Gate Select Direction Circuit Low
The P2791 code indicates that the transmission control module (TCM) has detected a low voltage condition in the gate select direction circuit, which is responsible for determining the shift gate position (e.g., Park, Reverse, Neutral, Drive). This circuit typically uses a sensor or switch to communicate the selected gear to the TCM. A low voltage reading suggests a short to ground, open circuit, or faulty component, potentially causing incorrect gear selection or transmission malfunction.
01. Most Common Causes
- Faulty gate select direction sensor/switch
- Short to ground in the gate select direction circuit wiring
- Open circuit or poor connection in the harness or connector
- Failed transmission control module (TCM)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Transmission stuck in one gear or fails to shift
- Incorrect gear indication on the dashboard
- Vehicle may not start or shift out of Park
03. Step-by-Step Diagnosis
Step 1: Connect a scan tool and verify the P2791 code. Check for additional transmission-related codes.
Step 2: Inspect the gate select direction sensor/switch and its wiring for damage, corrosion, or loose connections.
Step 3: Using a multimeter, test the circuit for continuity and voltage. Compare readings to manufacturer specifications.
Step 4: If wiring and sensor are okay, test the TCM for proper operation or perform a software update if applicable.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
No, it is not recommended. The transmission may not shift correctly or could get stuck in a gear, leading to unsafe driving conditions or further damage.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and repair, depending on whether the issue is a simple wiring fix or requires replacing the sensor or TCM.