Transmission Range Sensor A Circuit Range/Performance
The P0706 code indicates that the Powertrain Control Module (PCM) has detected an issue with the transmission range sensor (TRS) circuit 'A'. This sensor tells the PCM which gear position (Park, Reverse, Neutral, Drive) the transmission is in. The 'range/performance' part means the signal from the sensor is out of expected range or not performing correctly, often due to a faulty sensor, wiring issues, or a misadjusted shift linkage.
1. Symptoms You Will Notice
- Check Engine Light illuminated
- Transmission stuck in limp mode or a single gear
- Incorrect gear display on dashboard
- Engine starts in any gear or fails to start in Park/Neutral
2. Most Common Causes
- Faulty or worn transmission range sensor (TRS)
- TRS misadjusted or improperly installed
- Sensor circuit wiring shorted to ground, shorted to power, or open
- Corroded, loose, or damaged connector terminals
- Misadjusted or damaged shift linkage or manual lever position sensor
- Internal PCM failure (rare)
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect the transmission range sensor and wiring for damage or corrosion.
Step 3: Test the sensor's resistance and voltage output per manufacturer specs.
Step 4: Check shift linkage adjustment and operation.
Step 5: If all else passes, replace the transmission range sensor.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. The transmission may go into limp mode, limiting speed and potentially causing unsafe driving conditions. Have it diagnosed promptly.
How much does it cost to fix?▼
Typically $50-$150 for the sensor part, plus labor (1-2 hours). Total cost can range from $150 to $400 depending on vehicle and shop rates.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.