AutoCodes – GMC – P071A 2015 GMC Sierra

P071A 2015 GMC Sierra Code - Transmission Tow Mode Switch Circuit

Quick Answer

Tow/haul mode enables the operator to achieve enhanced shift performance when towing or hauling a load. Common causes include Faulty Transmission Tow Mode Switch, Transmission Tow Mode Switch harness is open or shorted, Transmission Tow Mode Switch 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: P071A 2015 GMC Sierra indicates Transmission Tow Mode Switch Circuit.
Common causes: Common causes include Faulty Transmission Tow Mode Switch, Transmission Tow Mode Switch harness is open or shorted, Transmission Tow Mode Switch 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 152

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 P071A 2015 GMC Sierra Description

Tow/haul mode enables the operator to achieve enhanced shift performance when towing or hauling a load. When tow/haul mode is selected, the tow/haul switch input signal to the Body Control Module (BCM) is momentarily toggled from 12 volts to zero volts. The BCM then sends a signal out on the serial data line to the Transmission Control Module (TCM) to increase transmission line pressure and extend the time between upshifts. Selecting the tow/haul switch again disables tow/haul mode and returns the transmission to a normal shift pattern.

OBDII Code P071A 2015 GMC Sierra - Transmission Tow Mode Switch Circuit - AutoCodes.com — P071A 2015 GMC Sierra Code - Transmission Tow Mode Switch Circuit

What does this mean?

What are the Possible Causes of the DTC P071A 2015 GMC Sierra?

Faulty Transmission Tow Mode Switch
Transmission Tow Mode Switch harness is open or shorted
Transmission Tow Mode Switch circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC P071A 2015 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 P071A 2015 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 P071A 2015 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 P071A 2015 GMC Sierra Code

1. What does the OBDII code P071A mean for a 2015 GMC Sierra?

P071A indicates an issue with the Transmission Tow Mode Switch Circuit, which is responsible for enabling or disabling tow mode in the vehicle.

2. What are the common symptoms of code P071A in a 2015 GMC Sierra?

Symptoms may include the tow/haul mode not engaging, an illuminated check engine light, or reduced transmission performance during towing.

3. What causes the P071A code to appear?

Common causes include a faulty tow mode switch, damaged wiring or connectors in the circuit, or an issue with the transmission control module (TCM).

4. Can a damaged tow mode switch cause the P071A code?

Yes, a damaged or malfunctioning tow mode switch is a common cause of this code.

5. How can I diagnose the P071A code in my 2015 GMC Sierra?

You can diagnose the code by inspecting the tow mode switch, checking the wiring and connectors for damage, and using a scan tool to monitor the transmission control module.

6. Is the P071A code serious?

While it may not immediately impact drivability, it can prevent proper towing performance, which could lead to transmission strain if the vehicle is used for towing without tow mode.

7. How do I fix the P071A code on my GMC Sierra?

Repairs typically involve replacing the tow mode switch, repairing damaged wiring or connectors, or reprogramming or replacing the transmission control module.

8. Can I still tow with the P071A code active?

It’s not recommended to tow with this code active, as the transmission may not optimize its performance for towing, potentially causing damage.

9. How much does it cost to repair the P071A code?

Repair costs vary depending on the issue but could range from $50 to $300 for parts and labor, depending on whether the switch, wiring, or TCM needs repair or replacement.

10. Can clearing the P071A code solve the problem?

Clearing the code may temporarily turn off the check engine light, but the underlying issue needs to be resolved to prevent the code from reappearing.