Kobelco P0237 Boost Pressure (MAP) Sensor Troubleshooting Guide
Overview
P0237 is a common engine fault code on Kobelco SK-8 and SK-10 series excavators, also known as manifold absolute pressure / atmospheric boost sensor fault. The most obvious failure symptom is engine power drop and weak digging performance. This article follows standard field maintenance steps: inspect intake system first, then sensor wiring, and finally replace the MAP sensor if needed.
Image: P0237 boost sensor alarm displayed on Kobelco monitor
1. Fault Definition & Main Symptom
Fault Code: P0237
Official Name: Turbo Boost Pressure Sensor Circuit Low Input (MAP/Atmospheric Sensor)
Typical Symptom: Engine output power drops severely, slow digging, insufficient torque under load
Affected Models: Kobelco SK140-8, SK200-8,SK210-8, SK250-8,SK260-8,SK330-8,SK350-8,SK380-8,SK200-10,SK210-10, SK250-10,SK260-10, SK350-10,SK380-10 with Hino J05E / J08E engine
2. Step 1: Inspect Air Filter & Turbo Intake Rubber Hose
Take out the air filter, clean or replace if blocked with dust
Check all rubber pipes between turbocharger and intake manifold
Check pipe aging, cracks, rupture, loose clamps & air leakage
Repair or replace damaged intake hoses to eliminate air leak
Image: Turbo intake pipeline & air filter inspection area
图片：涡轮进气管路与空气滤芯检查区域
3. Step 2: Check MAP Sensor Plug & Wiring Harness
Locate boost pressure sensor mounted on intake manifold
Pull off sensor connector, check pin looseness, rust, oil & water corrosion
Inspect wiring for breakage, peeling insulation, short circuit
Re-plug or repair damaged wiring if any defects found
Image: Installation position of boost pressure MAP sensor
4. Step 3: Replace Boost Pressure MAP Sensor
If air filter, intake hoses, sensor plug and wiring are all intact without damage, the root fault is the failed boost pressure atmospheric sensor. Directly replace the original matching MAP sensor to clear P0237 alarm and restore engine power.
Quick Troubleshooting Flowchart
P0237 alarm + low power → Check air filter & turbo intake hose
Intake system normal → Check sensor plug & wiring breakage
Plug & wiring OK → Replace boost pressure MAP sensor
