What Does P2794 Mean?
The TCM has detected voltage in the gear shift direction circuit that is below the expected range. This low voltage condition prevents proper communication about intended gear direction.
Common Causes
35%
Open circuit or broken wire in shift direction sensor circuit
25%
Poor ground connection at sensor or TCM
20%
Faulty shift direction position sensor with internal open circuit
15%
Corroded or damaged connector pins causing high resistance
5%
Low battery voltage or failing transmission control module
Diagnostic Steps
1
Step 1: Check battery voltage and charging system operation (should be 12.6V+ at rest, 13.8-14.5V running)
2
Step 2: Test sensor reference voltage supply from TCM (typically 5V or 12V depending on system)
3
Step 3: Check ground circuits for proper continuity and resistance (should be less than 0.5 ohms)
4
Step 4: Test sensor signal wire for open circuit between sensor and TCM
5
Step 5: Measure sensor output voltage across full range of motion and compare to specifications
Estimated Repair Cost
$150 - $900
Parts + labor, varies by vehicle and location
The TCM has detected voltage in the gear shift direction circuit that is below the expected range. This low voltage condition prevents proper communication about intended gear direction.
The most common cause of P2794 (Gear Shift Direction Circuit Low) is: Open circuit or broken wire in shift direction sensor circuit
Typical repair costs for P2794 range from $150 to $900, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Transmission may fail to shift properly or default to limp mode. Could result in unexpected gear behavior or loss of reverse capability.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2794 to identify the root cause.
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Quick Info
Category
Powertrain
System
Transmission Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
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