Gear Shift Position Circuit Malfunction
The P0914 code indicates a problem in the gear shift position circuit, which is responsible for detecting the position of the gear selector (e.g., Park, Reverse, Neutral, Drive). This circuit typically involves a sensor or switch that sends a signal to the transmission control module (TCM) or powertrain control module (PCM). A fault can cause incorrect gear position readings, leading to transmission shifting issues, starting problems, or safety concerns.
1. Symptoms You Will Notice
- Engine starts only in Park or Neutral, or not at all
- Transmission shifts erratically or fails to shift
- Check Engine Light illuminated
- Gear indicator on dashboard shows incorrect position
2. Most Common Causes
- Faulty or worn gear shift position sensor/switch
- Short to ground, short to voltage, or open circuit in the wiring harness
- Corroded, loose, or moisture-contaminated sensor connector
- Mechanical misadjustment of the shift cable or linkage
- Internal PCM failure (less common)
3. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the P0914 code and check for other related codes.
Step 2: Visually inspect the gear shift position sensor and its wiring for damage, corrosion, or loose connections.
Step 3: Test the sensor's resistance and voltage according to manufacturer specifications.
Step 4: Check the circuit continuity between the sensor and the TCM/PCM.
Step 5: If all else fails, test the TCM/PCM for proper operation or reprogramming needs.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. The vehicle may start in unintended gears or fail to shift properly, increasing the risk of an accident or transmission damage.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for parts and labor, depending on the specific vehicle and the exact cause (sensor replacement vs. wiring repair).
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.