The P071F: Transmission Mode Switch ‘B’ Circuit High refers to an issue where the transmission mode switch B circuit is sending a high signal. This could result from a faulty switch or wiring problems, preventing the transmission from operating in the correct mode.
P071F – Quick Overview
| Code | Information |
|---|---|
| Meaning | P071F: Transmission Mode Switch ‘B’ Circuit High |
| Is it serious? | Yes, as a high signal can prevent the transmission from switching modes correctly, affecting drivability. |
| Possible causes | – High signal from transmission mode switch B – Faulty switch – Wiring issues |
| How to diagnose? | – Test the switch signal – Inspect wiring and connectors – Replace switch if necessary |
P071F Meaning
The P071F code is triggered when the signal from transmission mode switch B is higher than expected. This switch allows the driver to choose different driving modes, and a high signal could prevent the transmission control module (TCM) from recognizing or activating the correct mode.
Step-by-step diagnostic guide
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check for additional transmission-related codes that may provide further insight into the transmission mode switch issue. | OBD-II Scanner |
| Test the Switch Signal | Use a multimeter or diagnostic tool to measure the signal voltage from transmission mode switch B. Compare the readings with manufacturer specifications to confirm if the signal is too high. | Multimeter, Diagnostic Tool |
| Inspect Wiring and Connectors | Visually inspect the wiring and connectors for damage, corrosion, or loose connections that may cause a high signal from the transmission mode switch. | Flashlight, Multimeter |
| Inspect for Electrical Faults | Check for blown fuses or other electrical issues that may affect the transmission mode switch B circuit. | Fuse Tester, Multimeter |
| Replace the Switch if Necessary | If the transmission mode switch B is faulty or sending a high signal, replace the switch to restore proper mode selection functionality. | Replacement Parts, Standard Tools |
| Clear Code and Retest | After repairs, clear the P071F code using an OBD-II scanner and test the vehicle to confirm that the issue is resolved. | OBD-II Scanner |
| Recheck for Codes | After the test drive, re-scan the vehicle to ensure the P071F code has not returned. | OBD-II Scanner |
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I test OBD-II scanners and make DIY Engine diagnostics guides to help you solve your car problems without having to depend on the mechanic. A lot of them will try to scam you or are just no help at all. About Juraj Lukacko