SPN 5285 — Charge air cooler efficiency

Safe to driveEnough to reach the yard

J1939 code SPN 5285. Below — how the fault is worded at the factory by SITRAK, and what the second half of the code (FMI) means in the standard.

SITRAK

FMI 2

Insufficient charge air cooler efficiency. Scan tool code: P026A. Effect: Torque may be limited.

What FMI means in J1939

SPN 5285 FMI 25285/2 · 5285.2

data erratic or intermittent

Can I keep driving

Safe to drive. Below — how much time you have and what happens if you keep going.

What happens if you keep driving

Time you have: Enough to reach the yard

Boost is not reaching its target: turbo, intercooler or intake. The engine compensates with mixture and runs hotter than usual.

You will lose pull, burn more fuel and add overheating on long climbs. If you hear a whine or a whistle from the turbo, stop — the wheel is breaking up.

What to check on the spot

Inspect the air filter and charge-air hoses: leaks and cracks produce exactly these codes.

Nearby: intake / boost

• SPN 412EGR Temperature
• SPN 729Intake Air Heater Driver #1
• SPN 730Intake Air Heater Driver #2
• SPN 2630Charge Air Cooler Outlet Temperature
• SPN 2791EGR Valve Control
• SPN 3464Throttle Actuator Control Command 1
• SPN 3563Intake Manifold 1 Absolute Pressure
• SPN 3673Engine throttle valve 2 position
• SPN 5401Turbocharger wastegate actuator
• SPN 5541Turbocharger turbine outlet pressure

Scanner threw several codes at once? Paste the whole list — we will show which one is the root cause and which ones simply followed.