AutoCodes – GMC – P0723 2017 GMC Sierra

P0723 2017 GMC Sierra Code - Transmission Output Speed Sensor Circuit Intermittent

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: P0723 2017 GMC Sierra indicates Transmission Output Speed Sensor Circuit Intermittent.
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 267

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
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0723 2017 GMC Sierra 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 the transmission output speed dropped is greater than 650 RPM for 1.5 s.

OBDII Code P0723 2017 GMC Sierra - Transmission Output Speed Sensor Circuit Intermittent - AutoCodes.com — P0723 2017 GMC Sierra Code - Transmission Output Speed Sensor Circuit Intermittent

What does this mean?

What are the Possible Causes of the DTC P0723 2017 GMC Sierra?

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 P0723 2017 GMC Sierra?

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 P0723 2017 GMC Sierra 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.

Need more information about the P0723 2017 GMC Sierra code?

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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 P0723 2017 GMC Sierra Code

What does the OBDII code P0723 mean on a 2017 GMC Sierra?

Code P0723 indicates an intermittent issue with the transmission output speed sensor circuit, which monitors the speed of the transmission output shaft.

What are the common symptoms of P0723 in a 2017 GMC Sierra?

Symptoms may include erratic shifting, reduced fuel efficiency, a lit check engine light, and possibly the transmission entering limp mode.

What causes the P0723 code to appear?

Common causes include a faulty transmission output speed sensor, damaged wiring or connectors, corrosion in the circuit, or issues with the powertrain control module (PCM).

Can a P0723 code affect the drivability of my 2017 GMC Sierra?

Yes, it can cause shifting problems, reduced power, and inconsistent transmission performance, which may impact overall drivability.

How do I diagnose the P0723 code on my GMC Sierra?

Start by inspecting the output speed sensor, wiring, and connectors for damage or corrosion. Use a multimeter to check for proper voltage and continuity.

Do I need to replace the transmission output speed sensor if I have a P0723 code?

Not always. First, inspect the sensor and its wiring for damage or loose connections. Replace the sensor only if it is determined to be faulty.

Can I still drive my 2017 GMC Sierra with a P0723 code?

Driving may be possible, but it is not recommended as the code can cause transmission issues that may worsen over time and lead to further damage.

How much does it cost to fix a P0723 code on a GMC Sierra?

Repair costs vary, but replacing the output speed sensor typically costs $100-$300, while addressing wiring issues may add to the expense.

Can a P0723 code be cleared without fixing the issue?

Clearing the code without addressing the root cause may temporarily turn off the check engine light, but the code will likely return when the issue recurs.

What tools do I need to fix a P0723 code?

You may need an OBDII scanner, multimeter, and basic hand tools for inspecting and replacing the speed sensor and repairing wiring.