Gate Select Actuator Circuit Low
The P0912 code indicates that the Powertrain Control Module (PCM) has detected a low voltage condition in the gate select actuator circuit. This actuator is responsible for moving the transmission's shift gate to select the appropriate gear range. A low voltage reading suggests a short to ground, open circuit, or a faulty actuator, which can prevent proper gear selection and cause transmission performance issues.
01. Most Common Causes
- Faulty gate select actuator
- Short to ground in the actuator circuit
- Open or damaged wiring/connectors
- Corroded or loose electrical connections
- Failed PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Transmission stuck in one gear or fails to shift
- Harsh or delayed shifting
- Vehicle may not start or move
- Reduced fuel economy
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm code P0912 and check for additional codes.
Step 2: Visually inspect the gate select actuator and its wiring for damage, corrosion, or loose connections.
Step 3: Test the actuator circuit voltage with a multimeter; compare to manufacturer specifications.
Step 4: Check for shorts to ground or open circuits in the wiring harness.
Step 5: If wiring is intact, test the actuator resistance and operation; replace if faulty.
Step 6: Clear codes and test drive to verify repair.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
No, driving with P0912 can cause unpredictable transmission behavior, including getting stuck in gear or failing to shift, which may lead to an accident or further transmission damage. It is best to have the vehicle towed to a repair shop.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and simple repairs like cleaning connections or replacing a fuse. If the actuator needs replacement, parts and labor can add $200-$500. PCM replacement is rare and more expensive.