Exhaust Gas Recirculation "A" Control Circuit High
The EGR (Exhaust Gas Recirculation) control circuit is detecting a voltage or signal condition that is too high, indicating a malfunction in the EGR solenoid, wiring, or valve control circuit. This prevents proper exhaust gas recirculation, which reduces emissions and engine temperatures.
What You Might Notice
- Check engine light illuminated
- Rough or unstable idle
- Decreased fuel economy
- Loss of engine power
- Difficult starting or no-start condition
Most Common Causes
- 1
Failed EGR solenoid
The EGR solenoid coil is shorted or stuck open, causing excessive voltage draw in the control circuit. This is the most common cause of this code.
- 2
Wiring short to battery or ground
The EGR control circuit wiring is shorted to positive voltage or ground, creating an abnormal high voltage signal to the ECU.
- 3
Fouled or stuck EGR pintle
Carbon buildup on the EGR valve pintle causes it to stick in an open position, affecting valve control and sensor readings.
- 4
Bad connector or corrosion
Corrosion, loose pins, or damaged connectors in the EGR solenoid circuit prevent proper signal transmission to the ECU.
How to Diagnose It
- 1
Check Failed EGR solenoid — The EGR solenoid coil is shorted or stuck open, causing excessive voltage draw in the control circuit. This is the most common cause of this code.
- 2
Check Wiring short to battery or ground — The EGR control circuit wiring is shorted to positive voltage or ground, creating an abnormal high voltage signal to the ECU.
- 3
Check Fouled or stuck EGR pintle — Carbon buildup on the EGR valve pintle causes it to stick in an open position, affecting valve control and sensor readings.
- 4
Check Bad connector or corrosion — Corrosion, loose pins, or damaged connectors in the EGR solenoid circuit prevent proper signal transmission to the ECU.
How to Fix It
- 1
Replace EGR solenoid
Test the EGR solenoid for continuity and resistance. If out of specification or shorted, remove and install a new OEM solenoid, ensuring proper connector seating.
- 2
Inspect and repair wiring
Visually inspect the EGR control circuit wiring for cuts, abrasions, or exposed insulation. Trace the circuit for shorts to battery or ground, repair or replace damaged wire sections as needed.
- 3
Clean or replace EGR valve
Remove the EGR valve and inspect the pintle for carbon deposits. Clean thoroughly with appropriate solvent or replace the valve if damage is found or cleaning is ineffective.
- 4
Check and clean connectors
Disconnect the EGR solenoid connector and inspect for corrosion, pushed-out pins, or debris. Clean contacts with electrical contact cleaner and verify secure reconnection.
Need a deeper diagnosis?
Search for related repair guides or browse by system.