P0721 2016 Chevrolet Silverado Code - Transmission Output Speed Sensor Performance
Quick Answer
The Output Speed Sensor (OSS) is a hall-effect type sensor. Common causes include Faulty Transmission Output Speed Sensor (OSS), Transmission Output Speed Sensor harness is open or shorted, Transmission Output Speed Sensor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0721 2016 Chevrolet Silverado indicates Transmission Output Speed Sensor Performance.
- Common causes
- Common causes include Faulty Transmission Output Speed Sensor (OSS), Transmission Output Speed Sensor harness is open or shorted, Transmission Output Speed Sensor circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P0721 2016 Chevrolet Silverado Description
The Diagnostic Trouble Code (DTC) will be set when the TCM detects a noisy output speed signal.
What are the Possible Causes of the DTC P0721 2016 Chevrolet Silverado?
- Faulty Transmission Output Speed Sensor (OSS)
- Transmission Output Speed Sensor harness is open or shorted
- Transmission Output Speed Sensor circuit poor electrical connection
- Faulty Transmission Control Module (TCM)
How to Fix the DTC P0721 2016 Chevrolet Silverado?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0721 2016 Chevrolet Silverado code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P0721 2016 Chevrolet Silverado Code
1. What does the OBDII code P0721 mean for a 2016 Chevrolet Silverado?
The P0721 code indicates a problem with the transmission output speed sensor's performance, which monitors the rotational speed of the transmission's output shaft.
2. What are the common symptoms of P0721 in a 2016 Chevrolet Silverado?
Symptoms may include erratic shifting, delayed gear engagement, reduced fuel efficiency, or the transmission staying in one gear.
3. What causes the P0721 code on a 2016 Chevrolet Silverado?
Common causes include a faulty transmission output speed sensor, damaged wiring or connectors, or issues with the transmission control module (TCM).
4. Can driving with the P0721 code damage my 2016 Chevrolet Silverado?
Yes, prolonged driving with this issue can lead to further transmission damage and unsafe driving conditions due to erratic shifting.
5. How do I diagnose the P0721 code on a 2016 Chevrolet Silverado?
Check the output speed sensor for damage, inspect wiring and connectors for corrosion or disconnection, and use a scan tool to monitor sensor data.
6. How do I fix the P0721 code on a 2016 Chevrolet Silverado?
Repairs typically involve replacing the transmission output speed sensor, repairing damaged wiring, or addressing issues with the TCM if necessary.
7. How much does it cost to fix the P0721 code on a 2016 Chevrolet Silverado?
Depending on the repair, costs can range from $150 to $400, with sensor replacement being the most common fix.
8. Can a dirty transmission fluid cause the P0721 code on a 2016 Chevrolet Silverado?
While uncommon, dirty or low transmission fluid can affect sensor readings and overall transmission performance, potentially triggering the code.
9. Where is the transmission output speed sensor located on a 2016 Chevrolet Silverado?
The sensor is typically located on the transmission housing, near the output shaft.
10. Do I need to reset the ECM after fixing the P0721 code on a 2016 Chevrolet Silverado?
Yes, clearing the code with a scan tool after repairs ensures the ECM recognizes the fix and monitors future performance accurately.
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