Transmission Park Position Sensor Circuit High
The P07B4 code indicates that the transmission control module (TCM) has detected a voltage signal from the park/neutral position (PNP) switch or sensor that is higher than the expected range. This switch tells the TCM when the transmission is in Park or Neutral, and a high circuit condition typically points to a short to voltage, a faulty sensor, or wiring issues. This can affect starting and shifting behavior.
1. Symptoms You Will Notice
- Engine may not start in Park or Neutral
- Transmission may not shift properly
- Check Engine Light illuminated
- Vehicle may start in other gear positions
2. Most Common Causes
- Faulty park/neutral position switch
- Short to voltage in the sensor circuit
- Damaged wiring or connector
- Corrosion or poor electrical connection
- Faulty transmission control module (rare)
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm the code and check for related codes.
Step 2: Visually inspect the park/neutral position switch and wiring for damage or corrosion.
Step 3: Test the sensor signal voltage with a multimeter; compare to manufacturer specs.
Step 4: Check for shorts to power or ground in the circuit.
Step 5: If wiring and sensor are okay, test the TCM for proper operation.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. The vehicle may not start or could shift unexpectedly, posing a safety risk.
How much does it cost to fix?▼
Typically $50-$150 for diagnosis and replacement of the switch or repair of wiring, depending on labor rates.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.