DTC P221D (DCU) - REDUCTANT Heater B Current Too High
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P221D (DCU) - REDUCTANT HEATER B CURRENT TOO HIGH
| Description: | This DTC sets when the reductant dosage control module (DCU) detects excessive current draw from the reductant pressure line heater. | ||
| Possible Causes: |
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| Diagnostic Aids: | The presence of this DTC may indicate the vehicle is operating in derate mode and may experience a loss of power. After repair, the vehicle may still display a system warning message. Drive the vehicle until the system warning message has cleared from the instrument cluster message center. | ||
| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| All | GO to PINPOINT TEST RH . | ||