What it means
The control module detects a low signal in the EGR sensor D circuit. The code identifies the circuit condition; the sensor’s function and the resulting EGR response depend on the vehicle.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
EGR sensor D sends a signal the control module uses to assess an EGR-related condition, with the exact sensor function depending on the vehicle. The module monitors the signal level in sensor D's circuit. This code sets when the signal is lower than expected, which can be caused by a signal wire shorted to ground or an internally shorted sensor.
Common causes
Most likely first.
- Signal line shorted to ground
- Sensor internal short
- Connector pins corroded - high contact resistance
Symptoms
- Check engine light on
- Pinging or knocking under load
- Power loss and hesitation
- Possible rough idle
- Failed emissions inspection (NOx)
How to diagnose it
- Record freeze-frame data and check EGR sensor D live data for a low signal when the fault occurs.
- Locate sensor D using vehicle service information and inspect its connector and harness for chafing, corrosion, loose pins, or contact with ground.
- Check the sensor D signal circuit and connector against the wiring diagram and manufacturer's specifications.
- Test the signal wire for a short to ground and inspect the connector for contact faults using the manufacturer's procedure.
- If the harness passes, test sensor D for an internal short before replacing it.
Common fixes
- Repair a sensor D signal wire shorted to ground.
- Clean or replace corroded or damaged connector terminals.
- Repair chafed wiring and secure it away from grounded metal.
- Replace EGR sensor D if it fails the specified circuit test.
Can I keep driving?
Avoid heavy loads if the engine pings, knocks, hesitates, or loses power, and arrange diagnosis soon. Continued driving with poor EGR control may affect NOx emissions and drivability.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.