EGR Position Sensor Voltage
EGR position sensor voltage is out of range.
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What it means (plain English)
The Engine Control Module (ECM) is not receiving the correct voltage signal from the EGR position sensor. This sensor monitors how much exhaust gas is recirculated, and if it sends a bad signal, the engine may not run efficiently or could lose power.
What the computer is actually seeing
The ECM expects a voltage range from the EGR position sensor usually between 0.5V to 4.5V in reference to the closed and fully open positions.
What a healthy reading looks like
When the EGR is closed, voltage should be around 0.5V. When fully open, it should be around 4.5V. Any readings outside this range trigger the fault code.
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.
- 1Check for physical damage to the EGR position sensor wiring and connectors (wiggle test). If damaged, repair or replace as needed.
- 2Using a multimeter, measure the voltage at the EGR position sensor connector. If readings are outside 0.5V to 4.5V, further diagnostics are needed.
- 3If voltage is correct at the connector but the ECM still shows the code, test the EGR position sensor with a scan tool for the live data while manually actuating the EGR valve. If there's no changing voltage, replace the EGR position sensor.
- 4If the EGR position sensor is good, inspect the EGR valve operation. Check if it moves smoothly without any blockages. If it's stuck, clean or replace as necessary.
Common causes
- Faulty EGR position sensor
- Wiring or connector issues between the EGR sensor and the ECM
- EGR valve stuck open or closed
- Software issues in the ECM
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not recommended to drive for long periods as it may cause performance issues and increased emissions.
Will this code return after fixing?
If the underlying issue with the sensor or wiring is resolved, the code should not return.
Why does it pair with SPN 1290?
SPN 1290 relates to the EGR valve performance, which often fails along with the position sensor.
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