Error code · Trucks: SPN codes

SPN 118 — Air pressure, brake circuit 2

Don’t put off the repair

Open this code in the appDownload the app

A fault code doesn’t yet mean the unit or sensor itself is faulty: often it’s the plug and connector leading to it.

What you can do yourself

  1. This is the pressure in the brake circuit 2 air tank.
  2. Check the compressor, the pressure regulator and air leaks (listen for hissing).
  3. Most often the air escapes around the air dryer — through its gaskets and fittings.
  4. FMI 2, 3, 4, 5 — the pressure sensor, its connector or wiring — go to an auto electrician.
  5. FMI 9, 13, 19 — the pressure value isn’t arriving over the CAN bus from another control unit. The air itself may be fine: compare with the air pressure gauges on the dashboard.
  6. Electrics (sensors, valves, wiring, control unit) — to an auto electrician. Leaks and mechanical faults — to an air brake specialist.

Stop and don’t drive on if:

  • The low air pressure light is on or the buzzer sounds
  • The air pressure gauges on the dashboard are below the normal range or dropping
  • The brakes have got worse, or the vehicle is braking by itself

Add the FMI — the second number of the code. It shows what exactly is wrong with the parameter.

Source: Eaton ServiceRanger: Endurant XD (TRTS0960), Fault Code 162

The explanation comes from the error code reference in the AvtoElektrik PRO app.

The second number, FMI: what exactly is wrong

A truck code is two numbers: SPN (which part) and FMI (what is wrong with it). Tap your FMI and the app opens the meaning of that exact code.

With this FMI — stop: FMI 1, 17, 18

Low air in the brakes: stop in a safe place, switch on the hazard lights and don’t drive on — the brakes work on air. Don’t move off until the pressure builds up to normal and the low air pressure light goes out.

Need a mechanic’s help?

Couldn’t fix it yourself? Oleg, an auto electrician, does computer diagnostics and repairs: he comes out anywhere in Almaty or sees you at his workshop.

Truck computer diagnostics in AlmatyCall: +7 701 121 11 10

Want to figure it out yourself?

Oleg’s course “Car computer diagnostics with a scan tool”: how to hook up a scanner, read codes and live data, and use them to find the cause. The first lessons are free.

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Nearby codes

All codes in Trucks: SPN codes →

Who keeps this reference

The reference is kept by Oleg Dmitriev, an auto electrician from Almaty with 26 years of experience: computer diagnostics of cars and trucks, repair of control units (ECUs). Can’t find the cause? Message him.

Oleg’s auto electrician websiteWhatsApp +7 701 121 11 10