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P0705 P0xxx · 动力总成（P） 高严重度
Transmission Range Sensor Circuit Malfunction (PRNDL Input)
The ECU cannot determine which gear the selector is in, or sees an implausible combination. The vehicle may refuse to start or start in any position.
严重程度说明： 高——立即停车诊断，继续行驶有扩大损坏的风险
你会注意到的故障现象
- Starts in gear or will not start at all
- Gear display wrong or blank
- Reverse lights incorrect
- Limp mode
常见原因
按可能性从高到低排列——从最上面开始查。
- 1 Misadjusted or failed range/neutral safety switch
- 2 Selector linkage worn or loose
- 3 Corroded connector or wiring
- 4 Water ingress in the switch
如何排查
先做花钱最少、侵入最小的检查——大多数这类码不是零件问题。
- ✓ Compare the displayed gear with the actual lever position in live data across all positions.
- ✓ Check the linkage for wear or maladjustment before replacing the switch.
- ✓ Inspect the connector for water or corrosion.
- ✓ Adjust the switch to the manufacturer's procedure and re-test.
维修方案
- Adjust or replace the range sensor
- Repair or adjust the linkage
- Repair the wiring or connector
P0705 —— 常见问题
Why is it a safety issue? +
A wrong range signal can let the engine crank while in gear, or prevent starting when in park.
Can adjustment fix it? +
Often yes. Always verify adjustment before buying a sensor.