AutoCodes – GMC – P0722 GMC

P0722 GMC Code - Transmission Output Speed Sensor Circuit No Signal

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: P0722 GMC indicates Transmission Output Speed Sensor Circuit No Signal.
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.

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Code Popularity 1,348

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 29, 2022

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0722 GMC Description

The Output Speed Sensor (OSS) is a hall-effect type sensor. The OSS mounts to the automatic transmission case assembly and connects to the control solenoid valve assembly through a 2-wire harness and connector. The sensor faces the park gear teeth. The sensor receives battery voltage on the OSS supply voltage circuit from the Transmission Control Module (TCM). As the output shaft rotates, the sensor produces a signal frequency based on the park gear teeth. This signal is transmitted through the OSS signal circuit to the TCM. The TCM uses the OSS signal to determine line pressure, transmission shift patterns, vehicle speed, and gear ratio.
The Diagnostic Trouble Code (DTC) will be set when the TCM detects a 600 RPM or greater change in output speed.

OBDII Code P0722 GMC - Transmission Output Speed Sensor Circuit No Signal - AutoCodes.com — P0722 GMC Code - Transmission Output Speed Sensor Circuit No Signal

What does this mean?

What are the Possible Causes of the DTC P0722 GMC?

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 P0722 GMC?

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 P0722 GMC 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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Information for Specific GMC Models

P0722 2014 GMC Sierra — Transmission Output Speed Sensor Circuit No Signal
P0722 2015 GMC Sierra — Transmission Output Speed Sensor Circuit No Signal
P0722 2016 GMC Sierra — Transmission Output Speed Sensor Circuit No Signal
P0722 2017 GMC Sierra — Transmission Output Speed Sensor Circuit No Signal
P0722 2018 GMC Sierra — Transmission Output Speed Sensor Circuit No Signal

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0722 GMC Code

1. What does the OBDII code P0722 mean on a GMC vehicle?

P0722 indicates that the transmission output speed sensor is not sending a signal to the vehicleâ€™s powertrain control module (PCM).

2. What are the common symptoms of code P0722 on a GMC?

Symptoms include erratic shifting, the transmission staying in one gear, poor acceleration, and potentially the illumination of the check engine light.

3. What causes the P0722 code in a GMC?

Common causes include a faulty output speed sensor, damaged wiring or connectors, a malfunctioning PCM, or internal transmission issues.

4. Can I drive my GMC with a P0722 code?

Driving with a P0722 code is not recommended, as it may cause further transmission damage or unsafe driving conditions due to erratic shifting.

5. How do I diagnose the P0722 code on a GMC vehicle?

Diagnosis involves inspecting the output speed sensor, checking the wiring and connectors for damage, and using a scan tool to monitor sensor data for irregularities.

6. How do I fix the P0722 code on my GMC?

Repairs may include replacing the output speed sensor, repairing or replacing damaged wiring, or reprogramming or replacing the PCM if necessary.

7. How much does it cost to repair a P0722 code on a GMC?

The cost varies but typically ranges from $150 to $400, depending on whether the issue is with the sensor, wiring, or PCM.

8. Can a bad battery cause the P0722 code on a GMC?

A weak or failing battery can cause electrical issues, but itâ€™s less likely to directly cause a P0722 code. Itâ€™s best to inspect the speed sensor and wiring first.

9. How do I reset the P0722 code on my GMC?

After repairs, the code can be cleared using an OBDII scanner. However, ensure the issue is resolved to prevent the code from returning.

10. Is the transmission output speed sensor difficult to replace on a GMC?

Replacing the sensor is generally straightforward and may be a DIY job for those with basic mechanical skills, though its location depends on the specific GMC model.