P2812 - Pressure Control Solenoid G Control Circuit/Open
The P2812 code indicates an open or malfunction in the control circuit of the pressure control solenoid G, which is part of the automatic transmission's hydraulic system. This solenoid regulates fluid pressure to the clutch packs, and an open circuit prevents proper solenoid operation, leading to transmission shifting issues. The powertrain control module (PCM) detects a voltage or resistance anomaly in the solenoid circuit.
1. Most Common Causes
- Faulty pressure control solenoid 'G' (open internal coil)
- Open circuit in the solenoid 'G' control wiring (broken wire, disconnected)
- Damaged, loose, or corroded terminals at the solenoid or PCM connector
- Internal PCM failure (damaged solenoid driver)
- Blown fuse in the solenoid power supply circuit
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Harsh or erratic shifting
- Transmission slipping or stuck in gear
- Reduced fuel economy
3. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for related transmission codes.
Step 2: Visually inspect the wiring and connectors for damage, corrosion, or loose connections.
Step 3: Test the solenoid resistance with a multimeter and compare to manufacturer specifications.
Step 4: Check for power and ground at the solenoid connector with the ignition on.
Step 5: If wiring and solenoid are okay, test the TCM/PCM output signals.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as the transmission may shift erratically or fail, potentially causing further damage.
How much does it cost to fix?▼
Repair costs typically range from $200 to $600, depending on whether the solenoid, wiring, or control module needs replacement.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.