The P071B code is an OBD-II trouble code that indicates an issue with the Transmission Mode Switch “A” circuit, which is functioning at a low voltage level. This code is related to the vehicle’s ability to operate in towing mode, a feature that enhances the transmission’s shifting capabilities when towing heavy loads.
What Does the P071B Code Mean?
The P071B code specifically refers to a problem with the Transmission Mode Switch “A” circuit, which is integral for enabling the towing mode in an automatic transmission. When this code is triggered, it indicates that the circuit is reporting a low voltage, suggesting a malfunction in the switch or its wiring.
What Causes the P071B Code?
Several factors can contribute to the P071B code being triggered:
- Failure of the shift lever assembly.
- Malfunction of the Transmission Control Module (TCM).
- Wiring issues such as shorts or open circuits in the transmission mode switch circuit.
What Are the Symptoms of the P071B Code?
When the P071B code is present, you may experience the following symptoms:
- Towing mode will be disabled.
- Possible transmission shifting problems.
- Check Engine Light illuminated on the dashboard.
How Serious Is the P071B Code?
The P071B code is considered urgent and significant. If not addressed promptly, it can lead to more severe damage to the vehicle’s transmission system. Immediate action is recommended to prevent long-term consequences and to ensure safe vehicle operation.
How to Diagnose the P071B Code
To diagnose the P071B code, a mechanic will typically follow these steps:
- Use an OBD-II scanner to confirm the P071B code and check for any additional trouble codes.
- Inspect the transmission mode switch and its wiring for visible damage or disconnections.
- Test the continuity and voltage of the switch using a multimeter.
- Check the function of the Transmission Control Module.
Common Repairs for the P071B Code
Possible repairs for the P071B code include:
- Replacing the faulty shift lever assembly.
- Repairing or replacing damaged wiring or connectors.
- Replacing the Transmission Control Module if it is found to be defective.
How Much Does It Cost to Fix the P071B Code?
The cost to fix the P071B code can vary widely depending on the specific issue and the labor rates in your area. Repair costs may range from $100 to $1,000, depending on whether it requires a simple wiring repair or a more complex component replacement.
Can I Fix the P071B Code Myself?
While some DIY enthusiasts may be able to address minor wiring issues or replace a switch, the diagnosis of transmission-related problems can be complex and requires specific tools and expertise. If you are not experienced with automotive repairs, it is advisable to seek professional assistance to ensure that the problem is resolved effectively.
