Truck Fault Codes

International A26 SPN 412 FMI 0 — EGR Temperature Above Normal

SPN 412 FMI 0 on an International A26 means EGR temperature after the EGR cooler is above the normal operating range. The cooler is not rejecting adequate heat from the recirculated exhaust. Check EGR cooler coolant flow, inspect the bypass valve, and look for signs of coolant loss. International ServiceMaxx provides EGR temperature and cooler performance data.

Code Details

Structured details for SPN 412 FMI 0
Display codeSPN 412 FMI 0
SPN412
FMI0
OEM codeNone listed
ManufacturerInternational
SystemEngine — EGR system
ComponentEGR cooler / EGR temperature sensor
Source addressUnknown or not applicable
Severitymedium
Review statussource backed
Source confidencemedium
Last reviewed2026-06-12

Plain-English Meaning

The International A26 EGR cooler reduces the temperature of recirculated exhaust gas before it re-enters the intake manifold. When post-cooler EGR temperature is too high, the cooler is not performing adequately. Common causes include restricted coolant flow to the cooler, an EGR bypass valve stuck in the open position, or internal cooler scaling or failure. High EGR temperature entering the intake reduces charge efficiency and can accelerate intake system wear.

SPN 412 is Engine EGR Temperature in J1939. FMI 0 indicates a value above the normal operating range. On International A26 engines, the EGR temperature sensor monitors the cooler outlet temperature. ServiceMaxx can display this temperature alongside EGR valve position, EGR cooler bypass valve status, and coolant temperature to provide a complete picture of EGR cooler performance and identify which component is responsible for the elevated temperature.

Common Symptoms

  • Check engine lamp active
  • Elevated intake charge temperature readings from hot EGR gas
  • Possible coolant loss if the EGR cooler has an internal leak alongside the temperature fault
  • May appear alongside coolant temperature faults if EGR cooler bypass is sending hot exhaust to the cooling circuit

Possible Causes

Possible causes may include the items below. The list is not a parts diagnosis.

  • Restricted coolant flow through the EGR cooler from scaling or a supply blockage
  • EGR cooler bypass valve stuck open, sending uncooled EGR to the intake
  • Internal EGR cooler scaling reducing heat transfer area
  • EGR cooler structural failure — tube crack or internal separation
  • EGR temperature sensor reading above actual temperature

First Checks

  • Connect International ServiceMaxx and monitor EGR outlet temperature and bypass valve position together
  • Check EGR cooler bypass valve operation in ServiceMaxx — a stuck-open bypass is a common cause of this fault
  • Verify coolant level and confirm coolant is flowing to the EGR cooler
  • Inspect for coolant consumption or white exhaust that would indicate an internal EGR cooler leak
  • If bypass valve and coolant flow are normal but temperature remains above threshold, inspect the cooler physically for scaling or structural failure

Can I Keep Driving?

The A26 is typically still operable with SPN 412 FMI 0 active, but high EGR temperature affects combustion quality and intake system longevity. Elevated coolant consumption alongside this fault requires more urgent attention.

Related Lookup Pages

Sources

  • International Trucks Service Support Public Resources International Trucks / Navistar International · oem · accessed 2026-06-11 · confidence medium

    Source: International Trucks / Navistar International, International Trucks Service Support Public Resources. This page paraphrases factual fields only and is not a substitute for the original document.

    Open source
  • SAE J1939 Standards Collection SAE International · official · accessed 2026-05-05 · confidence medium

    Source: SAE International, SAE J1939 Standards Collection. This page paraphrases factual fields only and is not a substitute for the original document.

    Open source

FAQ

What is the EGR cooler bypass valve on the International A26?

The EGR cooler bypass valve is a control valve that can route exhaust gas either through the EGR cooler (for normal cooled EGR operation) or around it (to warm up the engine faster in cold conditions). When the bypass valve sticks open at operating temperature, uncooled exhaust gas enters the intake, raising EGR temperature significantly above the normal cooled value. ServiceMaxx can read the bypass valve commanded and measured position to confirm whether it is stuck open.

How does high EGR temperature on the A26 affect the engine over time?

Hot EGR gas entering the intake reduces charge air density, which can affect combustion efficiency. Over extended periods of elevated EGR temperature, intake manifold components and EGR valve sealing surfaces can experience accelerated thermal wear. For short-term operation, the risk of immediate engine damage is low, but the fault should be diagnosed and repaired to maintain normal combustion conditions and engine longevity.

Can scaling inside the EGR cooler be cleaned on the International A26?

Internal scaling in the EGR cooler can sometimes be addressed through chemical cleaning procedures that flush the coolant passages. Whether cleaning is viable depends on the severity of the scaling and whether any structural damage has occurred to the cooler tubes. ServiceMaxx thermal performance data — comparing inlet and outlet temperatures under known conditions — can help assess whether the cooler has adequate remaining capacity or requires replacement.