P2792: Gate Select Direction Circuit High
The P2792 code indicates that the transmission control module (TCM) has detected a high voltage condition in the gate select direction circuit, which is part of the shift-by-wire system. This circuit is responsible for determining the driver's intended gear selection (Park, Reverse, Neutral, Drive). A high voltage reading suggests a short to power, a faulty sensor, or a wiring issue. This can prevent the transmission from shifting properly, leading to drivability concerns.
1. Most Common Causes
- Short circuit to battery voltage (B+) in the signal or control wire of the gate select actuator
- Faulty gate select actuator/solenoid with internal short to power
- Corroded, bent, or moisture-damaged pins in the actuator or TCM connector causing a bridge to a power line
- Damaged wiring (chafed insulation) contacting power supply wires
- Failed output driver inside the TCM (Transmission Control Module)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Transmission stuck in one gear or fails to shift
- Inability to select Park, Reverse, Neutral, or Drive
- Reduced fuel economy
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to retrieve all stored codes and freeze frame data.
Step 2: Visually inspect the gate select direction circuit wiring and connectors for damage, corrosion, or shorts.
Step 3: Test the gate select direction sensor/switch resistance and voltage according to manufacturer specifications.
Step 4: Check for shorts to power or ground in the circuit using a multimeter.
Step 5: If all else is normal, suspect a faulty TCM and perform further diagnostics or reprogramming.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
No, it is not safe. The transmission may not shift correctly or may get stuck in gear, increasing the risk of an accident. Have the vehicle towed to a repair shop.
How much does it cost to fix?▼
Repair costs typically range from $150 to $400, depending on the cause. Wiring repairs are cheaper, while replacing the TCM or sensor can be more expensive.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.