AutoCodes – GMC – P176D 2018 GMC Sierra

P176D 2018 GMC Sierra Code - Intermediate Speed Sensor Circuit High Voltage

Quick Answer

The sensor contains a hall-effect sensor and additional electronics that process the signal. Common causes include Faulty Transmission Intermediate Shaft Speed Sensor, Transmission Intermediate Shaft Speed Sensor harness is open or shorted, Transmission Intermediate Shaft 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: P176D 2018 GMC Sierra indicates Intermediate Speed Sensor Circuit High Voltage.
Common causes: Common causes include Faulty Transmission Intermediate Shaft Speed Sensor, Transmission Intermediate Shaft Speed Sensor harness is open or shorted, Transmission Intermediate Shaft 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 254

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 Aug 29, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P176D 2018 GMC Sierra Description

The sensor contains a hall-effect sensor and additional electronics that process the signal. It detects the change of the strength of the magnetic field caused by the reluctor ring. When the strength changes, the sensor changes the amount of current it consumes. This results in a square wave signal of the current, while the voltage stays constant. The control module detects the frequency in which the current changes, which is proportional to the rotational speed.
The sensor is an input to the control module. The input signal is used to determine the rotational speed of the component, the Diagnostic Trouble Code (DTC) will be set when the reaction Carrier Assembly Transmission Intermediate Speed Sensor is less than 4.75 V for greater than 1 s.

OBDII Code P176D 2018 GMC Sierra - Intermediate Speed Sensor Circuit High Voltage - AutoCodes.com — P176D 2018 GMC Sierra Code - Intermediate Speed Sensor Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P176D 2018 GMC Sierra?

Faulty Transmission Intermediate Shaft Speed Sensor
Transmission Intermediate Shaft Speed Sensor harness is open or shorted
Transmission Intermediate Shaft Speed Sensor circuit poor electrical connection
Faulty Transmission Control Module

How to Fix the DTC P176D 2018 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 P176D 2018 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 P176D 2018 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 P176D 2018 GMC Sierra Code

1. What does the OBDII code P176D mean on a 2018 GMC Sierra?

The P176D code refers to "Intermediate Speed Sensor Circuit High Voltage," indicating an issue with the transmission speed sensor circuit reporting excessively high voltage.

2. What are the common symptoms of the P176D code in a 2018 GMC Sierra?

Symptoms may include erratic shifting, transmission slipping, reduced fuel efficiency, check engine light illumination, and potentially entering limp mode.

3. What causes the P176D code to appear on a GMC Sierra?

Common causes include a faulty intermediate speed sensor, damaged wiring or connectors, corrosion in the circuit, or an issue with the transmission control module (TCM).

4. Can I continue driving my 2018 GMC Sierra with the P176D code?

While it may be possible to drive short distances, continued driving can lead to further damage to the transmission. Itâ€™s best to address the issue promptly.

5. How do you diagnose the P176D code on a GMC Sierra?

Diagnosis involves scanning the vehicle's ECU, inspecting the intermediate speed sensor, checking wiring and connectors for damage or corrosion, and testing the voltage at the sensor.

6. How do you fix the P176D code on a 2018 GMC Sierra?

Repairs may include replacing the intermediate speed sensor, repairing or replacing damaged wiring, cleaning corroded connectors, or reprogramming/updating the TCM.

7. How much does it cost to repair the P176D code on a GMC Sierra?

Repair costs vary depending on the issue but can range from $150-$400 for sensor replacement and wiring repairs. TCM replacement or reprogramming may cost more.

8. Can a faulty speed sensor lead to transmission damage in a GMC Sierra?

Yes, a faulty speed sensor can cause improper shifting, leading to potential wear and damage to the transmission over time if left unresolved.

9. Will clearing the P176D code fix the problem on a GMC Sierra?

Clearing the code may temporarily remove it, but if the underlying issue isnâ€™t resolved, the code will return.

10. How can I prevent the P176D code from occurring on my GMC Sierra?

Regular maintenance, including periodic inspections of the transmission system, wiring, and connectors, can help prevent issues that trigger the P176D code.