Transmission Range Sensor Circuit Malfunction (P0705)
The P0705 code indicates a problem with the transmission range sensor (also known as the neutral safety switch or PRNDL input). This sensor tells the powertrain control module (PCM) which gear the driver has selected. A malfunction can cause incorrect gear position signals, leading to starting issues, erratic shifting, or no start conditions. Common causes include a faulty sensor, wiring issues, or a misadjusted shift linkage.
1. Symptoms You Will Notice
- Engine starts only in Park or Neutral (or not at all)
- Reverse lights not working
- Erratic or harsh shifting
- Check Engine Light illuminated
2. Most Common Causes
- Faulty transmission range sensor
- Damaged or corroded wiring/connectors
- Misadjusted shift linkage
- Failed PCM (rare)
3. Step-by-Step Diagnosis
Step 1: Scan for codes and verify P0705 is present.
Step 2: Inspect the transmission range sensor connector for corrosion or damage.
Step 3: Test the sensor's resistance and voltage according to manufacturer specs.
Step 4: Check shift linkage adjustment and ensure proper cable operation.
Step 5: If all else fails, replace the transmission range sensor.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. The vehicle may start in gear or fail to start, and shifting can be unpredictable, posing a safety risk.
How much does it cost to fix?▼
Typically $50-$150 for parts and labor, depending on vehicle make and model.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.