P071A 2018 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 2018 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.
Code P071A 2018 GMC Sierra Description
What are the Possible Causes of the DTC P071A 2018 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 2018 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 2018 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.
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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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