Dodge OBD2 Code P0720: Output Speed Sensor Circuit Malfunction

The dreaded P0720 code. If your Dodge is displaying this, it means trouble with the Output Speed Sensor (OSS) circuit. This article will delve deep into the P0720 code, explaining its causes, symptoms, diagnostic procedures, and solutions. We’ll equip you with the knowledge to understand this issue and get your Dodge back on the road.

Understanding the P0720 Code

The P0720 code, specifically “Output Speed Sensor Circuit Malfunction,” indicates a problem with the transmission output speed sensor circuit. This sensor, located on the output shaft of the transmission, monitors the rotational speed of the output shaft and sends this data to the Powertrain Control Module (PCM) or Transmission Control Module (TCM). This information is crucial for proper shifting, torque converter clutch operation, and speedometer readings. A malfunctioning OSS circuit can lead to a variety of driving issues and reduced fuel economy.

Dodge P0720 Output Speed Sensor Location

Symptoms of a P0720 Code in a Dodge

The symptoms of a P0720 code can vary depending on the severity of the issue and the specific Dodge model. Some common symptoms include:

Check Engine Light illumination: This is the most obvious sign.
Erratic shifting: The transmission may shift harshly, slip, or delay shifts.
Incorrect speedometer readings: The speedometer may fluctuate, display inaccurate speeds, or stop working altogether.
Reduced fuel economy: The engine may be working harder due to incorrect shift points, resulting in lower fuel mileage.
Limp mode: In some cases, the vehicle may enter a “limp mode” to prevent further damage, limiting speed and acceleration.
Torque converter clutch issues: The torque converter may not lock up properly, affecting fuel efficiency and performance.

What Causes a P0720 Code in a Dodge?

Several factors can contribute to a P0720 code:

Faulty Output Speed Sensor: The sensor itself may be damaged or worn out due to age, heat, or vibration.
Wiring problems: Damaged, corroded, or loose wiring in the sensor circuit can disrupt the signal.
Damaged connector: The connector for the OSS may be corroded, loose, or broken.
Transmission fluid issues: Low transmission fluid levels or contaminated fluid can affect the sensor’s operation.
PCM/TCM problems: Although less common, a faulty PCM or TCM can also cause this code.

Dodge P0720 Wiring Diagram

Diagnosing the P0720 Code

Diagnosing the P0720 code involves a systematic approach:

Retrieve the code: Use an OBD2 scanner to confirm the P0720 code.
Visually inspect the wiring and connector: Check for any obvious damage, corrosion, or loose connections.
Check the transmission fluid: Verify the fluid level and condition.
Test the Output Speed Sensor: Use a multimeter to test the sensor’s resistance and voltage.
Check the sensor circuit continuity: Ensure there are no breaks or shorts in the wiring.

How to Fix a P0720 Code in a Dodge

The solution to a P0720 code depends on the root cause:

Replace the Output Speed Sensor: If the sensor is faulty, replacement is typically the most straightforward fix.
Repair or replace the wiring: Damaged or corroded wiring should be repaired or replaced as needed.
Replace the connector: A damaged connector needs to be replaced.
Change the transmission fluid: Address any issues with the transmission fluid level or condition.
Address PCM/TCM problems: If the PCM or TCM is faulty, it may require reprogramming or replacement.

Dodge P0720 Output Speed Sensor Replacement

Conclusion

The P0720 code in your Dodge can be a frustrating issue, but understanding its causes and symptoms can help you diagnose and resolve the problem effectively. By following the steps outlined in this article, you can get your Dodge back on the road and running smoothly. Remember to address this issue promptly to avoid further damage and costly repairs.

FAQ

Can I drive my Dodge with a P0720 code? While you might be able to drive, it’s not recommended. Continuing to drive could worsen the problem.
How much does it cost to fix a P0720 code? The cost varies depending on the cause and repair.
Is the P0720 code the same for all Dodge models? Yes, the code definition is the same, but the specific location and diagnostic procedures may vary slightly.
What tools do I need to diagnose a P0720 code? An OBD2 scanner and a multimeter are essential tools.
Can I fix a P0720 code myself? With some mechanical skills, it’s possible to fix the issue yourself, especially if it’s a simple sensor or wiring problem.
How can I prevent a P0720 code in the future? Regular transmission maintenance, including fluid changes, can help prevent this and other transmission issues.
What other codes are commonly associated with the P0720 code? Related codes may include P0721 (Output Speed Sensor Range/Performance) and P0722 (Output Speed Sensor No Signal).

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