Detroit SCR efficiency code diagnostics cover the low SCR NOx conversion reading logged by the aftertreatment control module on DD Series (EPA 2007-current) GHG14 engines. This 3-page troubleshooting sheet lists the fault definition, the relevant monitor or note data, and a numbered diagnostic routine that ends in the correct wiring or component repair. It is drawn from TruckFaultCodes.com (© 2017) and applies to the GHG14 emissions calibration.
Official document details
| Brand | Detroit Diesel |
|---|---|
| Model coverage | DD Series engines (EPA 2007-current) |
| System / group | DTCs — SCR conversion efficiency |
| Suspect parameter (SPN) | SPN 4364 |
| Failure mode (FMI) | SCR conversion efficiency low |
| Emissions calibration | GHG14 |
| Dash lamps | MIL |
| Engine reaction | None |
| Verification | parked regeneration |
| Source / copyright | TruckFaultCodes.com, © 2017 |
| Pages | 3 |
| File size | 0.3 MB |
| Format / language | PDF / English |
Detroit SCR efficiency code table of contents
The routine first checks for other active codes, then uses DEF test strip A0005850202 to rule out diesel fuel or oil contamination of the fluid. DEF concentration is confirmed at 28-36% with a refractometer, the DEF lines are inspected, and the dosing unit is unbolted from the aftertreatment for a DEF quantity test that must dispense 108-132 mL (3.7-4.5 oz.). A parked regeneration then verifies that the conversion reading rises and holds above 85% (0.85).
- Fault code header and description (enabling conditions)
- Troubleshooting steps 1 to 13
- DEF contamination, concentration and quantity checks
- Charted parameters and parked regeneration
- Release criteria and support escalation
Applicable truck models
This sheet is part of the DD Series diagnostic trouble code library and addresses the SCR catalyst and DEF dosing unit. The Detroit SCR efficiency code procedure applies to Detroit DD Series (EPA 2007-current) engines running the GHG14 calibration, and the same code index is cross-referenced under the Detroit Series 60 (DDEC VI, EPA 2007) fault-code set. For engine identification and warranty details, see the Detroit Diesel official site.
Who needs this SCR efficiency code manual
It suits aftertreatment technicians on GHG14 Detroit DD Series trucks working a low conversion reading that has not yet triggered a derate. The contamination strip, refractometer window and 85% regeneration target keep the diagnosis grounded in measured values.
The full 3-page PDF is available in the DiagTechPro manuals library; a free account is required to download.
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