P0405: Exhaust Gas Recirculation (EGR) Sensor A Circuit Low
The EGR position or pressure sensor voltage is too low.
Green, yellow, red: three ways P0405 can look
The same code can be a quick fix or a reason to pull over. Match your situation to the closest example.
Keep an eye on it
Drives normally.
Schedule a repair
Returns or drivability change. Repair soon.
Stop and get help
Limp mode. Get it diagnosed.
Symptoms you might notice
- Check engine light
Common causes, cheapest first
- Failed sensor
- Wiring shorted to ground
- Connector problem
What you can check before calling
- Check the sensor connector
A code points to a system, not a part. Replacing parts based on the code alone is how people spend money without fixing the problem. Testing confirms the cause first.
Generic codes (second character 0) mean the same thing on every vehicle. Some manufacturers add their own details, so check service information for your exact vehicle.
More egr codes
Look up another code
Cummins fault code (like 1922), J1939 SPN and FMI (like SPN 3251 FMI 0), or an OBD-II code (like P0420).
Questions
What does P0405 mean?
P0405 means "Exhaust Gas Recirculation (EGR) Sensor A Circuit Low". The EGR position or pressure sensor voltage is too low.
Can I drive with code P0405?
It depends on what the vehicle is doing. Green: Drives normally. Yellow: Returns or drivability change. Repair soon. Red: Limp mode. Get it diagnosed.
What causes P0405?
The most common causes are: failed sensor; wiring shorted to ground; connector problem.
Is P0405 a serious code?
It can be. Limp mode. Get it diagnosed.
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