P0721 2017 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 2017 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 2017 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 2017 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 2017 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 2017 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 2017 Chevrolet Silverado Code
1. What does the OBDII code P0721 mean on a 2017 Chevrolet Silverado?
P0721 indicates a problem with the Transmission Output Speed Sensor (OSS) performance, which measures the output speed of the transmission to help control shifting and other transmission functions.
2. What are the symptoms of a P0721 code on a 2017 Chevrolet Silverado?
Common symptoms include erratic or delayed shifting, the transmission staying in one gear, reduced fuel efficiency, a lit Check Engine Light, and possible limp mode activation.
3. What causes the P0721 code on a 2017 Chevrolet Silverado?
Causes may include a faulty output speed sensor, damaged wiring or connections, a malfunctioning transmission control module (TCM), or mechanical issues within the transmission.
4. Can I drive my 2017 Chevrolet Silverado with a P0721 code?
Driving with a P0721 code is not recommended, as it can lead to further transmission damage or unsafe driving conditions due to improper gear shifting.
5. How do I diagnose the P0721 code on a 2017 Chevrolet Silverado?
Diagnosis involves scanning for codes, inspecting the output speed sensor and its wiring for damage, testing the sensor with a multimeter, and checking the TCM for faults.
6. How do I fix the P0721 code on a 2017 Chevrolet Silverado?
Repair options include replacing the output speed sensor, repairing damaged wiring or connectors, reprogramming or replacing the TCM, or addressing internal transmission issues if needed.
7. Where is the Transmission Output Speed Sensor located on a 2017 Chevrolet Silverado?
The output speed sensor is typically located on the transmission housing near the output shaft.
8. How much does it cost to fix the P0721 code on a 2017 Chevrolet Silverado?
Repair costs can range from $100 to $400, depending on whether the issue is limited to the sensor and wiring or involves more extensive transmission repairs.
9. Can a faulty output speed sensor cause transmission damage?
Yes, a faulty output speed sensor can lead to improper gear shifting, which may cause excessive wear or damage to the transmission over time.
10. Will clearing the P0721 code fix the problem on my 2017 Chevrolet Silverado?
Clearing the code will temporarily remove the Check Engine Light, but the issue causing the code must be resolved to prevent it from returning.
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