Injector Cylinder #2 Current Below Normal
The DD-652-5 (Detroit Diesel DD Series) diesel fault code means: Injector Cylinder #2 Current Below Normal. This is a moderate severity code.
This is a standard J1939 fault, not a proprietary code. DD-652-5 is how this equipment displays SPN 652 with FMI 5 (current below normal or open circuit) under the SAE J1939 standard used across heavy equipment. The same SPN can appear on any J1939-compliant machine regardless of brand — so cross-referencing it against your engine maker's documentation is valid even when the equipment brand differs.
- Keep driving?
- Yes, with caution
- DIY difficulty
- advanced
- Estimated cost
- $500-$2,200
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What Are the Symptoms of DD-652-5?
- Check Engine Light / Amber Warning Lamp illuminated
- Rough idle or misfire
- Noticeable power loss under load
- Black or white smoke from exhaust
What Causes DD-652-5? (Most Likely First)
- Failed injector solenoid Very Likely
- Harness corrosion Likely
Can I Still Drive with DD-652-5?
Yes, with caution. DD-652-5 is rated moderate severity. Keep trips short and get it diagnosed soon rather than waiting for symptoms to worsen.
Frequently Asked Questions
What is Detroit Diesel fault code DD-652-5?
Detroit Diesel fault DD-652-5 (SPN 652 FMI 5) indicates: Injector Cylinder #2 Current Below Normal. It is a moderate-severity fault and is commonly seen on DD13/DD15/DD16 engines in Freightliner and Western Star chassis.
Can I drive my Freightliner or Western Star with fault DD-652-5?
It depends on severity. Critical and serious faults trigger derate or engine shutdown — do not continue driving. Moderate faults usually allow continued operation short-term but schedule repair to prevent cascading aftertreatment damage.
How much does it cost to fix Detroit Diesel fault DD-652-5?
Estimated repair cost is $500-$2,200. Sensor/harness fixes fall at the low end; turbo actuator, injector, aftertreatment component, or head gasket repairs fall at the high end. Detroit DDDL software and sometimes factory parameter reset are required for proper reset.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose DD-652-5?
DDDL cylinder cutout confirms #2.
Valve cover off — inspect harness pass-through and connectors.
Swap #2 injector with #1; confirm which cylinder is misfiring.
Replace injector if cylinder fault follows it.
Sources 2
This page is built from documented references. Verify against your own service info before repair work.
- Perkins 854F-34T Engine Fault Code table, printed in the Genie ZX-135/70 Service Manual, Part No. 218700, September 2015printed page 240: SPN 652 FMI 5, "Engine Injector Cylinder #02 :Current Below Normal". The table is that engine maker's; it establishes what the J1939 SPN-FMI pair means, not that a Detroit Diesel display shows it.
- John Deere Operator's Manual, PowerTech 4.5 L and 6.8 L Tier 2 OEM Diesel Engines, OMRG33324 (Issue 16Feb04), reproduced as a supplement in Genie's telehandler parts library (doc 237949), "Listing of Diagnostic Trouble Codes"printed page 45-29: SPN 652 FMI 05, "Cylinder #2 EI Circuit Open". The table is that engine maker's; it establishes what the J1939 SPN-FMI pair means, not that a Detroit Diesel display shows it.
Which Vehicles Commonly Get DD-652-5?
- Freightliner Cascadia with DD15
- Freightliner Cascadia with DD13
- Freightliner Cascadia with DD16
- Western Star 4700 with DD13/DD15
- Western Star 4900 with DD15/DD16
- Western Star 5700 XE with DD15
- Freightliner M2 106 with DD13
- Freightliner M2 112 with DD13
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