SPN 102 — Intake Manifold #1 Pressure (Boost)
System: Air intake / Turbo
Boost pressure in the intake manifold after the turbocharger and charge air cooler.
Can I keep running it?
MEDIUM — fix soon
Low boost means low power and more smoke; high boost can overstress the engine. Usually drivable carefully to a shop.
Likely causes
- Boost leak at charge-air cooler or hoses
- Turbo or VGT actuator problem
- Clogged air filter
- Faulty boost sensor or plugged sensor port
- Exhaust restriction (DPF)
Checks & fixes (easiest first)
- Pressure-test the charge-air system for leaks
- Inspect CAC boots and clamps
- Check the boost sensor for oil/soot buildup
- Compare boost to barometric pressure with the key on, engine off
- Check VGT and DPF codes
Common FMIs with SPN 102
- SPN 102 FMI 0Value too high (most severe)
- SPN 102 FMI 1Value too low (most severe)
- SPN 102 FMI 2Data erratic, intermittent, or incorrect
- SPN 102 FMI 3Voltage above normal or shorted high
- SPN 102 FMI 4Voltage below normal or shorted low
- SPN 102 FMI 16Value too high (moderately severe)
- SPN 102 FMI 18Value too low (moderately severe)
Related codes
- SPN 641VGT Actuator
- SPN 105Intake Manifold #1 Temperature
- SPN 3251Aftertreatment 1 DPF Differential Pressure
FAQ
What does SPN 102 mean?
SPN 102 is Intake Manifold #1 Pressure (Boost). Boost pressure in the intake manifold after the turbocharger and charge air cooler.
Can I keep running with SPN 102?
Low boost means low power and more smoke; high boost can overstress the engine. Usually drivable carefully to a shop.
What causes SPN 102?
Boost leak at charge-air cooler or hoses; Turbo or VGT actuator problem; Clogged air filter; Faulty boost sensor or plugged sensor port; Exhaust restriction (DPF).