Engine-Codes.com
Engine-Codes – GMC – P071A GMC

P071A GMC Code - Transmission Tow Mode Switch Circuit

Quick Answer

The P071A code for GMC vehicles indicates an issue with the Transmission Tow Mode Switch Circuit. Common causes include Faulty tow/haul mode switch, Wiring or electrical connection issues in the circuit, Malfunctioning PCM. 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 GMC indicates Transmission Tow Mode Switch Circuit.
Common causes
Common causes include Faulty tow/haul mode switch, Wiring or electrical connection issues in the circuit, Malfunctioning PCM.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 12, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P071A GMC Description

The P071A code for GMC vehicles indicates an issue with the Transmission Tow Mode Switch Circuit. This code is specifically related to the circuit that controls the transmission's tow/haul mode. Tow/haul mode is a feature in many modern vehicles that adjusts the transmission's shift points and torque converter lockup to optimize performance when towing heavy loads or driving in hilly terrain.

OBDII Code P071A GMC - Transmission Tow Mode Switch Circuit
P071A GMC Code - Transmission Tow Mode Switch Circuit

Common Causes of P071A GMC

  1. Faulty tow/haul mode switch
  2. Wiring or electrical connection issues in the circuit
  3. Malfunctioning PCM
  4. Corrosion or damage to the circuit components
  5. Issues with the transmission control module

Symptoms of P071A GMC

  1. Check engine light illuminated on the dashboard
  2. Difficulty engaging or disengaging tow/haul mode
  3. Transmission shifting erratically
  4. Reduced fuel efficiency
  5. Harsh or delayed shifting

How to Fix P071A GMC

  1. Begin by diagnosing the issue using a professional diagnostic scanner to confirm the P071A code and pinpoint the exact cause of the problem.
  2. Inspect the tow/haul mode switch and its wiring for any visible damage or corrosion. Replace the switch if necessary.
  3. Check the circuit connections for any loose or damaged wires. Repair or replace as needed.
  4. Test the PCM and transmission control module for proper functioning. Replace if found to be faulty.
  5. Clear the code from the PCM memory and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P071A GMC

The cost of repairing a P071A code for a GMC vehicle can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. On average, the parts needed for this repair, such as a new tow/haul mode switch or wiring components, could range from $50 to $200. Labor costs can fluctuate between $100 to $300, depending on the shop's hourly rates and the complexity of the repair. Overall, the total cost for addressing this issue could be in the range of $150 to $500. However, it's important to note that prices can differ based on location and the vehicle's make and model.

Need more information about the P071A GMC code?

Need more information on how to fix the P071A GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P071A GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

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 GMC Code

1. What does the OBDII code P071A on a GMC vehicle mean?

P071A indicates a problem in the Transmission Tow Mode Switch Circuit, which controls the tow/haul mode for improved transmission performance during towing or heavy loads.

2. What are the common symptoms of the P071A code?

Symptoms may include the tow/haul mode not engaging, the tow mode indicator light not functioning, decreased towing performance, or the check engine light turning on.

3. What causes the P071A code to appear?

Common causes include a faulty tow/haul mode switch, damaged wiring or connectors in the tow mode circuit, or a malfunction in the transmission control module (TCM).

4. Can I still drive my GMC with the P071A code active?

Yes, you can drive the vehicle, but the tow/haul mode may not function, which can affect towing performance and place extra strain on the transmission.

5. How is the P071A code diagnosed?

A technician will use a scan tool to confirm the code, inspect the tow/haul mode switch, check the wiring and connectors for damage, and test the circuit for proper voltage and continuity.

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

Repairs may include replacing the tow/haul mode switch, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the transmission control module if necessary.

7. What tools are needed to fix the P071A code?

Tools typically include a diagnostic scan tool, a multimeter for testing the circuit, and basic tools for accessing and replacing the tow/haul mode switch or wiring.

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

Repair costs vary depending on the cause but can range from $100 to $300 for switch or wiring repairs, while TCM replacement can cost $500 or more.

9. Can the P071A code be prevented?

Regular maintenance, inspecting the tow/haul mode switch and wiring for wear, and avoiding excessive strain on the transmission can help prevent the code from appearing.

10. Does a faulty tow/haul mode switch always trigger the P071A code?

Not always. While a faulty switch is a common cause, issues with wiring, connectors, or the TCM can also trigger the code, requiring thorough diagnosis.

Discuss the causes and fixes for P071A GMC OBDII Code

Submit a New Comment

Code P071A GMC comments

No comments found for this page.