TurboMack Diesel ECM

SPN 103 FMI 1

Name: ECM Performance
Address: Fort Lauderdale, FL, 33325, US
Telephone: (888) 768-2447
Price range: $$-$$$

Turbocharger boost control and air-handling faults.

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System

Mack Turbo

Mack ECM Service

Diagnostic Overview

Mack fault code SPN1031 generally indicates turbocharger boost pressure below the expected range. Low boost can cause low power, smoke, poor acceleration, high soot output, and failed regeneration complaints. This is often caused by an air leak or turbo control problem.

Likely Causes

Charge-air cooler leak; loose intake boot; exhaust leak before turbo; sticking VGT; failed actuator; restricted air filter; weak turbo.

What To Check First

Pressure-test the charge-air system, inspect intake boots and CAC, check exhaust leaks, and compare commanded versus actual boost.

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Internal Linking

Related Turbo Fault Codes

View All Turbo Codes

PID 103

Mack fault code PID103 generally relates to turbocharger boost pressure or intake manifold pressure feedback.

SPN 103 FMI 0

Mack fault code SPN1030 generally indicates turbocharger boost pressure above the expected range.

SPN 103 FMI 9

Mack fault code SPN1039 generally indicates abnormal update rate or communication-related boost pressure data.

SPN 1127 FMI 14

Mack fault code SPN112714 is generally related to turbocharger or air-management performance requiring special diagnostic action.

SPN 1127 FMI 18

Mack fault code SPN112718 generally indicates a turbocharger or air-management value below the expected range.

SPN 641 FMI 13

Mack fault code SPN64113 points to a VGT actuator calibration or out-of-calibration condition.

View All Turbo Codes →