P2729: Pressure Control Solenoid 'G' Control Circuit Low
The P2729 code indicates that the Powertrain Control Module (PCM) has detected a low voltage condition in the control circuit of the pressure control solenoid 'G'. This solenoid is part of the transmission's hydraulic system, regulating fluid pressure for clutch and band application. A low circuit condition typically results from wiring issues, connector problems, or a faulty solenoid, leading to improper transmission operation.
01. Most Common Causes
- Faulty pressure control solenoid 'G'
- Open or shorted wiring in the solenoid control circuit
- Poor electrical connection at the solenoid or PCM
- Damaged PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Transmission slipping or harsh shifting
- Delayed engagement or failure to shift
- Reduced fuel economy
03. Step-by-Step Diagnosis
Step 1: Scan for additional codes and freeze frame data.
Step 2: Visually inspect wiring and connectors for damage, corrosion, or loose connections.
Step 3: Test solenoid resistance with a multimeter (specs vary, typically 5-20 ohms).
Step 4: Check for voltage and ground at the solenoid connector with the ignition on.
Step 5: If wiring and solenoid are good, test PCM output or replace PCM as last resort.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as the transmission may slip or shift erratically, potentially causing internal damage. Limp mode may activate, limiting speed and drivability.
How much does it cost to fix?▼
Repair costs vary: solenoid replacement $150-$300, wiring repair $100-$200, PCM replacement $500-$1000. Diagnosis fee typically $100-$150.