AutoCodes – GMC – P0881 2018 GMC Sierra

P0881 2018 GMC Sierra Code - Transmission Control Module Supply Voltage Performance

Quick Answer

The Transmission Control Module (TCM) requires continuous battery voltage to operate. Common causes include Transmission Control Module (TCM) Power and/or Ground connection, Faulty Transmission Control Module, Transmission Control Module harness is open or shorted. 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: P0881 2018 GMC Sierra indicates Transmission Control Module Supply Voltage Performance.
Common causes: Common causes include Transmission Control Module (TCM) Power and/or Ground connection, Faulty Transmission Control Module, Transmission Control Module harness is open or shorted.
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 203

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 03, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0881 2018 GMC Sierra Description

The Transmission Control Module (TCM) requires continuous battery voltage to operate. The Transmission Control Module monitors the battery voltage. The Diagnostic Trouble Code (DTC) will be set when the Transmission Control Module detects a variation in battery B+ voltage greater than 4 V for 0.5 s within a 1.5 s period.

OBDII Code P0881 2018 GMC Sierra - Transmission Control Module Supply Voltage Performance - AutoCodes.com — P0881 2018 GMC Sierra Code - Transmission Control Module Supply Voltage Performance

What does this mean?

What are the Possible Causes of the DTC P0881 2018 GMC Sierra?

Transmission Control Module (TCM) Power and/or Ground connection
Faulty Transmission Control Module
Transmission Control Module harness is open or shorted
Transmission Control Module circuit poor electrical connection

How to Fix the DTC P0881 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 P0881 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 P0881 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 P0881 2018 GMC Sierra Code

1. What does the OBDII code P0881 mean on a 2018 GMC Sierra?

P0881 indicates an issue with the Transmission Control Module (TCM) supply voltage, meaning the TCM is not receiving the correct voltage for proper operation.

2. What are the common symptoms of code P0881 in a 2018 GMC Sierra?

Common symptoms include transmission slipping, harsh shifting, failure to shift, the vehicle going into limp mode, and the illumination of the check engine light.

3. What causes the P0881 code to appear on a 2018 GMC Sierra?

The code can be caused by a faulty TCM, damaged wiring or connectors in the TCM circuit, a failing transmission relay, a weak or failing battery, or issues with the alternator.

4. Can I still drive my 2018 GMC Sierra with a P0881 code?

Driving with a P0881 code is not recommended, as it may cause transmission damage or leave the vehicle stuck in limp mode, limiting performance.

5. How do I diagnose the P0881 code on a 2018 GMC Sierra?

Diagnose by checking for damaged or loose wiring and connectors in the TCM circuit, testing the transmission relay, verifying the battery and alternator voltage, and using a scan tool to monitor TCM voltage readings.

6. How do I fix the P0881 code on a 2018 GMC Sierra?

Repairs may include replacing damaged wiring or connectors, replacing a faulty TCM or transmission relay, or addressing battery or alternator issues to restore proper voltage.

7. How much does it cost to repair code P0881 on a 2018 GMC Sierra?

Repair costs vary, but replacing a transmission relay typically costs $20â€“$50, while a TCM replacement can range from $300â€“$1,000, depending on parts and labor.

8. Can a weak battery cause the P0881 code on a 2018 GMC Sierra?

Yes, a weak or failing battery can cause insufficient voltage to the TCM, triggering the P0881 code.

9. How can I prevent the P0881 code from occurring on my 2018 GMC Sierra?

Prevent the code by maintaining the battery and alternator, inspecting wiring and connectors regularly, and ensuring the transmission relay functions properly.

10. Does the P0881 code always mean the TCM is bad on a 2018 GMC Sierra?

No, the TCM may not necessarily be faulty; the issue could lie with wiring, the transmission relay, or the vehicleâ€™s electrical system. Proper diagnosis is essential.