Your check engine light suddenly pops on, and after scanning your OBD-II reader, you’re faced with a cryptic code: P0720. If you drive a Nissan—whether it’s an Altima, Sentra, Rogue, or Pathfinder—this code is more than just a minor nuisance. It’s often the first warning sign of a deeper issue within your transmission system, particularly the CVT (Continuously Variable Transmission), which has been the subject of numerous reliability discussions in recent years.
The P0720 Nissan code refers specifically to the “Output Speed Sensor Circuit Malfunction.” In plain terms, your car’s transmission is having trouble reading how fast it’s spinning. That sensor is critical to helping your vehicle shift gears smoothly and efficiently. If it’s not functioning correctly, you may experience harsh shifting, hesitation, or even find yourself stuck in limp mode. More importantly, ignoring this issue could lead to more serious transmission problems, which we covered in detail in this article about Nissan CVT transmission problems.
Given how common this issue is across various Nissan models equipped with CVT gearboxes, it’s essential for owners to understand not only what this code means, but why it occurs, how to identify its symptoms, and what steps to take next—whether you’re a DIY mechanic or relying on a trusted shop.
In this guide, we’ll break down everything you need to know about the P0720 Nissan code—from causes to symptoms to reliable fixes. You’ll also learn how this ties into broader CVT concerns that Nissan owners frequently report. And if you’re wondering whether it’s time to worry about your transmission’s reliability, this related guide might help clarify: Are Nissan CVT Transmissions Reliable?
What Is the P0720 Nissan Code?
The P0720 Nissan code is part of the standardized OBD-II diagnostic system used in most modern vehicles. Specifically, this code indicates a malfunction in the Output Speed Sensor circuit, which plays a vital role in how your Nissan’s transmission communicates with the engine and the vehicle’s computer.
To break it down: your Nissan transmission, particularly if equipped with a CVT (Continuously Variable Transmission), relies on multiple sensors to monitor and adjust shift timing, torque distribution, and throttle response. One of the most critical of these is the Output Speed Sensor (OSS), which measures how fast the transmission’s output shaft is spinning. This data is used by the Transmission Control Module (TCM) to determine appropriate shift points and ensure optimal driving performance.
When the OSS fails or returns inconsistent signals, the onboard diagnostics system triggers P0720. This isn’t just a theoretical fault—it directly affects driveability, fuel efficiency, and, over time, can contribute to serious transmission damage if left unresolved.
It’s important to understand that P0720 doesn’t always mean the sensor itself is faulty. It could be a wiring issue, a damaged connector, or even a failing transmission control module (TCM). In some cases, the issue may originate from irregularities in transmission fluid levels or quality—especially in Nissan CVTs, where fluid degradation is a known problem. For more insight into this, check out the dedicated article on Nissan CVT transmission problems.
Certain models—like the Nissan Altima (2007–2012), Sentra, and Rogue—are more prone to this issue, particularly as they age or accumulate higher mileage. If you drive one of these, understanding where the speed sensor is located and how it functions is a good starting point. We recommend reviewing this detailed guide: Nissan CVT Transmission Speed Sensor Location
Common Causes of the P0720 Nissan Code
Understanding the root causes behind the P0720 Nissan code is crucial not only for effective troubleshooting but also to prevent repeat failures—especially in vehicles equipped with Nissan’s CVT transmissions, which are known for being both sensitive and expensive to repair.
At its core, the P0720 code is triggered when there’s a disruption in the signal from the output speed sensor (OSS) to the Transmission Control Module (TCM). While this might sound straightforward, the actual list of potential causes is more complex and multi-layered.
🔧 1. Faulty Output Speed Sensor
The most obvious cause is a failed or malfunctioning sensor. Over time, the OSS can wear out, especially in vehicles frequently driven under heavy load, in stop-and-go traffic, or in extreme weather conditions. The sensor may either send erratic signals or no signal at all, confusing the TCM and triggering the code.
🔌 2. Damaged or Corroded Wiring / Connectors
Even if the sensor itself is in working order, the wiring that carries its signal to the TCM can become frayed, corroded, or disconnected. Exposure to moisture, heat, and engine vibration increases the risk. Poor grounding or oxidized connectors can cause voltage drops and communication issues.
💧 3. Low or Contaminated Transmission Fluid
Nissan’s CVT systems are especially sensitive to fluid quality. Old or dirty transmission fluid can disrupt the internal hydraulic pressure, affecting sensor readings and gear engagement. This is a common issue discussed in-depth in Nissan CVT Transmission Problems, where owners report similar symptoms before the P0720 code is even logged.
🧠 4. Failing Transmission Control Module (TCM)
Though less common, a defective or buggy TCM can misinterpret sensor signals—even if the sensor and wiring are fine. This usually occurs alongside other codes and erratic shifting behavior, and might require reprogramming or replacement of the TCM.
⚙️ 5. Internal Transmission Wear or Failure
In more serious cases, internal components such as clutches, bands, or solenoids inside the CVT unit can wear out or seize, indirectly affecting the OSS readings. This tends to happen in higher mileage vehicles, or when routine maintenance is neglected.
Symptoms of a P0720 Code in a Nissan
When the P0720 code appears in your Nissan vehicle, it’s rarely a silent warning. Most drivers begin to notice subtle changes in how the car drives—sometimes without realizing these are early signs of a failing output speed sensor or related transmission issue. Spotting these symptoms early can save you from more expensive repairs down the road, especially in models with CVT transmissions, which are more sensitive to component failures.
🚨 1. Check Engine Light (CEL) Illuminated
The most immediate symptom is the check engine light turning on. While this can be triggered by dozens of potential issues, when paired with transmission-related symptoms, it’s often the first clue of a P0720 code.
⚙️ 2. Harsh or Erratic Shifting
Since the output speed sensor plays a crucial role in determining shift timing, any disruption can cause your Nissan to:
- Shift too early or too late
- Jerk or lurch between gears
- Stay stuck in one gear (often second or third)
This is especially noticeable in CVT-equipped models, where the transition between power ranges is supposed to be smooth. If your Nissan suddenly feels “confused” during acceleration, P0720 may be behind it. You can read more about how CVT quirks manifest in Nissan CVT Transmission Problems.
🧊 3. Limp Mode Activation
Some drivers report their vehicles going into “limp mode”, a fail-safe state where power is drastically reduced to protect the engine and transmission. In this mode:
- RPMs are limited
- Shifting may be disabled
- Acceleration becomes sluggish
This is a strong signal that the TCM is not receiving valid speed data and has defaulted to safety protocols.
🎛️ 4. Inaccurate or Non-Functional Speedometer
In rare cases, the vehicle’s speedometer may behave erratically, jump between readings, or stop working entirely. While this is more common with a VSS (Vehicle Speed Sensor) fault, an OSS error like P0720 can produce similar side effects depending on the vehicle’s data-sharing architecture.
👂 5. Unusual Noises or Vibrations During Acceleration
Some owners report a low humming, whining, or grinding noise from the transmission area, particularly when the vehicle is accelerating. These sounds may not always be directly tied to the OSS, but they often occur in conjunction with fluid issues or early CVT wear.
Is It Safe to Drive With the P0720 Code?
The moment your vehicle flashes the P0720 code, the big question arises: Can I keep driving, or am I risking serious damage? The short answer? It depends — on the symptoms, your driving conditions, and how quickly you’re able to address the issue.
Let’s break it down.
When It Might Be Safe to Drive (Temporarily)
If your only symptom is a check engine light and your Nissan is still driving smoothly—with no unusual shifts, no limp mode, and no speedometer issues—you may be able to drive short distances. Think of this like a yellow flag rather than a red light. However, this doesn’t mean the problem should be ignored. The sensor could be intermittently failing, and waiting too long may escalate the issue.
In fact, even a short drive under strain—like climbing hills, hauling passengers, or driving in hot weather—could push your CVT transmission over the edge. And as discussed in this overview of common CVT problems, delayed repairs often lead to major mechanical failures.
When You Should Stop Driving Immediately
If your vehicle exhibits any of the following, pull over and seek service:
- Transmission is slipping or not shifting
- Acceleration is inconsistent or sluggish
- The car enters limp mode
- Warning lights flash alongside the CEL (like TCS or ABS)
- Speedometer malfunctions or drops to zero
These aren’t just inconvenient—they’re signs your Nissan’s transmission control system is receiving unreliable data and could fail suddenly. Losing gear control while on the highway or in city traffic creates a serious safety risk.
Bottom Line
Driving with the P0720 code may seem manageable at first, but it’s not worth gambling your safety—or your wallet. Transmission repairs, especially for Nissan CVTs, can cost thousands. The earlier you act, the more likely it is that a simple sensor replacement or wiring fix will solve the problem.
How to Diagnose the P0720 Code
Before you spend hundreds of dollars replacing parts or booking time at a transmission shop, it’s worth knowing that the P0720 Nissan code can often be diagnosed with a few basic tools and a methodical approach. Whether you’re a DIYer or just want to understand what your mechanic is doing, here’s a clear breakdown of how to properly diagnose this error.
Step 1: Use an OBD-II Scanner
Start with a reliable OBD-II code reader—even a basic one will confirm whether P0720 is present. More advanced scanners will allow you to:
- Check live data from the output speed sensor
- See if the OSS and VSS (vehicle speed sensor) readings match
- Check for other associated codes (P0715, P0841, etc.)
This gives you a full picture of the issue, especially if the OSS signal is intermittently dropping out.
Step 2: Inspect the Wiring and Connectors
Pop the hood and visually inspect the speed sensor wiring:
- Look for broken, frayed, or melted wires
- Check for corroded or loose connectors
- Wiggle the harness gently and monitor scanner data to see if readings fluctuate
Often, the issue isn’t the sensor—it’s a damaged wire or poor ground.
Step 3: Test the Output Speed Sensor (OSS)
If wiring checks out, test the OSS using a multimeter:
- Disconnect the sensor
- Measure resistance (Ohms) across the terminals
- Compare to the manufacturer’s spec (usually between 500–1500 Ohms)
A reading far outside this range usually means the sensor is bad.
Step 4: Check Transmission Fluid
Low or dirty transmission fluid can cause false readings or delayed shifts, especially in CVT models. Check for:
- Correct fluid level (with engine running)
- Fluid color: should be clean, red or amber—not dark or burnt-smelling
If needed, consider a full fluid replacement, but always use CVT-specific fluid compatible with Nissan models.
Step 5: Rule Out TCM Issues
If the sensor and wiring are fine but the code persists, the problem may lie in the Transmission Control Module. You may need:
- Dealer-level diagnostics
- TCM software updates or reprogramming
- In rare cases, complete TCM replacement
This is less common but worth checking—especially if you’re seeing multiple unrelated transmission codes.
DIY or Pro?
Most of the above steps can be performed in your garage with minimal tools. However, if your transmission is stuck in limp mode or you’re unsure about electrical testing, don’t hesitate to consult a pro. A proper diagnosis saves time, parts, and guesswork.
How to Fix the P0720 Nissan Code
Fixing the P0720 Nissan code can range from a simple connector cleaning to more complex transmission repairs. The key is knowing where to start—and how far to go—without wasting money on unnecessary parts. Below are the most common solutions, ranked from simplest to most advanced.
1. Check and Clean the Speed Sensor Connector
Corroded or loose connectors are often the culprit. Remove the output speed sensor (OSS) connector and:
- Inspect for bent pins, dirt, or corrosion
- Spray with electrical contact cleaner
- Reseat it securely and clear the code with a scanner
This alone resolves the issue in a surprising number of cases, especially in high-humidity or older vehicles.
2. Replace the Output Speed Sensor
If the sensor fails resistance testing or shows erratic data in your scan tool:
- Purchase an OEM or high-quality aftermarket OSS (cost: $40–$100)
- Locate the sensor (typically on the transmission housing near the output shaft)
- Remove with a socket wrench and replace
- Refill fluid if any was lost during the process
This is a straightforward job for most DIYers with basic tools. For guidance, review this helpful post on speed sensor location that includes diagrams for several Nissan models.
3. Change or Flush Transmission Fluid
Contaminated or low transmission fluid—especially in CVT systems—can cause erratic speed readings and premature sensor failure. If the fluid is dark, burnt, or hasn’t been changed in over 30,000 miles:
- Drain old fluid (use OEM-spec CVT fluid only)
- Refill and test drive
- Monitor code reappearance
Fluid maintenance is often overlooked but is one of the best long-term fixes for Nissan CVT transmission issues.
4. Reprogram or Replace the TCM
If all hardware checks out and the code remains, a faulty Transmission Control Module (TCM) may be misprocessing signals. Fixes include:
- TCM software updates (dealer or advanced shop required)
- Full TCM replacement (rare but possible, especially in older Altima or Rogue models)
This is usually a last resort and should only be considered after all mechanical causes are ruled out.
Bonus Tip: Always Clear the Code After Repair
Once repairs are complete, don’t forget to:
- Clear the code with your OBD-II scanner
- Drive the vehicle 10–15 miles to confirm it doesn’t return
- Re-scan to verify sensor data is stable
Many DIYers skip this step and worry unnecessarily when the CEL remains temporarily.
Summary of Fix Paths
| Issue | Fix |
|---|---|
| Loose connector | Clean/reseat |
| Bad sensor | Replace |
| Fluid issue | Drain & refill |
| Faulty TCM | Reprogram or replace |
| Wiring damage | Repair or rewire |
By methodically working through each of these, you can resolve the P0720 Nissan code efficiently—often for far less than a full transmission job.
Estimated Repair Cost for the P0720 Nissan Code
When it comes to the P0720 code on Nissan vehicles, the cost to fix it can vary significantly depending on the root cause, the model and year of your vehicle, and whether you choose to fix it yourself or go to a mechanic. Below is a breakdown of what you can expect in 2025, based on current average labor rates and part prices across the U.S.
1. Output Speed Sensor Replacement
- Part cost: $40 – $120 (OEM sensors usually cost more than aftermarket)
- Labor: $80 – $200 (depending on vehicle accessibility and shop rate)
- Total Estimate: $120 – $320
In many cases, this is all that’s needed. It’s one of the most common and cost-effective fixes, and in most Nissan models, the sensor is easily accessible under the hood or near the transmission case.
2. Wiring or Connector Repair
- Parts (wiring harness/connector): $10 – $50
- Labor: $100 – $250 (depending on diagnostic complexity)
- Total Estimate: $110 – $300
If the issue lies in the wiring rather than the sensor, costs can vary based on how easy it is to trace and access the problem area.
3. Transmission Fluid Flush (CVT)
- Fluid cost (genuine Nissan NS-3 or NS-2): $80 – $140
- Labor: $80 – $180
- Total Estimate: $160 – $320
This is often recommended alongside sensor replacement, especially for high-mileage CVT transmissions. A fluid flush won’t fix a bad sensor, but it can eliminate false codes or protect a new sensor from premature failure.
4. TCM Diagnosis, Programming, or Replacement
- Diagnostic scan: $100 – $150
- Reprogramming: $120 – $250 (dealer-only in most cases)
- TCM replacement: $400 – $800+
- Total Estimate: $600 – $1,200+
This is the most expensive scenario and typically occurs only if all other repairs fail. Fortunately, TCM issues related to P0720 are rare and usually diagnosed last.
Pro Tip: Don’t Skip the Diagnosis
Before replacing parts, spend ~$100 for a professional diagnosis—especially if your car is out of warranty. A certified shop can pinpoint the exact failure in less than an hour, which may save you from replacing parts that don’t solve the problem.
DIY vs. Shop: Which is Better?
If you’re comfortable using a multimeter and jack stands, DIY repairs like sensor swaps and fluid changes can save you 40–60% on total cost. But for deeper electrical or TCM-related issues, a reputable transmission specialist is the safer choice.
Conclusion & Call to Action
The P0720 Nissan code might seem like just another line on your OBD-II scanner, but it’s your vehicle’s way of warning you that something isn’t right within the transmission system—particularly in CVT-equipped models, which are known to be sensitive to sensor data and fluid conditions. Ignoring it can lead to reduced performance, safety risks, and costly repairs down the line.
Fortunately, this is one of the more diagnosable and fixable codes, especially when caught early. Whether it’s a faulty output speed sensor, corroded wiring, or just old transmission fluid, resolving the issue often restores normal operation without requiring a full transmission replacement.
We’ve covered everything you need—from what the P0720 code means, to the symptoms and causes, how to diagnose it, what it takes to fix it, and even a realistic cost breakdown for 2025. The most important takeaway? Act early. The sooner you inspect and repair the problem, the less likely you’ll face a major CVT failure.
Your Turn:
Have you dealt with the P0720 code before?
👉 What was the fix that worked for you? Share your experience in the comments—we’d love to hear how other Nissan owners handled it!