12V Electrical Faults on Heavy-Duty Trucks: Battery and Voltage Diagnostics
Diagnose 12V electrical faults on heavy-duty trucks: battery state of charge, cranking and charging voltage, voltage drop testing, and parasitic draw."
Diesel Truck Diagnostics Blog
Latest Articles
How Truck Diagnostic Tools Reduce Diesel Truck Downtime
Learn how diesel truck diagnostic tools help technicians diagnose emissions problems, troubleshoot aftertreatment systems, verify repairs, and reduce fleet downtime."
Proformance Link — New Update Available September
Proformance Link app update is live: Home UI vehicle info, Workbench History, and Spanish language support. iOS v1.80 / Android v2.20B.
EGR Cooler Failure on Diesel Trucks: Symptoms, Codes, and Fix Paths
Recognize EGR cooler failure on diesel trucks—white smoke, coolant loss, related codes—and follow a practical diagnostic path before major repairs.
DEF Quality Problems: How Bad Fluid Triggers SCR Faults and Derates
Learn how poor DEF quality causes SCR faults, crystallization, sensor errors, and engine derates—plus how to diagnose and prevent downtime.
Common NOx Sensor Fault Codes Explained: Causes & Solutions
Learn the most common NOx sensor fault codes for diesel trucks, including SPN 3226, SPN 3216, SPN 4094, P2201, and P229F. Understand causes, symptoms, and diagnostic solu
How to Find Your NOx Sensor Part Number
Learn how to find your NOx sensor part number fast. Check the sensor label, identify upstream vs downstream, search by VIN or ESN, and verify NOx Sensor Tester compatibility.
OTR Diagnostics vs Proformance Link
Compare OTR Diagnostics and Proformance Link for heavy-duty trucks: J1939 basics vs OEM-level system access, service tests, and manufacturer-specific functions.
Proformance link:Update: New Versions & Features
Proformance Link update highlights: iPad interface optimization, Demo Mode improvements, new Ford vehicle demos, plus Help Center and Video Center shortcuts.
Recent Articles
VIN Decoder: How to Read Your Vehicle Identification Number Like a Pro
Learn how to decode the 17-character VIN: what each digit means, how to identify model year, engine, and plant, and why decoding matters before you buy or repair.
How Often Should You Change Truck Engine Oil?
A practical guide for fleet operators and heavy-duty truck owners to optimize oil change intervals based on driving conditions and oil type.
Understanding Critical Data Points in Heavy-Duty Truck Diagnostics: What Every Driver and Shop Needs to Know
Essential diagnostic data every driver and shop needs to know for preventive maintenance and avoiding costly downtime
How to Fix SPN 84 FMI 3 — Accelerator Pedal Position Voltage High: Causes & Solutions
SPN 84 FMI 3 means accelerator pedal position voltage is above normal. Learn the symptoms, common causes, how to diagnose it with a diesel diagnostic laptop, and the fix.
Live from TMC 2026 Nashville: Who Is Truly Speaking for the Drivers?
TMC 2026 Annual Meeting recap — from enterprise diagnostic giants to driver-focused tools. Proformance was on the floor in Nashville to show there's a better way.
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