Do these 3 things before closing this tab:
1Clear out junk files and repair common Windows errors2Scan for outdated or missing drivers - takes under a minute3Repair Windows errors before they cause bigger problemsP0720 generally points to a problem with the transmission output speed sensor signal or its circuit. It does not, by itself, prove the sensor has failed. Wiring, connectors, power or ground, a control module, and—in some vehicles—a sensor rotor or internal transmission issue can also set the code. The correct diagnosis and test values depend on the vehicle’s year, make, model, and transmission.
What does the P0720 code mean?
P0720 is generally associated with an abnormal, missing, or implausible signal from the transmission output speed sensor or its circuit. The sensor reports output-shaft speed to the vehicle’s control electronics, which use that information as part of transmission and vehicle-speed operation.
The wording is not identical across manufacturers. Ford’s On Board Diagnostics II PCED describes P0720 as “Insufficient input from Output Shaft Speed sensor,” while Mitsubishi and Nissan service procedures refer to an output speed sensor system or sensor fault. Those descriptions are examples for particular vehicles, not a universal definition of the exact electrical fault or failed part. See the Ford On Board Diagnostics II PCED, Mitsubishi output shaft speed sensor system procedure, and Mitsubishi output speed sensor malfunction procedure.
What symptoms can P0720 cause?
Symptoms vary by vehicle and by the nature of the fault. A vehicle may store P0720 without showing every symptom, and a listed symptom can have other causes.
What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
#1 Best Overall
- CEL Doctor: The ANCEL AD310 is one of the best-selling OBD II scanners on the market and is recommended by Scotty Kilmer, a YouTuber and auto mechanic. It can easily determine the cause of the check engine light coming on. After repairing the vehicle's problems, it can quickly read and clear diagnostic trouble codes of emission system, read live data & hard memory data, view freeze frame, I/M monitor readiness and collect vehicle information
- Sturdy and Compact: Equipped with a 2.5 foot cable made of very thick, flexible insulation. It is important to have a sturdy scanner as it can easily fall to the ground when working in a car. The AD310 OBD2 scanner is a well-constructed mechanic tool with a sleek design. It weighs 12 ounces and measures 8.9 x 6.9 x 1.4 inches. Thanks to its compact design and light weight, transporting the device is not a problem. The buttons are clearly labelled and the screen is large and displays results clearly
- Accurate Fast and Easy to Use: The AD310 scanner can help you or your mechanic understand if your car is in good condition, provides exceptionally accurate and fast results, reads and clears engine trouble emission codes in seconds after you fixed the problem. This device will let you know immediately and fix the problem right away without any car knowledge. No need for batteries or a charger, get power directly from the OBDII Data Link Connector in your vehicle
- OBDII Protocols and Car Compatibility: Many cheap scan tools do not really support all OBD2 protocols. AD310 scanner as it can support all OBDII protocols such as KWP2000, J1850 VPW, ISO9141, J1850 PWM and CAN. This device also has extensive vehicle compatibility with 1996 US-based, 2000 EU-based and Asian cars, light trucks, SUVs, as well as newer OBD2 and CAN vehicles both domestic and foreign. Pls confirm with our customer service whether it is compatible with your vehicle before purchasing
- Home Necessity and Worthy to Own: This is an excellent code reader to travel or home with as it weighs less and it is compact in design. You can easily slide it in your backpack as you head to the garage, or put it on the dashboard, this will be a great fit for you. The AD310 is not only portable, but also accurate and fast in performance. Moreover, it covers various car brands and is suitable for people who just need a code reader to check their car
- Erratic, harsh, delayed, or otherwise abnormal shifting
- An inaccurate or nonworking speedometer
- Reduced-power or limp mode
- A check-engine warning, and in some cases ABS or traction-control warnings
These are possible signs, not a guaranteed symptom list for every vehicle; see the OBD2.com P0720 overview.
What can cause P0720?
The code identifies a signal or circuit problem to investigate; it does not rank the likely causes for every vehicle. Manufacturer diagnostic procedures identify several possibilities:
Rank #2
- Understand Your Check Engine Light – The ANCEL AD410 OBD2 scanner helps everyday drivers quickly read and clear engine-related fault codes, view code definitions, and understand why the check engine light is on before visiting a repair shop. With 42,000+ built-in DTC lookups, this car code reader helps reduce guesswork and makes basic vehicle diagnostics easier for beginners and DIY users
- Full OBD2 Diagnostics Made Simple – More than a basic engine code reader, this OBD2 scanner diagnostic tool supports key OBDII functions including reading/clearing codes, live data, freeze frame, I/M readiness, O2 sensor test, EVAP test, vehicle information, and MIL status. It helps you check your car’s condition, verify repairs after the issue is fixed, and communicate with mechanics more confidently
- Live Date & Real-time Vehicle Insights – View real-time engine data such as RPM, coolant temperature, fuel trim, oxygen sensor readings, and other available OBD2 parameters directly on the screen. These live data readings help you better understand how your vehicle is running, spot abnormal patterns, and make more informed repair decisions instead of relying only on a warning light
- Smog Check Readiness At A Glance – Use the I/M readiness function before a smog check or emissions inspection to see whether your vehicle’s monitors are ready. This OBD2 code scanner helps you confirm if recent repairs have brought the system back to a ready state, reducing the chance of failed inspections, retests, wasted trips, and unnecessary inspection fees
- Works With Most OBD2 Vehicles – Compatible with most 1996 and newer U.S.-based OBD2 cars, SUVs, and light trucks, as well as many 2000 and newer EU/Asian OBD2 vehicles. Supports major OBDII protocols including CAN, ISO9141, KWP2000, J1850 VPW, and J1850 PWM. This automotive diagnostic scanner is designed for wide vehicle coverage; please check compatibility with your vehicle before purchase
- A failed output speed sensor
- A loose, damaged, corroded, open, or shorted connector or harness
- A problem with sensor power, ground, or signal wiring
- A control-module fault, considered after the sensor and circuit checks prescribed for the vehicle
- On some applications, a sensor rotor or an internal transmission fault
Ford’s diagnostic material includes OSS circuit, sensor, and PCM possibilities; Mitsubishi procedures include the harness, sensor, TCM, and—in one application—the rotor. The Nissan Juke service procedure also checks the sensor’s power and ground, TCM input, and harness. See the Ford PCED, Mitsubishi system procedure, and Nissan Juke service-manual reproduction. The Nissan procedure is specific to that application; verify any procedure against authoritative service information for your own vehicle.
How do you diagnose and fix P0720?
Use the diagnostic procedure for the exact year, make, model, and transmission. Connector pinouts, voltage thresholds, scan-tool data, test conditions, and sensor fitment are not interchangeable. For example, one Mitsubishi procedure checks connector condition and wiring, verifies supply, and then evaluates sensor output with an oscilloscope under specified conditions; it calls for sensor replacement only if the signal test fails. That sequence illustrates the approach, but its readings and conditions must not be applied to another vehicle.
Quick wins for a faster PC:
Scan for outdated or missing drivers - takes under a minuteDriver Scan →Clear out junk files and repair common Windows errorsFree Scan →Rank #3
- 【A MUST-HAVE SCANNER TOOL FOR DIYERS】 - VDIAGTOOL VD10 car code reader is an incredibly useful, handheld obd2 scanner for each car owner or hobbyist, even for those with little to no experience when it comes to vehicle mechanics! Similar to a fixd car diagnostic tool, using this car diagnostic scanner is extremely easy. All you have to do is attach it to your car OBDII port and you can diagnose car problems in seconds! Read Codes (DTCs); Clear Codes; Live Data; View Freeze Frame; I/M Readiness; Vehicle Information.
- 【KEEP ENGINE IN GOOD STATUS】 - VDIAGTOOL check engine code reader brings a fast access to scan, read the car fault code, show its definition on the screen instantly, troubleshooting to find the root causes of problems, erase the engine fault code and turn off the MIL (Malfunction Indicator Light). Similar to a fixd car diagnostic tool, this car code reader helps ensure your engine stays in top condition.
- 【READ/CLEAR CODES & DTC LOOKUP】- No search online & saving your time, this vehicle car code reader retrieves generic (P0, P2, P3, and U0), manufacturer specific (P1, P3, and U1) codes, pending codes and displays DTC definitions based on the built-in database(more than 3000 codes) on the TFT screen, find out the root causes and clear the codes after fixed.
- 【ENHANCED OBD2 SCANNER WITH LIVE DATA & RETRIEVE FREEZE FRAME】 - This diagnostic scan tool for accurate diagnosis enables you to retrieve data from vehicle sensors, such as Engine RPM, Intake air temperature, Short/Long term fuel, Misfire data and etc. The freeze frame is stored in the PCM together with the diagnostic trouble code (DTC) related to the fault. Comparable to a fixd car diagnostic tool, the VD10 car code reader car scanner can be a valuable & practical diagnostic aid and also greatly help when diagnosing intermittent problems.
- 【I/M READINESS for THE S-nn-0-g CHECK】- OBDII vehicle may not pass the annual inspection unless the required monitors since reset are complete. So you should at least read the readiness monitors and make sure they are ready. This car obd2 scanner diagnostic tool is equipped with I/M readiness function to check the operations of the e-m-issi0n system on OBD2 compliant vehicles, run I/M monitor readiness test, checking if the pass vehicle s-m-0-g inspection.
- Record the codes and symptoms. Use an OBD-II scanner to retrieve stored codes and note what the vehicle does. A basic code reader may not provide transmission data, and retrieving P0720 alone does not identify the failed component.
- Find the vehicle-specific test procedure. Confirm the application and transmission, then consult the relevant service information for the correct connector, test points, expected values, and verification steps.
- Inspect the connector and harness. Look for damage, corrosion, poor connections, or wiring problems, following the vehicle’s service procedure and safe access practices.
- Test the circuit and sensor signal as directed. The applicable procedure may call for checking supply, ground, continuity, and signal, and may require live scan data or an oscilloscope. Use only the specified test conditions and thresholds.
- Repair the fault established by testing. Repair wiring or connector problems, replace the sensor only if its test fails, or continue the prescribed diagnosis if circuit checks point toward a module or mechanical issue.
- Clear and verify the repair. Recheck the code using the vehicle’s prescribed verification procedure; a code that returns needs further diagnosis.
If you cannot safely access the sensor or do not have the required scan and electrical test equipment, a qualified repair shop or transmission specialist can perform the model-specific checks. Do not substitute generic pin numbers or voltage values for the vehicle’s service information.
Can you drive with P0720?
The code alone cannot establish whether a particular vehicle is safe to drive. If the vehicle shifts harshly, loses its speed indication, enters limp mode, or behaves unpredictably, stop driving when it is safe to do so and arrange prompt inspection. Possible shifting and speedometer problems make extended driving unwise; the general symptom guidance is described by OBD2.com.
Rank #4
- 【Diagnose Check Engine Light in Seconds – No Mechanic Needed】The FOXWELL NT301 OBD2 scanner instantly reads & clears engine fault codes (DTCs) with one click. Simply plug into the 16-pin DLC port, turn ignition on, and get accurate results within seconds—No prior car knowledge required. Save hundreds on dealership fees by knowing exactly what’s wrong before you visit a shop. The #1 choice car scanner for DIYers and car owners who want to take control of their vehicle’s health
- 【Clear & Reset CEL with Confidence】Unlike cheap code readers that just erase codes temporarily, NT301 works like all professional vehicle code readers: It clears the check engine light only after you’ve fixed the underlying issue. If the problem isn’t fully repaired, the fault code will reappear. So you’ll never get a false pass. Use the foxwell scanner to verify your repair work and drive with peace of mind
- 【Sm-og Check Helper – Know Your Pass/Fail Status Before the Test】With dedicated one-click I/M readiness hotkeys and a simple Red-Yellow-Green LED indicator, you’ll instantly know if your vehicle is ready for annual testing. Built-in speaker provides clear audio feedback. No guesswork—just confidence before you head to the test center. One less thing to worry about when inspection day comes
- 【Advanced OBDII Modes – O- 2 Sensor & EVAP Testing】NT301 go beyond basic code reading with enhanced OBD2 modes. Run an EVAP system check to assess fuel tank condition, and use the O- 2 sensor test to optimize air-fuel ratio, boosting fuel economy, cutting em- issions, and saving you money at the pump. The code reader for cars and trucks is like having a mini em-issions lab in your glove box
- 【Live Data Graphing – Spot Engine Issues in Real Time】View and log live sensor data in easy-to-read graphs with this OBD2 scanner diagnostic tool. Monitor ox- ygen sensors, fuel trims, coolant temperature, RPM, and more to spot suspicious values instantly. This obd scanner gives you professional-grade insight without the pro price tag—a feature you won’t find on basic $20 car code readers
Does P0720 mean the output speed sensor is bad?
No. It means the vehicle has detected a fault associated with the output-speed-sensor signal or circuit, under that vehicle’s own diagnostic logic. A failed sensor is one possible cause, but a connector, harness, power or ground fault, control module, or—on some vehicles—a rotor or internal transmission problem may also be involved. Confirm the cause with the vehicle-specific tests before buying or replacing a sensor.
Quick Recap
Best Value
- [Easy to Use—Work Out of the Box] + [FOXWELL 2026 New Version] FOXWELL NT604 Elite scan tool is the 2026 new version from FOXWELL, designed for car owners who want to figure out the cause of issues before fixing car problems by scanning common systems like ABS, SRS, engine, and transmission. The NT604 Elite obd2 scanner diagnostic tool comes with the latest software—no need to waste time downloading software first. Plug the scanner into the OBDII port with OBDII cable to start the diagnosis.
- [Affordable] + [Reliable Car Health Monitor] Will you be confused what happens when the warning light of ABS/SRS/transmission/check engine flashes? Instead of taking your cars to dealership, this FOXWELL scanner will help you do a thorough scanning and detection for your cars and pinpoint the root cause. Note：The device is a diagnostic tool, not a repair tool. To turn off a warning light, you must first physically repair the issue causing it. Only then can the scanner be used to clear the corresponding fault code.
- [5 in 1 Car Diagnostic Scanner] Compared with obd scanners (50-100), NT604 Elite code scanner not only includes their OBDII diagnosis but also serves as ABS/SRS scanner, transmission and check engine code reader. When it’s an odb2 scanner, you can use it to check if your car is ready for annual test through I/M readiness menu. In addition, live data stream, built-in DTC library, data play back and print, all these features are a big plus for it. Note: doesn't support maintenance functions like reset or relearn. For the SRS system, NT604 Elite can read and clear common fault codes not caused by a crash, but crash/collision data cannot be cleared.
- [Fantastic AUTOVIN] + [No extra software fee] Through the AUTOVIN menu, this NT604 Elite car scanner allows you to get your V-IN and vehicle info rapidly, no need to take time to find your V-IN and input one by one. What's more, the NT604 Elite ABS SRS scanner supports 60+ car brands from worldwide (America/Asia/Europe). You don’t need to pay extra software fee. AUTOVIN may not work on some older vehicles or certain vehicle brands. If AUTOVIN fails, please input the vin code manually or go to the Diagnostic Menu to select your vehicle model.
- [Solid protective case KO plastic carrying bag] + [Lifetime update] Almost all same price-level car scanner diagnostic tool only offers plastic bag to hold the scanner.However, NT604 Elite automotive scanner is equipped with solid protective case, preventing your obd2 scanner from damage. Then you don’t need to pay extra money to buy a solid toolbox.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
