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
HEAVY-DUTY TECHNICAL DOSSIER
Kenworth T680 Technical Dossier
Manufacturer identity, verified technical facts and a measurement-led heavy-duty diagnostic backbone.
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
Verified oil, fluid or maintenance value
- PACCAR MX-13: 12.9 L engine displacement, 405–510 hp and 1,550–1,850 lb-ft torque range.
- PACCAR TX-12 automated transmission and PACCAR DX-40 tandem axle are listed on the current T680 powertrain page.
- 12.9 L is engine displacement, not engine-oil fill capacity. Oil fill quantity must be verified against the correct MX-13 model-year/operator manual.
Official source: Kenworth T680 official product page
Official source: PACCAR Powertrain official resources and MX operator manuals
This value applies only to the year, market, engine and driveline scope above and is not extrapolated to another variant.
Verified product information
- The T680 is part of Kenworth’s on-highway heavy-truck family, with day-cab and sleeper configurations documented by Kenworth.
- Kenworth documented a T680 Advantage application pairing the PACCAR MX-13 with an Eaton Fuller Advantage 10-speed automated transmission.
- 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.
- PACCAR’s TX-12 page explicitly lists MX-13 compatibility and linehaul applications.
System and diagnostic matrix
J1939 / CAN and source address
Symptom → event → live data → physical measurement → root cause → verification under load
Engine ECU / fuel / boost
Symptom → event → live data → physical measurement → root cause → verification under load
DPF / SCR / DEF / NOx
Symptom → event → live data → physical measurement → root cause → verification under load
EBS / ABS / pneumatic brakes
Symptom → event → live data → physical measurement → root cause → verification under load
Transmission / retarder / torque messages
Symptom → event → live data → physical measurement → root cause → verification under load
PTO / body-builder / auxiliary power
Symptom → event → live data → physical measurement → root cause → verification under load
Derate / engine protection
Symptom → event → live data → physical measurement → root cause → verification under load
Telematics / gateway / fleet network
Symptom → event → live data → physical measurement → root cause → verification under load
Sources
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