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27 August, 2025

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Cummins X15 CM2450 X124B (2018 & Newer) Fault Code: 421 PID: PID 175 SPN: 175 FMI: 16 Engine Oil Temperature- Data Valid But Above Normal Operating Range- Moderately Severe Level

Circuit DescriptionThe engine oil temperature sensor is a variable resistor sensor and is used to measure the temperature of the...

27 August, 2025

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Cummins X15 CM2450 X124B (2018 & Newer) Fault Code: 4213 PID: SPN: 3695 FMI: 2 Aftertreatment Regeneration Inhibit Switch- Data Erratic, Intermittent, or Incorrect

Circuit DescriptionThe OEM truck manufacturer can install a permit switch in the dash or send an inhibit message via the...

27 August, 2025

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Cummins X15 CM2450 X124B (2018 & Newer) Fault Code: 4215 PID: SPN: 563 FMI: 31 Anti-Lock Braking (ABS) Active- Condition Exists

Circuit DescriptionCertain anti-lock braking (ABS) controllers communicate with the engine control module (ECM) through the SAE J1939 data link. Under...

27 August, 2025

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Cummins X15 CM2450 X124B (2018 & Newer) Fault Code: 4233 PID: SPN: 3515 FMI: 3 Aftertreatment 1 Diesel Exhaust Fluid Temperature 2 Sensor Circuit- Voltage Above Normal or Shorted to High Source

Circuit DescriptionThe aftertreatment diesel exhaust fluid (DEF) sensor is a smart device that communicates to the ECM via the J1939...

27 August, 2025

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Cummins X15 CM2450 X124B (2018 & Newer) Fault Code: 4234 PID: SPN: 3515 FMI: 4 Aftertreatment 1 Diesel Exhaust Fluid Temperature 2 Sensor Circuit- Voltage Below Normal or Shorted to Low Source

Circuit DescriptionThe aftertreatment diesel exhaust fluid (DEF) sensor is a smart device that communicates to the ECM via the J1939...

27 August, 2025

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Cummins X15 CM2450 X124B (2018 & Newer) Fault Code: 4243 PID: SPN: 3515 FMI: 10 Aftertreatment 1 Diesel Fluid Temperature 2- Abnormal Rate of Change

Circuit DescriptionThe aftertreatment diesel exhaust fluid quality sensor is a smart device that communicates to the ECM via the J1939...

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