaint analysis for each vehicle model.
Diagnostic Tips
- Check fluid level and condition FIRST
- Multiple codes suggest valve body or internal damage
- Monitor solenoid duty cycle with scan tool
- Solenoids often accessible by removing pan
Common Mistakes to Avoid
- ❌ Replacing solenoid without flushing contaminated fluid
- ❌ Using aftermarket fluid instead of manufacturer-specified
- ❌ Driving in limp mode for extended periods
Frequently Asked Questions
What is a shift solenoid?
Can I drive in limp mode?
How much for solenoid replacement?
Can fluid change fix it?
Reported Repair Costs for P0720
Based on 4 owner-reported repair costs from NHTSA complaints.
⚠️ These are owner-reported costs, not estimates. Actual costs vary by location, labor rates, and root cause. Source: NHTSA complaints database.
What To Do Next
Possible Fixes
- 🔧 Replace shift solenoid or pack
- 🔧 Transmission fluid flush with manufacturer fluid
- 🔧 Repair wiring to transmission
- 🔧 Replace valve body
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1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
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2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
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Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.