P2426 - EGR Cooling Valve Control Circuit Low
The P2426 code indicates that the Powertrain Control Module (PCM) has detected a low voltage condition in the exhaust gas recirculation (EGR) cooling valve control circuit. This valve regulates coolant flow through the EGR cooler to reduce NOx emissions. A low circuit signal typically points to a short to ground, open circuit, or faulty valve solenoid.
01. Most Common Causes
- Faulty EGR cooling valve solenoid
- Short to ground in the control circuit
- Open circuit or damaged wiring/connector
- Corroded or loose electrical connections
- Failed PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Increased exhaust emissions
- Possible rough idle or poor engine performance
- Reduced fuel economy
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect the EGR cooling valve connector and wiring for damage, corrosion, or loose pins.
Step 3: Using a multimeter, check the valve solenoid resistance (typically 10-30 ohms) and compare to specs.
Step 4: Test the control circuit for short to ground or open by backprobing the PCM connector.
Step 5: If circuit tests pass, replace the EGR cooling valve; if circuit fails, repair wiring or replace PCM.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally safe for short trips, but prolonged driving may cause increased emissions and potential engine performance issues. Repair promptly.
How much does it cost to fix?▼
Typical repair costs range from $50 to $150 for parts (EGR cooling valve) and labor, depending on vehicle make and shop rates.