What it means
DEF heater D current draw is below threshold — typically a partially-open winding.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
Reductant heater D warms DEF (AdBlue) so it can flow when cold. The control module monitors heater D's current while it is commanded on; P215E sets when the measured draw is below the expected threshold, consistent with a partially open heater element or resistance in its circuit.
Common causes
Most likely first.
- Reductant heater D element partially open
- Open or high-resistance wiring or connector
- Faulty heater control circuit
Symptoms
- Check engine light or NOx warning on
- AdBlue/DEF level or quality warning
- Possible no-start countdown after ignore period
- Failed emissions inspection (NOx)
How to diagnose it
- Review freeze-frame data and reductant-system scan information to confirm heater D was commanded on when current was judged too low.
- Inspect heater D's connector and harness for corrosion, loose terminals, broken strands, or chafing.
- Check heater D and its wiring for continuity or excessive resistance using the manufacturer's specification and procedure.
- Compare the heater D control command with its current feedback to distinguish a heater element fault from a control-circuit problem.
- If the heater and wiring pass, test the heater control circuit and module output according to the manufacturer's procedure.
Common fixes
- Clean and secure a loose or corroded heater D connector.
- Repair an open or high-resistance section of heater D wiring.
- Replace reductant heater D if its element is partially open.
- Repair the confirmed heater control circuit fault.
Can I keep driving?
Normal driving may continue at first, but a reductant-system warning or emissions-related no-start countdown can follow, especially if cold conditions prevent DEF flow. Follow any countdown and arrange repair promptly.
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.