Turn a $2,000 derate day
into a 20-minute fix.
Read the fault, run the fix and clear the derate yourself — from the cab, on your phone, with Paccar dealer-level commands. No tow. No diagnostic fee. No two-day appointment.
- Reset fault codes
- Forced DPF regen
- Reset DEF derate
- Reset EGR derate
- Purge SCR/DEF module
- Install a cleaned DPF
- Install a new DPF
- Evaluate the SCR system
- OTR Assist AI
- Live data monitoring
Replace a bill you've already paid before.
These aren't features — they're invoices you stop receiving. Average costs below are what members report paying shops and dealers before switching.
1 Clear a derate from the driver's seat Command: Reset DEF Derate · Reset EGR Derate Avoids on average $1,300 tow
A DEF or EGR derate is the most expensive fault an MX throws — not because of the part, but because a speed limit you can't clear means you're stopped on the shoulder. Fix the cause, clear the derate from the cab, and drive to the repair on your terms.
2 Burn off soot yourself Command: Forced DPF Regen Replaces a $300 shop regen
When soot loads up on an MX-11 or MX-13 and a passive regen won't cut it, the shop charges ~$300 and half your day to do what your engine can do parked. Run a forced regen in 30–45 minutes while you eat lunch.
3 Read & reset faults before anyone charges you Command: Reset Paccar Fault Codes Skips the $400 diagnostic fee
Shops charge ~$400 on average just to plug in and tell you what you could see yourself. Read the fault, see what it means in plain English, clear it after the fix — and only pay a shop when there's actual wrench work.
4 Test your SCR before it derates you Command: Evaluate the SCR System Prevents the next $2,000 surprise
Paccar's aftertreatment fails slowly, then derates you suddenly. Run the same system evaluation the dealer runs and catch a failing NOx sensor or DEF dosing problem weeks before it becomes a derate on a load.
5 Close out your own DPF service Command: Install a Cleaned DPF · Install a New DPF Ends the dealer-only visit
Cleaning or replacing the DPF is a bolt job — but the ECM has to be told which one it's looking at, and dealers charge a visit for that handshake. Two separate procedures, both in the app: one for a cleaned filter, one for a brand-new one.
6 Recover from bad DEF yourself Command: Purge SCR/DEF Module Ends the dealer-only purge
Contaminated or wrong-spec DEF leaves fluid sitting in the module long after you've drained the tank. Purge it from the app instead of booking the truck in for a procedure that takes minutes.
One derate. Two ways it can go.
Without OTR Diagnostics
With OTR Diagnostics
We've logged 22 million fault codes. Yours won't surprise us.
- Pattern-backed answers. When SPN 5246 shows on an MX-13, OTR Assist AI draws on the thousands of times our members have already hit it — what caused it, what fixed it, what it cost.
- 1,000,000+ commands sent, 100,000+ regens run. Every forced regen and derate reset sharpens the guidance for the next driver. A code reader shows you a number; OTR shows you what 10,500 members did about it.
- Paccar-specific depth. MX-11 and MX-13 — 2011 to 2024, and the deepest command set we offer on any engine: eight bi-directional functions.
The gauges Paccar didn't put on your dash.
Proof from the people paying the bills.
"This product paid for itself on the first use. It prevents small problems from becoming bigger ones. Live Data is my favorite feature — OTR is essential for smart owner-operators or small fleets."
"Money well spent. Customer service is excellent and the diagnostic subscription will save money. Being able to disable a derate, preventing highway shoulder breakdowns, is invaluable."
"MX-13 threw a DEF derate outside Amarillo at 10pm. Cleared it from the cab and delivered on time. A tow out there is $1,300 minimum."
"Had the DPF cleaned myself and just needed the ECM told about it. That used to mean a dealer appointment for a two-minute job."
"Filled with the wrong DEF at a truck stop. Purged the module myself instead of booking the truck in for a week."
"Stopped paying $400 every time a light came on just to be told it was nothing. I check it myself now and only go to the shop when there's real work."
Your Paccar is covered.
The next derate doesn't have to cost $2,800.
Every plan includes the OTR Link 2 adapter free ($299 value), all Paccar commands above, OTR Assist AI, live data, and US-based support from Detroit.