Market: North America
Model: T680
Engine: PACCAR MX-13
Transmission: Eaton Fuller Advantage 10-speed automated
Evidence scope: documented T680 Advantage application; not universal to all T680 years
Model
Kenworth T680
Kenworth T680 model family. Numerical powertrain values are limited to the cited PACCAR/Kenworth application scope and are not generalized to every model year.
What concrete information can you get from this page?
Verified application example: North America · T680 · PACCAR MX-13 · Eaton Fuller Advantage 10-speed automated
VERIFIED FACTModel / system fact
The T680 is part of Kenworth’s on-highway heavy-truck family, with day-cab and sleeper configurations documented by Kenworth.
FAULT SEPARATIONWhen a symptom appears
For SPN/FMI events, store source address, occurrence count and same-timestamp engine/transmission/ABS messages rather than only the number.
FIRST MEASUREMENTBefore replacing parts
Before cranking/running tests, verify battery voltage-drop and ECM/TCM power/ground integrity under load so low-voltage network events are separated from mechanical faults.
Primary source: Kenworth T680 / trucks
Vehicle Identity and Application Matching
BrandKenworth
Related categories
RELATED SYSTEMS AND CODES
Technical topics in the same fault chain
Heavy-duty technical verification chain
This chain does not assume an exact engine or transmission code. Verify vehicle, build period, market and ECU/TCU identity before moving into technical atlases.
- Engine and transmission identity
- J1939 SPN/FMI
- Aftertreatment: DPF/SCR/DEF
- EBS/braking and retarder
- PTO/body interfaces
- Fleet-maintenance and service verification
Continue to workshop technical center → · Maintenance and ownership decisions →
Verified model-variant application graph
No exact model-variant binding is available in source data yet. The system does not infer variants from similar names.
Next technical research for this vehicle class
Model technical depth plan
This plan moves a model page from catalog identity to diagnosis and service decisions. Exact values are used only when verified for the specific application.
Use manufacturer service information and verified vehicle identity for exact OEM procedures, values and part applications.
6-step technical decision tree
- Verify identity
- Preserve first-event data
- Compare command and feedback
- Confirm with physical measurement
- Isolate root cause
- Retest under the same condition after repair
OEM EVIDENCE DOSSIER
Verified technical facts and application boundary
- The T680 is part of Kenworth’s on-highway heavy-truck family, with day-cab and sleeper configurations documented by Kenworth. [S1]
- Kenworth documented a T680 Advantage application pairing the PACCAR MX-13 with an Eaton Fuller Advantage 10-speed automated transmission. [S2]
- Kenworth expanded PACCAR TX-12 PRO availability with the MX-13 for T680/T880/W990 in 2025, so transmission fitment must be verified by model year and order configuration. [S3]
- PACCAR’s TX-12 page explicitly lists MX-13 compatibility and linehaul applications. [S4]
Verified application matches
The matches below are published only within the stated market, model-year and evidence scope. Fitment is not extrapolated to uncited variants.
Market: North America
Model: T680
Engine: PACCAR MX-13
Transmission: PACCAR TX-12 / selected TX-12 PRO applications
Evidence scope: current PACCAR/Kenworth compatibility must be checked by order configuration
System architecture and component relationships
- Treat engine ECM, transmission control, vehicle/gateway functions, ABS/EBS and aftertreatment as separate diagnostic layers; preserve event order with J1939 messages.
- On the MX-13 side, low/high-pressure fuel supply, boost/air management, EGR and DPF/SCR/DEF aftertreatment are interacting subsystems.
- For automated-transmission diagnosis, correlate engine torque request/actual torque, input/output speeds, commanded/engaged gear and clutch state in the same event capture.
DTC / SPN-FMI / symptom discrimination map
- For SPN/FMI events, store source address, occurrence count and same-timestamp engine/transmission/ABS messages rather than only the number.
- For low-power or derate complaints, correlate rail-pressure target/actual, boost target/actual, EGT sensor sequence, DEF dosing state and upstream/downstream NOx behavior.
- For shift complaints, separate engine-side derate/torque limiting from TCM input/output speed and clutch data so an engine torque restriction is not misdiagnosed as a transmission fault.
Measurement and diagnostic strategy
- Before cranking/running tests, verify battery voltage-drop and ECM/TCM power/ground integrity under load so low-voltage network events are separated from mechanical faults.
- For fuel-pressure complaints, record low-side supply and rail target/actual deviation at the same load point; do not condemn the rail sensor from one PID alone.
- For aftertreatment complaints, use a sequence of cold-sensor rationality, warm-up behavior, EGT ordering, differential pressure, then DEF/NOx response.
- After repair, reproduce the same load/temperature condition and verify SPN/FMI state, derate status and target/actual values together.
Exact pinouts, torque values, pressure thresholds or service limits are published only when explicitly verified by the applicable OEM service source.
Evidence provenance and primary sources
- Kenworth T680 / trucks · OEM-primary · 2026-08-15
- Kenworth T680 + MX-13 + Eaton Advantage application · OEM-primary · 2026-08-15
- Kenworth TX-12 PRO with MX-13 availability · OEM-primary · 2026-08-15
- PACCAR TX-12 official product data · OEM-primary · 2026-08-15
RELATED TECHNICAL TOPICS
Topics in the same system and fault chain
Technical Sources and Verification
SERVICE DECISION LINKS
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How to verify the technical identity
The same model name can carry different engines, transmissions, emissions packages and ECU software across years and markets. Verify VIN/chassis, engine code, production period and controller identity together before selecting parts or procedures. If an exact value is not supported, AutoAtlas does not fill the gap by guessing.
Model and variant research coverage
Kenworth T680 generation, engine, transmission, variant, DTC, common-problem and used-vehicle inspection research follows verifiable application links.
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Next technical step for this model
Confirm engine and transmission identity, review related DTC and system records, and preserve the same vehicle identity for used-vehicle or maintenance decisions.
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Sources & freshness
Sources & freshness
Exact technical values, prices and failure rates are not invented without verified vehicle/manufacturer evidence.