EGRMack Diesel ECM

P2457

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

Exhaust gas recirculation valve, cooler, and flow faults.

Call Now Request a Quote Create Service Ticket

System

Mack EGR

Mack ECM Service

Diagnostic Overview

Mack fault code P2457 indicates EGR cooler efficiency below threshold. The ECM has determined that the EGR cooler is not reducing exhaust gas temperature as expected. This can affect NOx control, engine temperature, soot production, and aftertreatment performance.

Likely Causes

Restricted EGR cooler; coolant flow problem; carbon buildup; low coolant; stuck bypass valve; faulty EGR temperature sensor.

What To Check First

Check coolant level and flow, inspect EGR cooler restriction, review EGR temperature data, and verify any EGR cooler bypass operation.

⏵ Truck down? Fleet stalled?

Mack Code P2457? Get An Honest Diagnosis.

Send us your fault codes and operational context. Same-day quote, remote diagnostic available, ship-in service nationwide.

Create Service Ticket

Internal Linking

Related EGR Fault Codes

View All EGR Codes

P0401

Mack fault code P0401 indicates insufficient EGR flow.

P0402

Mack fault code P0402 indicates excessive EGR flow.

P040A

Mack fault code P040A generally relates to the EGR temperature sensor circuit.

P040B

Mack fault code P040B usually indicates an EGR temperature sensor range or performance issue.

SPN 2659 FMI 16

Mack fault code SPN265916 generally points to an EGR flow or EGR mass-flow condition above the expected range.

SPN 2659 FMI 18

Mack fault code SPN265918 generally points to EGR flow or EGR mass flow below the expected range.

View All EGR Codes →