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Engine-Codes – Generic – P071B

P071B Code - Transmission Mode Switch 'A' Circuit Low

Quick Answer

The P071B diagnostic trouble code (DTC) indicates an issue with the Transmission Mode Switch 'A' Circuit being detected as low. Common causes include Faulty transmission mode switch, Damaged wiring or connectors in the circuit, Malfunctioning 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
P071B indicates Transmission Mode Switch 'A' Circuit Low.
Common causes
Common causes include Faulty transmission mode switch, Damaged wiring or connectors in the circuit, Malfunctioning 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 20, 2024
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Code P071B Description

The P071B diagnostic trouble code (DTC) indicates an issue with the Transmission Mode Switch 'A' Circuit being detected as low. This switch is responsible for informing the vehicle's transmission control module (TCM) about the current gear selection or transmission mode. When the circuit is detected as low, it means that the voltage signal from the switch is below the expected range, which can lead to improper transmission operation.

OBDII Code P071B - Transmission Mode Switch 'A' Circuit Low
P071B Code - Transmission Mode Switch 'A' Circuit Low

Common Causes of P071B

  1. Faulty transmission mode switch
  2. Damaged wiring or connectors in the circuit
  3. Malfunctioning TCM
  4. Corrosion in the circuit
  5. Electrical issues

Symptoms of P071B

  1. Erratic shifting patterns
  2. Harsh gear engagements
  3. Transmission fails to shift
  4. Vehicle goes into failsafe mode
  5. Check Engine Light illuminated

How to Fix P071B

  1. Begin by conducting a thorough inspection of the transmission mode switch 'A' circuit, including the switch itself, wiring, and connectors.
  2. Test the voltage signal from the switch to determine if it falls within the expected range.
  3. Replace the transmission mode switch if it is found to be faulty.
  4. Repair or replace any damaged wiring or connectors in the circuit.
  5. Clear the DTC and perform a test drive to ensure the issue has been resolved.

Cost to Fix P071B

The typical repair costs for addressing the Transmission Mode Switch 'A' Circuit Low issue can range from $150 to $400, depending on the extent of the damage and the cost of parts. It's important to note that specific diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check local rates for a more accurate estimate. Additionally, factors such as the vehicle make and model, as well as the location of the repair shop, can influence the overall cost of the repair.

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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.

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