Cummins fault code 5387
DOC Outlet Gas Temperature: reading above normal (most severe)
What it means
Cummins' description: Aftertreatment 1 Diesel Oxidation Catalyst Outlet Gas Temperature - Data Valid But Above Normal Operating Range - Most Severe Level.
SPN 4766 is Aftertreatment 1 Diesel Oxidation Catalyst Outlet Gas Temperature. FMI 0 means the sensor is working, but the value it reports is far above where it should be. This is the most severe 'high' level.
The DOC (diesel oxidation catalyst) sits ahead of the DPF and burns fuel and hydrocarbons to heat the exhaust for regeneration. Some engines have a separate aftertreatment fuel doser (the 7th injector) that sprays fuel into the exhaust for regen.
What the lamp means
A red stop lamp means Cummins treats this as serious. Stop the engine as soon as you can do it safely and get it checked before running it again.
Green, yellow, red: three ways this can look
The same code can be a quick fix or a reason to shut down. Match your situation to the closest example. Cummins rates this a red stop lamp code, so if the red lamp is on, go by the red example.
Keep an eye on it
A temperature sensor code that appears once and clears, with regens finishing normally.
Schedule a repair
Regens failing or taking much longer than usual, along with DOC or doser codes. Book diagnosis before the DPF loads up.
Stop and get help
Raw fuel smell, smoke out of the stack, or a stop lamp. Don't run it. Unburned fuel in the exhaust is a fire risk and can destroy the DPF.
Common causes
The sensor reading itself is out of range or the condition is real, so look at the system:
- Aftertreatment fuel injector clogged or coked up
- DOC face-plugged with soot or oil
- DOC catalyst worn out or contaminated
- Fuel or air leak at the doser assembly
- Exhaust leak ahead of the DOC
What you can check before calling
- Look for soot or fuel residue at the aftertreatment fuel doser and lines
- Check for exhaust leaks between the turbo and the DOC
- Note whether regens are completing or being interrupted
Clearing the code without fixing the cause usually brings it right back, and on emissions systems it can restart derate timers. For the bigger picture, read our guide: DPF regeneration explained: passive, active and forced.
Engines and sources
Listed by Cummins for: QSB 6.7 (DOC+ SCR), QSL 9 (DOC+ SCR), QSB 4.5. Cummins uses the same fault code numbers across its electronic engines, including on-highway models like the ISB/B6.7, ISL/L9 and ISX/X15, though not every code applies to every engine or software level. Source: Cummins Tier 4 Fault Codes. Always confirm with Cummins service information (QuickServe) for your engine serial number.
Same SPN, other failure types
- 4533 SPN 4766 FMI 3
DOC Outlet Gas Temperature Sensor Circuit: circuit voltage high / shorted high - 4534 SPN 4766 FMI 4
DOC Outlet Gas Temperature Sensor Circuit: circuit voltage low / shorted low - 5386 SPN 4766 FMI 2
DOC Outlet Gas Temperature: erratic or intermittent signal - 5388 SPN 4766 FMI 16
DOC Outlet Gas Temperature: reading above normal (moderately severe) - 5389 SPN 4766 FMI 15
DOC Outlet Gas Temperature: reading above normal (least severe)
Related DOC and aftertreatment fuel doser codes
- 5391 SPN 6882 FMI 9
DOC Temperature Sensor Module: abnormal update rate - 5392 SPN 6882 FMI 12
DOC Temperature Sensor Module: bad device or component - 5393 SPN 6882 FMI 3
DOC Temperature Sensor Module: circuit voltage high / shorted high - 5394 SPN 6882 FMI 4
DOC Temperature Sensor Module: circuit voltage low / shorted low - 5395 SPN 6882 FMI 11
DOC Temperature Sensor Module: root cause not known - 5396 SPN 6882 FMI 16
DOC Temperature Sensor Module: reading above normal (moderately severe)
Look up another code
Cummins fault code (like 1922), J1939 SPN and FMI (like SPN 3251 FMI 0), or an OBD-II code (like P0420).
Questions
What does Cummins fault code 5387 mean?
Cummins fault code 5387 is J1939 SPN 4766 FMI 0: Aftertreatment 1 Diesel Oxidation Catalyst Outlet Gas Temperature - Data Valid But Above Normal Operating Range - Most Severe Level. In plain terms: doc outlet gas temperature: reading above normal (most severe).
Can I keep driving with Cummins code 5387?
No. Cummins assigns this code a red stop lamp. Stop the engine as soon as it's safe and have it checked before running it again. Look at the green, yellow and red examples on this page to judge your situation.
What is the SPN and FMI for Cummins code 5387?
SPN 4766 identifies the part or system (Aftertreatment 1 Diesel Oxidation Catalyst Outlet Gas Temperature). FMI 0 describes the type of failure: reading above normal (most severe).
What usually causes Cummins code 5387?
The most common causes are: aftertreatment fuel injector clogged or coked up; dOC face-plugged with soot or oil; dOC catalyst worn out or contaminated.
Diesel down in the Midlands?
We work on Cummins-powered pickups, vans and medium-duty trucks across Lexington, Columbia and the Midlands, on site at your yard or roadside.