EGR Sensor Circuit High Input
EGR sensor input voltage is higher than expected.
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What it means (plain English)
The EGR (Exhaust Gas Recirculation) system recycles exhaust gases back into the engine to reduce emissions. If the EGR sensor shows a voltage higher than 4.5 volts, the engine control module (ECM) thinks there's a problem with the sensor or wiring.
What the computer is actually seeing
The ECM monitors voltage from the EGR position sensor, expecting it to range from 0.5V (fully closed) to 4.5V (fully open). If it detects a voltage above 4.5V, it triggers this code.
What a healthy reading looks like
EGR position sensor should read between 0.5V and 4.5V for normal operation.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Inspect the wiring and connectors leading to the EGR sensor for damage or corrosion. If damaged, repair or replace accordingly.
- 22. With the ignition on, measure the voltage at the EGR sensor connector. Is it over 4.5V? If yes, the sensor is faulty, replace it. If no, proceed to step 3.
- 33. Check for shorts to power in the EGR circuit. Disconnect the EGR sensor, then check for continuity to ground. If resistance is low, trace the circuit for shorts. If no shorts, proceed to step 4.
- 44. Inspect the EGR valve for carbon buildup that may be keeping it stuck open. Clean or replace the EGR valve as necessary. If the problem persists, consider replacing the EGR sensor.
Common causes
- Damaged or shorted wiring
- Faulty EGR position sensor
- Corroded connectors
- Intake manifold leaks
- Carbon buildup in the EGR system
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's drivable but emissions may be higher, fix it soon.
Will this code come back after clearing it?
If the underlying issue isn't fixed, yes, it will return.
Why does this code appear with other EGR codes?
EGR-related codes often trigger together due to interconnected systems.
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