Catch faults before they strand a truck - Full fleet visibility, 24/7. Talk to a fleet specialist

OTR REMOTE DIAGNOSTICS

See every truck. Make the next call fast.

OTR Remote Diagnostics gives you remote commands, fault codes and live data on every truck so you can decide the next step from anywhere.

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Truck-001
2021 Peterbilt 389 | Detroit Diesel DD15 Engine | VIN: 1XPFBT573NP567691
Overview
Health
Fault Codes (8)
Live Data
Commands
Reports
Vehicle Health
20
Health Score: 20/100
● Critical
Check Engine MIL Stop DPF Temp Derate
View detailed health analysis →
Fault Codes
5 Active 3 Inactive
SA 0 SPN 1569 FMI 31 Engine Protection Torque Derate
Active
SA 33 SPN 3226 FMI 5 AFT 1 Outlet NOx Sensor Circuit Open
Active
SA 33 SPN 5746 FMI 0 Aftertreatment 1 DPF Ash Load High
Active
SA 11 SPN 523530 FMI 4 ABS Wheel Speed Sensor LF Circuit Low
Inactive
View all 8 fault codes →
Vehicle Data
Check Engine Derate (55 MPH)
Engine RPM
767
Speed
0 mph
Engine Load
16 %
Coolant Temp
187 °F
Fuel Level
57 %
Battery
14.0 V
Aftertreatment
DEF Level
10 %
DPF Soot Level
64 %
SCR Derate
55 MPH
DEF Quality
32.5 %
SCR Efficiency
82.2 %
DPF Pressure
26 kPa
Vehicle Health
20
Health Score: 20/100
● Critical
Warning Lights
! Inspection Recommended
1 recommendation available below
Active Alerts & Anomalies (1)
☼
Regen Needed Info
Current: 118% | Threshold: >80%
Triggered: Just now
Recommendation: DPF soot level is elevated. Plan for regeneration during next available downtime.
Recommendations (1)
LOW DPF Regeneration Required

The Diesel Particulate Filter (DPF) soot level is elevated. This indicates the filter needs regeneration to prevent engine derating and potential damage. Schedule a parked regeneration or allow the vehicle to perform a highway drive cycle for passive regeneration.

Fault Codes
5 Active 3 Inactive
SA 0 SPN 1569 FMI 31 Engine Protection Torque Derate
Active
SA 33 SPN 3226 FMI 5 AFT 1 Outlet NOx Sensor Circuit Open
Active
SA 33 SPN 5746 FMI 0 Aftertreatment 1 DPF Ash Load High
Active
SA 11 SPN 523530 FMI 4 ABS Wheel Speed Sensor LF Circuit Low
Inactive
View all 8 fault codes →
Live • Just now
Cards
List
US
Metric
Engine & Vehicle Metrics
Engine RPM
763
Speed
0 mph
Engine Load
13 %
Coolant Temp
188 °F
Fuel Level
57 %
Battery
13.9 V
Speed & Cruise Control
Current Speed
0 mph
Cruise Control
—
Max Speed
65 mph
Park Brake
ON
Fluid Levels
Fuel Level
57 %
DEF Level
10 %
Coolant
96 %
DEF Quality
32.5 %
DEF Temp
74 °F
Idle Fuel
6.0 k gal

Commands

Execute diagnostic and control commands on this vehicle

Vehicle Command Readiness
Connection Status:Connected
Parking Brake:Engaged
Engine Status:Running (763 RPM)
Coolant Temp:187°F
Key Position:Off
DPF Soot Level:66%
✓ Ready for DPF Regeneration
Reset Fault Codes
Clear all active and inactive fault codes from ECU memory
Reset Aftertreatment
Reset aftertreatment system including DEF quality, SCR efficiency, and NOx sensors
Start Forced DPF Regen
Initiate a forced DPF regeneration cycle. Vehicle must meet pre-conditions.
Vehicle Report Preview
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Vehicle Diagnostic Report

Generated: 4/28/26, 11:41 AM
Vehicle: 2020 Freightliner Coronado • VIN: 3AKJHHDR2LSLR0510

Vehicle Information

Status
Online • Last Active: 4/28/26, 11:41 AM
Manufacturer
Freightliner
Model
2020 Freightliner Coronado
Engine
Detroit Diesel DD15
Odometer
653,044 miles
Engine Hours
15,372 hours

System Health

2 Warnings Active
Check Engine ACTIVE
MIL OK
Stop OK
DPF Temp OK
Derate ACTIVE

Live Data Parameters

Engine
RPM:604
Coolant Temp:189°F
Oil Pressure:N/A PSI
Oil Temp:N/A°F
Intake Temp:120°F
Boost Pressure:19 PSI
Aftertreatment
DPF Soot:97%
DPF Ash:N/A%
DEF Level:10%
DEF Temp:73°F
Regen Status:N/A
NOx In:592 PPM
NOx Out:120 PPM
Fuel & Air
Fuel Level:72%
Fuel Pressure:N/A PSI
Fuel Temp:N/A°F
Fuel Rate:N/A gal/hr
Air Intake Temp:120°F
Ambient Temp:68°F
Electrical & Other
Battery Voltage:13.8 V
Alternator Voltage:N/A V
Engine Load:16%
Throttle Position:N/A%
Vehicle Speed:N/A mph
Cruise Status:Inactive
Transmission
Current Gear:N/A
Trans Temp:N/A°F
Trans Oil Pressure:N/A PSI
Output Shaft Speed:N/A RPM
Brake & Chassis
Brake Air Pressure:N/A PSI
Parking Brake:Engaged
Service Brake:N/A
ABS Status:N/A
Exhaust Temps
Turbo Outlet:787°F
DOC Inlet:875°F
DPF Outlet:982°F
SCR Outlet:528°F
Vehicle Status
Engine Running:Yes
Key Position:N/A
PTO Status:N/A
Idle Time:287.5 hrs

Active Fault Codes (3)

SA 0 SPN 521049 FMI 31 ACTIVE
DEF System Warning - Reduced Power (25%)
Source: Unknown First Occurred: 4/28/26, 9:41 AM
DEF System Warning - Reduced Power (25%)
VIN: 3AKJHHDR2LSLR0510 | 2/11/26, 10:38 AM | Active
Fault Code
SPN 521049
SPN
521049
FMI
31
Source
SA 0
Status
Active
Description

The DEF (Diesel Exhaust Fluid) system has detected a problem and reduced engine power by 25% to protect the emissions system. This can be caused by low DEF quality, sensor issues, or system efficiency problems.

Symptom

DEF warning light is on. Engine power is reduced by 25%, causing slower acceleration and difficulty on hills.

Troubleshooting
  • 1 Check DEF fluid level - must be above 10%
  • 2 Verify DEF quality - drain and refill if fluid looks contaminated or crystallized
  • 3 Inspect for any other fault codes related to NOx sensors or DEF system
  • 4 Check DEF tank heater in cold weather - frozen DEF can cause this issue
  • 5 Test DEF injector spray pattern for proper operation
  • 6 Use diagnostic software to run SCR efficiency test
Repair Procedure
  • 1 Connect diagnostic software and document all fault codes
  • 2 Drain and refill DEF tank with fresh, certified DEF fluid
  • 3 Run SCR system efficiency test to check emissions performance
  • 4 Replace DEF injector if clogged or not spraying properly
  • 5 Replace NOx sensors if readings are incorrect
  • 6 Clear fault codes after repairs are confirmed
  • 7 Test drive to verify power is restored and warning light is off
Start DPF Regeneration
×

Checking vehicle status...

✓ Key On — Connected
✓ Engine at Idle — 750 RPM
✓ Vehicle Stopped — 0 MPH
✓ In Neutral — Gear 0
✓ Parking Brake — Set
✓ Ready to Start Regeneration
⚠ Safety Warning

Exhaust temperatures will be extremely high. Ensure vehicle is in a well-ventilated area away from flammable materials.

THE PROBLEM

Right now, you're managing your fleet blind.

You don't know there's a problem until the phone rings. By then, the truck is already in derate—or worse, stranded. You're making decisions with no information, coordinating repairs from 500 miles away, hoping it's not serious.

What if you could see inside every truck, 24/7? What if you got the alert before your driver even noticed? What if you could fix it remotely—no tech, no tow, no wait?

That's OTR Remote Diagnostics.

5:47 AM

Phone's ringing. Driver's stranded.

Your telematics shows the truck stopped in Missouri. But why? Is it critical or a nuisance code? Can he keep going or do you need a tow? Every hour you're guessing costs $400-$800 in lost revenue.

See all trucks at a glance

Critical, warning, normal, offline. Know exactly which trucks need attention before your drivers do. Search by truck number or VIN. See real-time location on the map.

7 trucks critical? You know before anyone calls.

Get started
HOW IT WORKS

Up and running in minutes

1

Plug In

Install OTR Remote Diagnostics module at each truck's 9-pin or OBD diagnostic port.

2

Connect

Cellular connection activates automatically. No setup required.

3

Monitor

24/7 data streaming to your dashboard. Every truck, every parameter.

4

Act

Send commands from any device, anywhere

Full diagnostic details, not just code numbers

See active and inactive codes with full troubleshooting info. Warning lights status. Code severity. What it means. What to do about it.

8 active codes? You see exactly what's happening and why.

Get started

From reactive to proactive

Stop waiting for the call. Start seeing everything.

✕ Without OTR Remote Diagnostics

Reacting to problems

  • ✕ Driver calls about a warning light—you have no idea what's happening
  • ✕ Trucks go into derate without warning, stranding drivers
  • ✕ Simple fixes require $150+ roadside service calls
  • ✕ No visibility into aftertreatment health until it's too late
✓ With OTR Remote Diagnostics

Preventing problems

  • ✓ See fault codes the instant they trigger, before the driver even calls
  • ✓ Get derate alerts with countdown timers to take action early
  • ✓ Reset codes and derates remotely—get trucks back on the road
  • ✓ Monitor aftertreatment data 24/7 across your entire fleet

Truck-003

2020 Freightliner Coronado | Detroit Diesel DD15 Engine | VIN: 3AKJHHDR2LSLR0510
Live · Just now

Engine & Vehicle Metrics

Engine RPM605
Speed0mph
Engine Load13%
Coolant Temp190°F
Fuel Level72%
Battery13.9V

Speed & Cruise Control

Current Speed0mph
Cruise Control—
Max Speed65mph
Park BrakeON

Fluid Levels

Fuel Level72%
DEF Level10%
Coolant97%
DEF Quality32.5%
DEF Temp72°F
Idle Fuel0.6k gal

Temperatures

Coolant190°F
Charge Air115°F
EGR423°F
Ambient67°F
Boost3psi
Turbo63%

Aftertreatment System

SCR Inducement Active
DEF Level Low
55 mph maxMax Speed
Level 3
Diesel Exhaust Fluid tank is running low. The system requires DEF to reduce NOx emissions.
Speed: 55 mph max Torque: 75% Next level: ~2 hours to Level 4
Action: Refill DEF tank immediately. Use only API-certified DEF fluid.

30+ parameters streaming in real-time

Speed, RPM, fluid levels, oil pressure, soot level, boost, temperatures. All streaming 24/7. Plus aftertreatment monitoring with derate alerts and countdowns.

SCR inducement active? You see the countdown and know exactly what action to take.

GET STARTED
EVERYTHING YOU NEED

Manage your entire fleet from anywhere

📊

Fleet Dashboard

See all trucks at a glance. Critical, warning, normal, offline. Instantly searchable by truck number or VIN.

⚠️

Fault Codes + Troubleshooting

View active codes with full troubleshooting info. Reset codes and derates remotely to get trucks moving.

📍

GPS Tracking

Real-time location for every truck. Current speed while driving, last-known position when offline.

📈

Live Data Streaming

DEF level, coolant temp, oil pressure, soot level, boost, and 30+ parameters streaming in real-time.

🔄

Remote Regen

Start a forced DPF regen from anywhere. Schedule commands to execute when conditions are right.

🔔

Derate Alerts

Know about derates before your driver. See countdown to lockout. Reset derates remotely.

Force regens and reset derates from your desk

Soot at 98%? Start a forced DPF regen remotely. Watch the temperatures climb in real-time. See elapsed time. Abort if needed.

No tech dispatch. No tow. No wait.

Get started
Forced DPF Regeneration In Progress
Started: 2/11/2026, 12:44:14 PM
22s
Elapsed Time
Exhaust Temperatures
Turbo
778°F
DOC Inlet
872°F
DPF Outlet
985°F
SCR Outlet
528°F
Engine & Emissions
RPM ↕
606
NOx In
610
PPM
NOx Out
127
PPM
Coolant
187°F
Turbo Vane
61%
SCR Eff.
84.4%
DPF Soot Level
97%
Reduced 2.0%
0%100%
Aftertreatment System
NOx Reduction
610
Inlet ppm
127
Outlet ppm
84.4%
SCR Eff.
DPF Health
97%
Soot Level
42
Pres kPa
61%
Turbo Vane
DEF System
10%
Tank Level
32.4%
Quality
74°
Tank Temp
EGR System
38%
Valve Pos
0
kg/hr
431°
EGR Temp
DEF Dosing System
0%
Supply Valve
0%
Dosing Valve
0%
Purge Valve
0
Regen Fuel kPa
Live Temperature Trends (Data points: 24)
COVERAGE

Works with your trucks

Full support for major diesel engines through 2026 model year.

2011+
Detroit Diesel
2011+
Cummins
2011+
Paccar MX
2014+
Volvo
2014+
Mack

Already have telematics?

Good. Keep it. Your ELD handles compliance—location tracking, hours of service. OTR Remote Diagnostics handles diagnostics—fault codes, derate alerts, remote commands. Different tools, different jobs. They work together.

THE MATH

One prevented incident pays for the subscription

$150–400
Typical roadside call
$500–1,500
Average tow cost
$800+
Per day of downtime
8.7 days
Avg downtime/truck/year

For a 75-truck fleet

75 trucks × 8.7 days × $800/day = $522,000/year in downtime

Prevent just 10% of that? You save $52,000/year.

OTR Remote Diagnostics costs less than $45,000/year for your entire fleet.

Get a quote for your fleet

Tell us how many trucks you run. We will send your custom pricing.

Or call us at (586) 799-4375

Frequently Asked Questions

General Questions
OTR Remote Diagnostics is a fleet diagnostic monitoring system. A device plugs into each truck's diagnostic port and streams data over cellular to a web dashboard. You can see fault codes, monitor engine data, and send remote commands (like forced regens) from anywhere. It's the same diagnostic intelligence we've built over six years with OTR Diagnostics, but now it works 24/7 without anyone being at the truck.
OTR Diagnostics requires a phone plugged into the truck. It's great for owner-operators and drivers who want to diagnose their own trucks. OTR Remote Diagnostics is always connected. It's built for fleet managers who need visibility across multiple trucks without relying on drivers to plug in and check. You can see what's happening with any truck from anywhere, and send commands (like forcing a regen or resetting fault codes) remotely.
Those are telematics platforms. They're built for compliance, location tracking, and driver behavior. They tell you where your trucks are and whether drivers are following HOS rules. They're good at that. OTR Remote Diagnostics is built for diagnostics. We tell you why your truck is going into derate, what's actually wrong with the engine, and we let you fix it remotely. We're not trying to replace your ELD. We're filling the gap your ELD can't fill. Your telematics system might tell you a truck has a check engine light. OTR Remote Diagnostics tells you it's a P20EE code, SCR efficiency below threshold, you've got 100 miles until derate, and here's what you can do about it right now. Most of our customers run OTR Remote Diagnostics alongside their existing ELD because they solve different problems.
Yes, OTR Remote Diagnostics requires a 2-truck minimum. It's designed for fleets, not single-truck operations. If you're running one or two trucks, OTR Diagnostics is a better fit for your needs. That said, the real power of OTR Remote Diagnostics is seeing patterns across your fleet: which trucks keep having the same issues, where your maintenance dollars are actually going.
Compatibility
OTR Remote Diagnostics supports: Detroit Diesel DD13, DD15, DD16 (2011 and newer), Cummins ISX, X15, ISB, ISL (2011 and newer), Paccar MX-13, MX-11 (2011 and newer), Volvo D11, D13, D16 (2014 and newer), Mack MP7, MP8 (2014 and newer). If you're running Class 8 trucks from the last 10-15 years, we likely support them. If you've got a mixed fleet, we can look at your specific trucks and tell you exactly what's covered.
OTR Remote Diagnostics monitors the truck's engine and aftertreatment systems. It does not monitor trailers, reefer units, or trailer ABS systems.
Installation
It plugs into the truck's 9-pin or OBD diagnostic port. Takes about 10 minutes per truck. No shop time, no downtime. We include detailed instructions with every device.
No. OTR Remote Diagnostics is a diagnostic tool that plugs into the standard diagnostic port. It does not modify any truck systems. This is the same port dealers and shops use for diagnostics.
Yes. Contact our support team to reassign a device to a new truck. We'll update your dashboard to reflect the change.
You'll receive an immediate notification that the device was disconnected. You'll also see exactly when and where it happened.
Features & Capabilities
Depending on engine make and model, you can: Force a DPF regeneration, reset fault codes, clear certain derates, and view live engine parameters. Not all commands are available on all engines. Check with our team for your specific trucks.
Alerts are sent within seconds of a fault code triggering. You'll know about problems before your driver calls you.
OTR Remote Diagnostics monitors trends in your engine data (soot levels, temperatures, regen intervals) that signal developing problems. Our AI diagnostics help identify issues before they become breakdowns. We're not just reading codes. We're watching the data that leads to codes.
OTR Remote Diagnostics provides full diagnostic information, not just code numbers. You'll see what the code means, what typically causes it, whether it's likely to cause a derate, and recommended next steps.
Data & Connectivity
OTR Remote Diagnostics stores data locally on the device when cellular coverage drops. Once the truck returns to a coverage area, all stored data automatically syncs to your dashboard. You won't lose any fault codes, alerts, or diagnostic data during the outage.
OTR Remote Diagnostics uses multi-carrier cellular connectivity to ensure the best coverage across the continental US. Cellular service is included in your subscription.
OTR Remote Diagnostics only tracks location when the truck ignition is on. When the truck is parked and off, location updates stop.
No. OTR Remote Diagnostics draws minimal power and has smart sleep features when the truck is parked. It won't drain your batteries even after extended periods of sitting.
Security & Privacy
You do. OTR Performance does not sell or share your fleet data with third parties. Your diagnostic data, fault history, and truck information belong to your company.
Yes. All data transmitted from OTR Remote Diagnostics devices is encrypted. Data stored in our cloud is protected with industry-standard security measures.
OTR Remote Diagnostics monitors the truck's diagnostic systems, not driver behavior. It tracks fault codes, engine parameters, and vehicle health. It does not record audio, video, or cab activity.
Dashboard & Users
Yes. You can configure which team members receive alerts for specific trucks or groups of trucks. Send driver alerts to dispatch, critical derates to management, and maintenance codes to your shop.
OTR Remote Diagnostics currently works through a web dashboard accessible from any device with a browser. A dedicated mobile app is coming soon.
Yes. You can export fault history, maintenance reports, and fleet health summaries from the dashboard.
Integrations
OTR Remote Diagnostics works alongside your ELD but doesn't replace it. Your ELD handles compliance (HOS, logs). OTR Remote Diagnostics handles diagnostics. Different tools for different jobs.
No. OTR Remote Diagnostics works alongside your existing ELD or telematics. Most of our customers run both because they solve different problems.
Pricing & What's Included
The hardware is purchased outright. It's yours. No leasing, no equipment return requirements.
Your subscription includes: 24/7 diagnostic monitoring, cellular connectivity (no separate data plan needed), dashboard access for your team, fault code alerts, remote command capabilities, AI-powered diagnostics, GPS tracking, software updates, and customer support.

Ready to take control of your fleet?

Get dealer-level diagnostics on every truck, accessible from anywhere, at any time.

Get Started

Questions? Call us: (586) 799-4375