P2047 — Reductant Injector Circuit/Open Bank 1 Unit 1 — 6.7 Cummins (SCR / DEF)

Diagnostic reference for 6.7 Cummins (SCR/DEF) 2013–present.

Updated October 15, 2026

What it means

The ECM has detected an open or fault in the DEF (reductant) injector circuit. On the 6.7L Cummins this is the DEF doser/injector circuit for the SCR system.¹

Most likely causes

1. DEF doser connector and wiring near the exhaust degraded by heat and corrosion causing an open circuit — The doser sits on the exhaust/SCR piping; heat and road exposure commonly damage the connector and wiring, producing an open in the injector circuit.¹
2. DEF doser (reductant injector) internal electrical failure — An open or failed coil/driver inside the doser will set a circuit/open fault for Bank 1 Unit 1.¹

How to diagnose

1. Verify code P2047 is present and check for related SCR/DEF codes (e.g., reductant system performance, DEF pressure, NOx sensor) to confirm system context.
2. Inspect the DEF doser connector and wiring in the exhaust/SCR area for heat damage, corrosion, chafing, or loose terminals; look for signs of moisture intrusion.
3. Check the DEF doser electrical connector for proper seating and terminal condition; inspect harness routing near hot exhaust components for melted insulation or abrasion.
4. Review freeze-frame and recent SCR operation data for reductant dosing activity and injector command vs. feedback to isolate circuit vs. performance issue.
5. If wiring and connector are intact, evaluate the DEF doser electrical characteristics per service information to confirm an open/fault in the injector circuit.
6. Confirm repairs by clearing codes and monitoring SCR/DEF readiness and reductant dosing status during a drive cycle; unresolved faults may cause warnings and derate.

Specs and test values

Common mistake to avoid

Replacing sensors, the doser or the SCR catalyst before testing the DEF. Old, heat-stored or diluted DEF loses strength and sets the same efficiency codes. Check it with a refractometer first. Source: Ram service bulletin 25-005-14 (Diesel Exhaust Fluid).

Parts and tools you may need

• Digital multimeter
• Scan tool with Cummins/SCR data
• Inspection light
• Terminal release tools
• Dielectric grease
• Heat-resistant loom/tape

Tools you’ll need

• OBD-II scan tool — Reads P2047 and related SCR/DEF codes and freeze-frame data to confirm circuit fault context and monitor reductant dosing status after repair.
• digital multimeter — Checks DEF doser injector circuit for open/short and verifies supply/return voltage and continuity through heat-damaged wiring near the exhaust.
• inspection mirror — Allows visual inspection of the DEF doser connector and harness routing in the tight, hot SCR/exhaust area for heat damage, corrosion, and chafing.
• terminal release tool set — Safely disconnects and reseats the DEF doser connector to inspect terminals for corrosion or looseness without damaging the housing.

Rough cost and difficulty

Typical US independent-shop figures; labor runs about $120–$180 per hour (dealers charge more). Confirm the diagnosis before buying parts.

When to see a pro

If the vehicle enters reduced power/derate, or if wiring repairs are needed in the high-temperature exhaust area, have a qualified diesel technician inspect and repair to avoid SCR damage or unsafe operation.

Check for recalls

Recalls are tied to your truck’s VIN, so check yours directly: enter the VIN at NHTSA’s recall lookup. Open safety recalls are repaired free at a dealer.

Sources

Repair videos: P2047 on the 6.7 Cummins '13+

Third-party videos, not ours — picked for this engine. Confirm anything against the factory service information for your truck.

Code p2048 Testing and Replacing Cummins 6.7 DEF Injector | Ram 2500 Service DEF System Message — Jouppi Outdoors · 113K views