DTC P21DD (PCM) - Reductant Heater A Current Too Low
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2019 Ford Transit-350 HD, 2019 Ford Transit-350, 2019 Ford Transit-250, 2019 Ford Transit-150, and 2019 Ford F-550 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
DTC DESCRIPTION P21DD (PCM) - REDUCTANT HEATER A CURRENT TOO LOW
| Description: | This DTC sets when the glow plug control module (GPCM) detects insufficient current draw from the reductant tank 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 . | ||