TurboMack Diesel ECM

SPN 641 FMI 13

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 SPN64113 points to a VGT actuator calibration or out-of-calibration condition. The variable geometry turbo actuator must know its position accurately to control boost and exhaust pressure. If calibration is wrong or lost, the truck may have low power, overboost, underboost, or derate.

Likely Causes

Actuator out of calibration; failed calibration procedure; incorrect actuator; sticking VGT mechanism; wiring or power issue; actuator replacement without calibration.

What To Check First

Run the proper VGT actuator calibration with Tech Tool, verify actuator power and ground, and confirm the turbo vanes move freely.

⏵ Truck down? Fleet stalled?

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Internal Linking

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