Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSFORD2021EDGE SE, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 12 (ENGINE CONTROLS - POWERTRAIN DTC CHARTS & DESCRIPTIONS (DIESEL))DIAGNOSTIC TROUBLE CODE (DTC) CHARTS AND DESCRIPTIONSDTC P20C0 (PCM) - REDUCTANT HEATER B CONTROL CIRCUIT HIGH
2021 Ford Edge SE, 4WD
DTC P20C0 (Pcm) - REDUCTANT Heater B Control Circuit High
2021 Ford Edge SE, 4WDSECTION DTC P20C0 (Pcm) - REDUCTANT Heater B Control Circuit High
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2018 Ford Transit-350 HD, 2018 Ford Transit-350, 2018 Ford Transit-250, 2018 Ford Transit-150, and 2018 Ford F-550 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
P20C0 (PCM) - REDUCTANT HEATER B CONTROL CIRCUIT HIGH
| Description: | The PCM carries out a functional key ON, engine running (KOER) self-test for the glow plug system. During that test the PCM enables the glow plug control module (GPCM) which monitors the reductant heater circuits. When the GPCM detects that the RDHTRC2 circuit is drawing 0 amps for greater than 250 milliseconds, a short to voltage is suspect. The GPCM sends a message to the PCM, which sets this DTC. | ||
| Possible Causes: |
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| Diagnostic Aids: | The presence of this DTC may indicate that 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 . | ||
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.