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.
Pinpoint Tests RH: REDUCTANT Heater: Introduction
2021 Ford Edge SE, 4WDSECTION Introduction
WARNING: This page is about a different car, the 2020 Ford F-550 Super Duty, 2020 Ford F-450 Super Duty, 2020 Ford F-350 Super Duty, 2020 Ford F-250 Super Duty, and 2020 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Regeneration may occur during normal operation. During regeneration, diagnostic procedures may display biased values. If a regeneration occurs during diagnostic procedures, allow the process to complete before continuing diagnostics.
This pinpoint test is intended to diagnose the following:
- reductant heaters
- harness circuits: GND, RDHTRC1, RDHTRC2, RDHTRC3 and RDHTRPWR
- glow plug control module (GPCM)
- reductant dosage control module (5H298)
Harness Side
| Circuit | Pin |
|---|---|
| GND (Ground) | 39 |
| RDHTRCTRL (Reductant Heater Control) | 40 |
| RDHTRPWR (Reductant Heater Power) | 48 |
Harness Side
| Circuit | Pin |
|---|---|
| RDHTRC1 (Reductant Heater Control 1) | 9 |
| GND (Ground) | 11 |
Harness Side
| Circuit | Pin |
|---|---|
| RDHTRC2 (Reductant Heater Control 2) | 1 |
| GND (Ground) | 2 |
Harness Side
| Circuit | Pin |
|---|---|
| GND (Ground) | 1 |
Harness Side
| Circuit | Pin |
|---|---|
| RDHTRPWR (Reductant Heater Power) | 14 |
| RDHTRCTRL (Reductant Heater Control) | 28 |
| RDHTRC1 (Reductant Heater Control 1) | 1 |
| RDHTRC2 (Reductant Heater Control 2) | 22 |
RENDER: 1.0x
NO RELATED
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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.