Low or high voltage is often the real problem hiding behind a dozen unrelated fault codes. Here is how to test a heavy-duty truck's 12V system in a repeatable order, from state of charge and cranking voltage to voltage drop and parasitic draw.
Proformance Link app update is live: Home UI vehicle info, Workbench History, and Spanish language support. iOS v1.80 / Android v2.20B.
Recognize EGR cooler failure on diesel trucks—white smoke, coolant loss, related codes—and follow a practical diagnostic path before major repairs.
Learn how poor DEF quality causes SCR faults, crystallization, sensor errors, and engine derates—plus how to diagnose and prevent downtime.
Learn the most common NOx sensor fault codes for diesel trucks, including SPN 3226, SPN 3216, P2201, and P229F. Understand causes, symptoms, and diagnostic solutions.
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.
A symptom-first guide to diagnosing a heavy-duty truck that will not start, complete, or respond correctly to DPF regeneration.
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 highlights: iPad interface optimization, Demo Mode improvements, new Ford vehicle demos, plus Help Center and Video Center shortcuts.
"How contaminated, diluted, or aged DEF causes SCR faults: the symptoms, how to test urea concentration, storage rules, and what to do when the wrong fluid was added."
Diagnose 12V electrical faults on heavy-duty trucks: battery state of charge, cranking and charging voltage, voltage drop testing, and parasitic draw."
Learn how diesel truck diagnostic tools help technicians diagnose emissions problems, troubleshoot aftertreatment systems, verify repairs, and reduce fleet downtime."
DEF quality is the foundation the entire SCR system rests on. Here is how dilution, the wrong fluid, heat aging, and concentration drift produce SCR efficiency codes — and how to test for them before you replace a sensor.
Low or high voltage is often the real problem hiding behind a dozen unrelated fault codes. Here is how to test a heavy-duty truck's 12V system in a repeatable order, from state of charge and cranking voltage to voltage drop and parasitic draw.
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JOIN NOW →Low or high voltage is often the real problem hiding behind a dozen unrelated fault codes. Here is how to test a heavy-duty truck's 12V system in a repeatable order, from state of charge and cranking voltage to voltage drop and parasitic draw.
Proformance Link app update is live: Home UI vehicle info, Workbench History, and Spanish language support. iOS v1.80 / Android v2.20B.
Recognize EGR cooler failure on diesel trucks—white smoke, coolant loss, related codes—and follow a practical diagnostic path before major repairs.
Learn how poor DEF quality causes SCR faults, crystallization, sensor errors, and engine derates—plus how to diagnose and prevent downtime.
Learn the most common NOx sensor fault codes for diesel trucks, including SPN 3226, SPN 3216, P2201, and P229F. Understand causes, symptoms, and diagnostic solutions.
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.
A symptom-first guide to diagnosing a heavy-duty truck that will not start, complete, or respond correctly to DPF regeneration.
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 highlights: iPad interface optimization, Demo Mode improvements, new Ford vehicle demos, plus Help Center and Video Center shortcuts.
"How contaminated, diluted, or aged DEF causes SCR faults: the symptoms, how to test urea concentration, storage rules, and what to do when the wrong fluid was added."
Diagnose 12V electrical faults on heavy-duty trucks: battery state of charge, cranking and charging voltage, voltage drop testing, and parasitic draw."
Learn how diesel truck diagnostic tools help technicians diagnose emissions problems, troubleshoot aftertreatment systems, verify repairs, and reduce fleet downtime."
DEF quality is the foundation the entire SCR system rests on. Here is how dilution, the wrong fluid, heat aging, and concentration drift produce SCR efficiency codes — and how to test for them before you replace a sensor.
Low or high voltage is often the real problem hiding behind a dozen unrelated fault codes. Here is how to test a heavy-duty truck's 12V system in a repeatable order, from state of charge and cranking voltage to voltage drop and parasitic draw.
Stay up to date with exclusive deals, news, and the latest updates — delivered straight to your inbox.
Every week you wait could cost you hundreds in unnecessary shop bills.
JOIN NOW →