The P071C: Transmission Mode Switch ‘A’ Circuit High refers to a problem where the transmission mode switch A is sending a signal that is too high. This can result from a faulty switch or wiring problems, which may affect the vehicle’s ability to change transmission modes properly.
P071C – Quick Overview
| Code | Information |
|---|---|
| Meaning | P071C: Transmission Mode Switch ‘A’ Circuit High |
| Is it serious? | Yes, as it can cause transmission mode switching problems, leading to drivability issues. |
| Possible causes | – High signal from transmission mode switch A – Faulty switch – Wiring issues |
| How to diagnose? | – Test the switch signal – Inspect wiring and connectors – Replace switch if necessary |
P071C Meaning
The P071C code is triggered when the transmission mode switch A sends a signal that is higher than expected to the transmission control module (TCM). This switch allows the driver to select different transmission modes, such as sport or manual, and a high signal may prevent the system from functioning correctly.
Step-by-step diagnostic guide
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check for other transmission-related codes that may provide additional information about the transmission mode switch issue. | OBD-II Scanner |
| Test the Switch Signal | Use a multimeter or diagnostic tool to test the voltage or signal from transmission mode switch A. Compare the readings with manufacturer specifications to determine if the signal is too high. | Multimeter, Diagnostic Tool |
| Inspect Wiring and Connectors | Visually inspect the wiring and connectors leading to the transmission mode switch A for signs of damage, corrosion, or loose connections that could cause a high signal. | Flashlight, Multimeter |
| Inspect for Electrical Faults | Ensure that no electrical faults, such as blown fuses or damaged relays, are affecting the circuit for the transmission mode switch. | Fuse Tester, Multimeter |
| Replace the Switch if Necessary | If the switch is producing a signal that is too high, replace it with a new transmission mode switch to restore proper function. | Replacement Parts, Standard Tools |
| Clear Code and Retest | After repairs, clear the 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 P071C 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