Post-Trip Diagnostic Report — Fleet Witness

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The Report That Runs Every Trip. Automatically.

No driver input. No technician intervention. No cloud upload. Fleet Witness analyzes your vehicle's J1939 data continuously and generates a complete, scored diagnostic report the moment the ignition turns off — ready to securely retrieve from any browser via WiFi.

The Scorecard

Four Dimensions. One Score. Instant Clarity.

Every report leads with a four-category scorecard — a fast, at-a-glance health assessment of the vehicle and the driver behavior. Scores are derived from actual trip data, not estimates. A fleet manager can review a day's worth of trucks in minutes.

Fuel Efficiency

Miles per gallon equivalent against fleet baseline. Identifies vehicles consuming more fuel than they should.

Driver Behavior

Hard brakes, over-speed events, hard acceleration, high idle. Direct input for driver coaching conversations.

Engine Health

Active and stored DTCs, parameter deviations, thermal anomalies. Your maintenance scheduling trigger.

Idle Discipline

Idle time vs. drive time, idle fuel burned. A direct line-item cost savings opportunity in every report.

What's Inside Every Report

Nine Sections. One Complete Picture.

The full report goes well beyond the scorecard — section by section, it gives your shop technician everything needed to prioritize work before the hood comes up.

Trip Summary

Vehicle ID, VIN, driver, timestamps, odometer, distance — full audit trail for every dispatch.

Last Fill Volume

Tracks each individual truck's daily fuel intake, without the need of separately metering individual fill post connections.

Fuel Economy & Speed

Total fuel, MPG, idle time & fuel, time over 65/70 mph, cruise control usage, engine load, PTO time.

Engine Temperatures & Pressures

Coolant, oil temp, oil pressure, boost, intake air, exhaust gas — avg and max. Every thermal anomaly caught.

Brakes & Transmission

Hard brake events, ABS activations, engine brake usage, trans temp, gear changes, skip shifts.

Driver Behavior & Electrical

Over-speed events, hard acceleration, RPM abuse, high idle events, battery voltage, alternator output.

Diagnostic Trouble Codes

Every DTC with PGN, SPN, FMI, module, plain-English description, occurrence count, and first-seen timestamp.

ECU Parameter Snapshot

Freeze-frame of key SPNs at trip end — engine speed, throttle, temps, pressures, battery, boost.

Technician Recommendations

Auto-generated action items based on trip data — schedule inspection, review DTCs, driver coaching flags.

How You Get It

Two Ways to Access. Zero Effort Either Way.

Every Fleet Witness unit generates the report automatically at trip end. How you retrieve it depends on whether you have Terminal Connectivity enabled.

Without Terminal Connectivity

WiFi — Any Browser, Any Device

Pull up alongside the truck, securely connect to the Fleet Witness WiFi embedded server from your phone, tablet, or laptop. No app to install. The report opens in your browser. Download or print on the spot.

Works on any smartphone, tablet, or laptop

With Terminal Connectivity

Automatic — Truck Pulls In, Data Arrives

When a Terminal Connectivity-enabled vehicle returns to your yard or maintenance bay, the Fleet Witness Terminal auto-harvests every report wirelessly. No one touches anything. Reports are waiting in your terminal when you're ready.

$100/truck OTA upgrade · Terminal hardware sold separately

Export Formats

Your Data, Your Format

Reports export as PDF for printing and filing, HTML for browser viewing, and JSON for integration with your existing fleet management or maintenance software. No proprietary format, no more SaaS vendor lock-in.

PDF · HTML · JSON — all standard formats

Sample Report

See Exactly What Your Tech Receives

This example is from a CNG-equipped vehicle and includes the optional CNG Fuel System section.

Live SampleVehicle TRK-4471 · Cummins X15N · Monday April 21, 2025 · Driver: J. Harrington · 228.9 miles

POST-TRIP DIAGNOSTIC REPORT

NOVICO Fleet Witness · Vehicle TRK-4471 · Monday, April 21, 2025 · Driver: D-2241 / J. Harrington

Scorecard

Fuel Efficiency

98/100

7.38 MPDGE

Driver Behavior

29/100

4 overspeed, 5 hard brakes

Engine Health

61/100

2 active DTC(s)

Idle Discipline

99/100

33 min idle / 0.8% fuel

Trip Summary

Vehicle ID	TRK-4471
VIN	1XPBD49X7PD123456
Driver	D-2241 / J. Harrington
Trip Start	2025-04-21 06:14:33
Trip End	2025-04-21 13:37:33
Duration	443 min (7h 23m)

Engine	Cummins X15N
Engine S/N	80358241
Transmission	Eaton Cummins Endurant HD
Odometer Start	187,342 mi
Odometer End	187,570 mi
Distance This Trip	228.9 mi

Fuel Economy & Speed

Total Fuel Used	31.0 DGE
Fuel Economy	7.38 MPDGE
Idle Time	33 min
Idle Fuel Used	0.26 DGE (0.8% of total)
Avg Engine Load	53.0%
PTO Time	0 min

Avg Speed	31.0 mph
Max Speed Recorded	69 mph
Time > 65 mph	29.6%
Time > 70 mph	12.7%
Cruise Control Used	50.1%
Distance	228.9 mi

Engine Temperatures & Pressures

Coolant Temp — Avg / Max	186.8 °F / 208.8 °F
Oil Temp — Avg / Max	210.8 °F / 226.7 °F
Oil Pressure — Avg / Min	53.5 PSI / 35.0 PSI
Boost Pressure — Avg / Max	27.5 PSI / 31.6 PSI
Intake Air Temp — Avg	120.6 °F
Exhaust Gas Temp — Avg / Max	801.7 °F / 986.2 °F

— Page 2 —

CNG Fuel System

Last Fill Volume	27.8 DGE
High Pressure Min / Max	727 / 3,796 PSI
Fuel Rail Pressure Min / Max	133 / 394 PSI
Fuel Temperature Min / Max	36 °F / 139 °F

Brakes & Transmission

Hard Brake Events	5
ABS Activations	2
Engine Brake Usage	16.5%
Service Brake Usage	10.5%

Trans Temp — Avg / Max	189.7 °F / 226.4 °F
Total Gear Changes	413
Skip Shifts	1

Driver Behavior & Electrical

Over-Speed Events (>70 mph)	4
Hard Acceleration Events	2
RPM Over 1700	10.1%
High Idle Events	4

Battery Voltage — Avg / Min	14.11 V / 12.82 V
Alternator Output (avg)	92.6 A

Diagnostic Trouble Codes (PGN / SPN / FMI)

2 ACTIVE fault(s) · 1 STORED fault(s) · 3 total codes retrieved from ECU

#	Status	PGN	SPN	FMI	Module	Description	Count	First Seen
1	ACTIVE	65270	102	1	Engine	Intake Manifold Pressure – Below Normal (Low Boost)	13	This trip
2	STORED	65262	3241	0	Aftertreatment	Exhaust Gas Temperature – Above Normal	5	3 days ago
3	ACTIVE	65226	100	1	Engine	Engine Oil Pressure – Below Normal (Low)	14	This trip

— Page 3 —

ECU Parameter Snapshot (Key SPNs at Trip End)

Parameter	Value at Trip End	Status
Engine Speed (SPN 190)	749 RPM	Idle
Throttle Position (SPN 91)	2.6%	Near closed
Coolant Temp (SPN 110)	197 °F	Normal
Oil Pressure (SPN 100)	46 PSI	Normal
Fuel Rate (SPN 183)	0.44 DGE/hr	Idle
Battery Voltage (SPN 168)	13.98 V	Normal
Intake Manifold Temp (SPN 105)	110 °F	Normal
Boost Pressure (SPN 102)	0.7 PSI	Idle
Turbo Speed (SPN 103)	2,014 RPM	Idle
Trans Output Shaft Speed (SPN 191)	0 RPM	Stationary

Technician Notes / Recommended Actions

ACTIVE DTC(s) detected — schedule immediate inspection before next dispatch.

Verify all STORED DTCs against last service record.

Review driver behavior score with driver — score 29/100 is below the 80-point threshold.

Cylinder #2 inspection is 87 days past due.

Fuel filter maintenance is due in 173 engine hours.

Next scheduled PM: _________________________

Generated by NOVICO Fleet Witness · Report timestamp: 2025-04-21 13:37:33 · Data source: J1939 CAN BUS (multi-PGN) · For fleet maintenance use only.

Ready to Put This Report to Work?

Fleet Witness generates this report automatically after every trip — for every vehicle in your fleet, on any fuel type, with no subscriptions and no Internet required.