P071A 2018 GMC Sierra Code - Transmission Tow Mode Switch Circuit
Quick Answer
The P071A diagnostic trouble code (DTC) for a 2018 GMC Sierra refers to an issue with the Transmission Tow Mode Switch Circuit. Common causes include Faulty tow mode switch, Damaged wiring or connectors in the tow mode switch circuit, Corrosion or poor connections in the circuit. 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 GMC Sierra indicates Transmission Tow Mode Switch Circuit.
- Common causes
- Common causes include Faulty tow mode switch, Damaged wiring or connectors in the tow mode switch circuit, Corrosion or poor connections in the circuit.
- 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 P071A 2018 GMC Sierra Description
The P071A diagnostic trouble code (DTC) for a 2018 GMC Sierra refers to an issue with the Transmission Tow Mode Switch Circuit. This code indicates that there is a malfunction in the circuit responsible for controlling the transmission tow mode switch. The tow mode switch is a feature that allows the driver to adjust the transmission settings for towing heavy loads, optimizing performance and fuel efficiency.
Common Causes of P071A 2018 GMC Sierra
- Faulty tow mode switch
- Damaged wiring or connectors in the tow mode switch circuit
- Corrosion or poor connections in the circuit
- Issues with the transmission control module (TCM)
- Electrical issues within the transmission system
Symptoms of P071A 2018 GMC Sierra
- Erratic shifting behavior
- Reduced towing capability
- Decreased fuel efficiency
- Illuminated check engine light
- Transmission slipping or hesitation
How to Fix P071A 2018 GMC Sierra
- Begin by conducting a thorough inspection of the tow mode switch and its circuitry to identify any visible damage or issues.
- Test the tow mode switch using a multimeter to check for proper functionality.
- Inspect the wiring and connectors in the circuit for any signs of damage, corrosion, or poor connections.
- If necessary, replace the tow mode switch or repair any damaged wiring or connectors.
- Clear the DTC with a diagnostic scanner and test drive the vehicle to ensure the issue has been resolved.
Cost to Fix P071A 2018 GMC Sierra
The typical repair costs for addressing the P071A code can vary depending on the specific cause of the issue. In general, replacing a faulty tow mode switch or repairing damaged wiring may cost between $100 to $300, including parts and labor. However, additional diagnostic time and labor rates at auto repair shops can influence the overall cost. It is advisable to consult with a professional mechanic to obtain an accurate estimate based on the vehicle's make and model, as well as the extent of the repair needed.
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Frequently Asked Questions about P071A 2018 GMC Sierra Code
1. What does the OBDII code P071A mean for a 2018 GMC Sierra?
The code P071A indicates an issue with the Transmission Tow Mode Switch Circuit, which monitors the functionality of the tow/haul mode switch.
2. What are the common symptoms of code P071A in a 2018 GMC Sierra?
Symptoms may include the tow/haul mode not engaging, reduced towing performance, or the tow/haul indicator light not functioning properly.
3. What causes the P071A code in a 2018 GMC Sierra?
Common causes include a faulty tow/haul mode switch, damaged wiring or connectors in the switch circuit, or issues with the transmission control module (TCM).
4. Can I drive my 2018 GMC Sierra with code P071A?
Yes, you can drive the vehicle, but towing performance may be compromised, and the tow/haul mode may not function properly.
5. How do you diagnose code P071A on a 2018 GMC Sierra?
Diagnosis involves using a scan tool to verify the code, visually inspecting the tow/haul mode switch and wiring, and testing the circuit for proper voltage and continuity.
6. How can I fix the P071A code on my 2018 GMC Sierra?
Repairs may include replacing the tow/haul mode switch, repairing damaged wiring or connectors, or reprogramming or replacing the transmission control module.
7. What tools are needed to diagnose and repair code P071A?
You’ll need an OBDII scan tool, a multimeter for testing electrical circuits, and basic hand tools for switch or wiring replacement.
8. How much does it cost to fix code P071A on a 2018 GMC Sierra?
Repair costs vary but generally range from $100 to $300, depending on whether the issue is a faulty switch, wiring repair, or TCM replacement.
9. Can a faulty tow/haul mode switch cause other transmission problems?
A faulty switch typically only impacts the tow/haul mode operation and does not directly cause other transmission issues.
10. Should the transmission control module be replaced for code P071A?
Replacing the TCM is only necessary if it’s confirmed to be the root cause after testing the switch and circuit.
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