Transmission Park Position Sensor Circuit Intermittent
The P07B7 code indicates an intermittent or erratic signal from the transmission park position sensor/switch. This sensor tells the PCM (Powertrain Control Module) when the transmission is in Park. An intermittent signal can cause the vehicle to not recognize Park, leading to starting issues or unintended movement. The problem may be due to a faulty sensor, wiring issues, or a poor electrical connection.
1. Symptoms You Will Notice
- Engine may not start in Park
- Transmission may not shift out of Park
- Check Engine Light illuminated
- Intermittent no-start condition
2. Most Common Causes
- Faulty or internally worn park/neutral position switch 'A'
- Loose, corroded, or damaged connector pins at the sensor
- Chafed, cut, or broken wiring in the harness between the sensor and control module
- Poor or loose ground connection in the sensor circuit
- Intermittent TCM/ECM failure (less common, after ruling out other causes)
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Inspect the park position sensor and wiring for damage or corrosion.
Step 3: Test sensor resistance and voltage with a multimeter.
Step 4: Check for intermittent connection by wiggling harness while monitoring signal.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended because the vehicle may not recognize Park, increasing the risk of unintended movement. Have it diagnosed promptly.
How much does it cost to fix?▼
Typically $50-$150 for sensor replacement, plus labor if needed. Wiring repairs may cost more.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.