The P071E: Transmission Mode Switch ‘B’ Circuit Low refers to a problem where the signal from the transmission mode switch B circuit is too low. This may be caused by a faulty switch, wiring issues, or poor electrical connections, leading to improper transmission mode selection or operation.
P071E – Quick Overview
| Code | Information |
|---|---|
| Meaning | P071E: Transmission Mode Switch ‘B’ Circuit Low |
| Is it serious? | Yes, as it can cause the transmission to function incorrectly or prevent mode switching, affecting drivability. |
| Possible causes | – Low 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 |
P071E Meaning
The P071E code is triggered when the transmission mode switch B circuit is sending a signal that is too low. This switch allows the driver to select specific transmission modes, and a low signal can prevent the transmission control module (TCM) from recognizing or activating the desired mode.
Step-by-step diagnostic guide
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check for additional codes related to the transmission or mode switch that may offer further insight. | 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 to manufacturer specifications to ensure they are not too low. | Multimeter, Diagnostic Tool |
| Inspect Wiring and Connectors | Visually inspect the wiring and connectors leading to the transmission mode switch B for signs of damage, corrosion, or loose connections that could cause a low signal. | Flashlight, Multimeter |
| Inspect for Electrical Faults | Check for any blown fuses or electrical faults affecting the transmission mode switch B circuit. | Fuse Tester, Multimeter |
| Replace the Switch if Necessary | If the transmission mode switch B is found to be faulty or producing a low signal, replace it with a new switch to restore proper functionality. | Replacement Parts, Standard Tools |
| Clear Code and Retest | After repairs, clear the P071E code using an OBD-II scanner and take the vehicle for a test drive to ensure the issue is resolved. | OBD-II Scanner |
| Recheck for Codes | After the test drive, re-scan the vehicle to ensure the P071E code has not returned. | OBD-II Scanner |
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