Transmission Park Position Sensor Circuit High Voltage
The P07B6 code indicates that the transmission control module (TCM) has detected a voltage signal from the park position sensor that is higher than the expected range. This sensor tells the TCM when the transmission is in park, and a high voltage reading can cause the TCM to misinterpret the gear position, potentially preventing the engine from starting or causing other transmission-related issues.
1. Symptoms You Will Notice
- Engine may not start
- Transmission stuck in park
- Check Engine Light illuminated
- Incorrect gear display on dashboard
2. Most Common Causes
- Faulty or worn park/neutral position switch 'A'
- Sensor circuit shorted to battery voltage (B+)
- Corroded, oxidized, or damaged connector pins at the sensor
- Excessive circuit resistance due to poor splices or ground
- Mechanical failure in the transmission shift linkage or selector mechanism
- Transmission control module (TCM) with outdated or corrupted software
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to retrieve the code and check for related codes.
Step 2: Inspect the park position sensor and its wiring for damage, corrosion, or shorts.
Step 3: Test the sensor's voltage and resistance per manufacturer specifications.
Step 4: If the sensor is faulty, replace it; if wiring is damaged, repair as needed.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
No, it is not safe because the vehicle may not start or may shift unexpectedly, posing a safety risk.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for parts and labor, depending on the vehicle and shop rates.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.