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P071A 2018 Chevrolet Silverado Code - Transmission Tow Mode Switch Circuit

Quick Answer

The P071A diagnostic trouble code (DTC) for a 2018 Chevrolet Silverado relates to the Transmission Tow Mode Switch Circuit. Common causes include Faulty tow mode switch, Wiring or connector issues in the circuit, Faulty transmission control module (TCM). 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 tow mode switch, Wiring or connector issues in the circuit, Faulty transmission control module (TCM).
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 30, 2024
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Code P071A 2018 Chevrolet Silverado Description

The P071A diagnostic trouble code (DTC) for a 2018 Chevrolet Silverado relates to the Transmission Tow Mode Switch Circuit. This code indicates that there is a malfunction in the circuit that controls the transmission tow mode switch. The tow mode switch is a feature in many modern vehicles that allows the driver to adjust the transmission's shift points and behavior when towing heavy loads. When this circuit malfunctions, it can lead to issues with the transmission's performance, potentially affecting the vehicle's towing capabilities and overall drivability.

OBDII Code P071A 2018 Chevrolet Silverado - Transmission Tow Mode Switch Circuit
P071A 2018 Chevrolet Silverado Code - Transmission Tow Mode Switch Circuit

Common Causes of P071A 2018 Chevrolet Silverado

  1. Faulty tow mode switch
  2. Wiring or connector issues in the circuit
  3. Faulty transmission control module (TCM)
  4. Corrosion or damage to circuit components
  5. Electrical issues such as short circuits or open circuits

Symptoms of P071A 2018 Chevrolet Silverado

  1. Harsh or delayed shifting
  2. Inability to engage tow mode
  3. Transmission slipping
  4. Illumination of the check engine light
  5. Decreased fuel efficiency

How to Fix P071A 2018 Chevrolet Silverado

  1. Begin by diagnosing the specific cause of the issue using a scan tool to retrieve the DTC and perform a thorough inspection of the tow mode switch circuit.
  2. Inspect the tow mode switch and its wiring for any visible damage or corrosion. Replace the switch if necessary.
  3. Check the wiring harness and connectors for any signs of damage or poor connections. Repair or replace any damaged components.
  4. Test the transmission control module (TCM) to ensure it is functioning correctly. Replace the TCM if it is found to be faulty.
  5. Clear the DTC and test drive the vehicle to ensure that the issue has been resolved and that the transmission is operating properly in tow mode.

Cost to Fix P071A 2018 Chevrolet Silverado

The cost of repairing a P071A code for a transmission tow mode switch circuit issue can vary depending on the specific cause of the problem and the labor rates in your area. In general, you can expect to pay anywhere from $200 to $500 for parts and labor to address this issue. Keep in mind that diagnostic time and labor rates at auto repair shops can vary, so it's a good idea to get a few quotes from different shops to ensure you're getting a fair price. Additionally, rates may be higher at dealerships or in metropolitan areas, while independent shops may offer more competitive pricing.

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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 vehicle’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 $50–$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 isn’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.

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