P20EE indicates a problem with the Exhaust Gas Recirculation (EGR) valve control circuit, specifically that the PCM is detecting a voltage out of range. The code is set when the EGR valve position sensor or its circuit does not match expected values.
The valve may be stuck open or closed, or its internal circuitry may have failed, causing incorrect voltage signals.
The sensor that reports valve position to the PCM can become shorted, open, or give erratic readings.
Corroded, cracked, or loose wires and connectors in the EGR circuit can produce voltage spikes or drops.
A leak or blockage in the vacuum line can prevent the valve from moving correctly, leading to abnormal sensor feedback.
Only after ruling out the valve, sensor, and wiring should a PCM fault be considered, as it is rarely the root cause.
The definition is universal; the diagnostics are engine-specific. Open your vehicle for the codes documented for it:
No. In most cases the PCM is not at fault; replacing it without verifying the valve, sensor, and wiring will likely not resolve the issue.
Yes. A valve that cannot close properly will send an out‑of‑range voltage to the PCM, triggering P20EE.
Cleaning can resolve the code if carbon buildup is preventing proper valve movement, but the sensor and wiring must also be inspected.
Yes. An improperly functioning EGR system can increase NOx emissions, causing the vehicle to fail emissions testing.