Transmission Park Position Sensor Circuit Performance/Low
The P07BB code indicates that the transmission control module (TCM) has detected a performance or low voltage issue in the park position sensor circuit. This sensor tells the TCM when the transmission is in park, which is critical for starting the engine and engaging the park lock. A fault can cause starting problems, incorrect gear indication, or transmission shifting issues.
01. Most Common Causes
- Faulty park position sensor
- Wiring or connector issues in the sensor circuit
- Low battery voltage or charging system problem
- Corrosion or poor ground connection
02. Symptoms You Will Notice
- Engine may not start or start only in neutral
- Transmission stuck in park or unable to shift out of park
- Check Engine Light illuminated
- Incorrect gear position display on dashboard
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Inspect the park position sensor connector and wiring for damage, corrosion, or loose connections.
Step 3: Test the sensor's voltage and ground supply with a multimeter.
Step 4: Check battery voltage and charging system output.
Step 5: If all else is good, replace the park position sensor.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. The vehicle may not start or could unexpectedly shift out of park, posing a safety risk.
How much does it cost to fix?▼
Typically between $50 and $150 for parts and labor, depending on the vehicle and shop rates.