Transmission Park Position Sensor Circuit High
The P07B4 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, which is critical for starting the engine and engaging the parking pawl. A high circuit condition typically means there is a short to voltage, a faulty sensor, or a wiring issue. This can prevent the vehicle from starting or cause incorrect gear position readings.
01. Most Common Causes
- Faulty park position sensor
- Short to voltage in sensor circuit
- Damaged wiring or connector
- Corrosion in electrical connections
- Faulty transmission control module (rare)
02. Symptoms You Will Notice
- Engine may not start or only start in neutral
- Check Engine Light illuminated
- Transmission stuck in park or limp mode
- Incorrect gear position display on dashboard
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect the park position sensor and wiring for damage or corrosion.
Step 3: Test sensor voltage and ground with a multimeter; compare to manufacturer specs.
Step 4: Check for shorts to power or ground in the sensor circuit.
Step 5: If wiring is OK, replace the park position sensor.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
No, it is not safe. The vehicle may not start or could shift unexpectedly, leading to a safety hazard. Have it diagnosed immediately.
How much does it cost to fix?▼
Typically between $50 and $150 for parts and labor, depending on the sensor location and labor rates.