AutoCodes – Chevrolet – P071A 2018 Chevrolet Silverado

P071A 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado 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 250

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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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 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado - Transmission Tow Mode Switch Circuit - AutoCodes.com — P071A 2018 Chevrolet Silverado Code - Transmission Tow Mode Switch Circuit

What does this mean?

What are the Possible Causes of the DTC P071A 2018 Chevrolet Silverado?

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 2018 Chevrolet Silverado?

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 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado Code

1. What does OBDII code P071A mean on a 2018 Chevrolet Silverado?

P071A indicates an issue with the Transmission Tow Mode Switch Circuit, meaning the vehicleâ€™s computer has detected a malfunction in the tow/haul mode switch or its wiring.

2. What are the common symptoms of code P071A?

Symptoms may include the tow/haul mode not engaging, a check engine light, reduced towing performance, or irregular shifting behavior.

3. What causes code P071A on a 2018 Chevrolet Silverado?

Common causes include a faulty tow/haul mode switch, damaged wiring or connectors, a malfunctioning transmission control module (TCM), or a blown fuse.

4. Is it safe to drive with code P071A?

While the truck may still be drivable, towing performance and transmission behavior could be compromised, which may lead to additional strain on the transmission.

5. How do I troubleshoot code P071A?

Inspect the tow/haul mode switch, wiring, and connectors for damage or corrosion. Use a multimeter to test for continuity and ensure proper voltage is reaching the switch.

6. How is code P071A typically repaired?

Repairs may involve replacing the tow/haul mode switch, repairing damaged wiring or connectors, or reprogramming or replacing the TCM if necessary.

7. Can a blown fuse cause code P071A?

Yes, a blown fuse in the circuit supplying power to the tow/haul mode switch can cause this code to appear.

8. How much does it cost to fix code P071A on a Silverado?

Repair costs can vary, but replacing the tow/haul mode switch typically costs $50â€“$150 for parts and labor, while extensive wiring repairs or TCM replacement could cost more.

9. Can I clear code P071A without fixing the issue?

You can clear the code with an OBDII scanner, but if the underlying issue isnâ€™t resolved, the code and symptoms will likely return.

10. Does code P071A affect towing capacity?

Yes, if the tow/haul mode cannot engage, the transmission may not optimize for towing, potentially reducing performance and placing extra stress on the drivetrain.