Transmission Range Sensor Out of Self-Test Range
The P1705 code indicates that the Transmission Range (TR) sensor, also known as the neutral safety switch or manual lever position sensor, has failed its self-test. This sensor tells the PCM the gear selector position (Park, Reverse, Neutral, Drive). When the sensor output voltage is outside the expected range during the self-test, the PCM sets this code. Common causes include a faulty sensor, misadjusted linkage, wiring issues, or a bad PCM. Symptoms may include no start in Park or Neutral, incorrect gear display, or transmission shifting problems.
1. Symptoms You Will Notice
- Engine cranks but won't start in Park or Neutral
- Transmission shifts erratically or stuck in limp mode
- Incorrect gear position displayed on dash
- Reverse lights not working
- Check Engine Light illuminated
2. Most Common Causes
- Faulty or misadjusted Transmission Range Sensor (TRS) / Park/Neutral Position (PNP) switch
- Open, short-to-ground, or short-to-battery in the TRS circuit wiring or connectors
- Misadjusted, worn, or broken shift linkage
- Internal transmission failure (e.g., valve body, clutches) preventing neutral engagement
- Faulty PCM or software error (may require reprogramming)
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect TR sensor connector and wiring for damage or corrosion.
Step 3: Test sensor resistance and voltage output per manufacturer specs.
Step 4: Check shift linkage adjustment and ensure proper mechanical operation.
Step 5: If sensor and wiring are good, test PCM input/output signals.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
No, it is not safe. The vehicle may not start or may shift unexpectedly, leading to a potential accident. Have it diagnosed and repaired promptly.
How much does it cost to fix?▼
Typically $50-$150 for a new TR sensor plus labor. If wiring or PCM issues are found, costs can be higher.
5. Commonly Affected Makes
This is a manufacturer-specific code. The exact manufacturer is not confirmed in our current database.