Towable Air Compressor Fault Codes
Diesel-driven towable air compressors run jackhammers, sandblasters, and pneumatic tools on construction sites everywhere. Atlas Copco is the rental fleet leader (Sunbelt, United, Herc), with Sullair and Doosan / Ingersoll Rand close behind. Most run Kubota, Deutz, or CAT diesels coupled to a rotary-screw airend, with the Atlas Copco Xc4002 / Xc2003 controller managing engine, oil pressure, air temperature, and unload cycles. This hub covers the codes you actually see in the field.
47 fault codes documented· Atlas Copco / Sullair / Doosan · Towable + electric shop-air
Most Common Air Compressor Fault Codes
Showing 24 of 47 Air Compressor codes across Atlas Copco, Sullair, and Doosan / Ingersoll Rand, sorted by severity. Each links to causes, diagnostics, and common fixes.
ATLAS-COPCO-E001 critical
Engine Oil Pressure Low Shutdown Triggered
ATLAS-COPCO-E002 critical
Engine Coolant Temperature High Shutdown
ATLAS-COPCO-E003 critical
Air Outlet Temperature High Shutdown Triggered
ATLAS-COPCO-E004 critical
Compressor Airend Oil Pressure Below Safe Threshold
ATLAS-COPCO-E020 critical
Engine Overspeed Shutdown Triggered
DOOSAN-E001 critical
Engine Oil Pressure Low Shutdown Detected
DOOSAN-E002 critical
Engine Coolant Temperature High Shutdown
DOOSAN-E003 critical
Air End Discharge Temperature Too High Shutdown
DOOSAN-E004 critical
Air End Oil Pressure Low Shutdown Fault
DOOSAN-E020 critical
Engine Overspeed Shutdown, RPM Exceeded Limit
SULLAIR-E001 critical
Engine Oil Pressure Low Shutdown Triggered
SULLAIR-E002 critical
Engine Coolant Temperature High Shutdown
SULLAIR-E003 critical
Air End Discharge Temperature High Shutdown
SULLAIR-E004 critical
Compressor Oil Pressure Low Shutdown
ATLAS-COPCO-E005 serious
Compressor Oil Temperature Above Warning Threshold
ATLAS-COPCO-E021 serious
Engine RPM Signal Missing or Out of Range
ATLAS-COPCO-E050 serious
Emergency Stop Loop Open or E-Stop Activated
ATLAS-COPCO-E070 serious
Controller to ECM CAN Communication Lost
DOOSAN-E021 serious
Engine Speed Sensor Signal Lost or Out of Range
DOOSAN-E050 serious
Emergency Stop Circuit Activated or Safety Loop Open
DOOSAN-E070 serious
IPM to ECM CAN Communication Lost
SULLAIR-E021 serious
Engine RPM Signal Missing or Out of Range
SULLAIR-E050 serious
Emergency Stop Circuit Open or E-Stop Activated
SULLAIR-E070 serious
CAN Bus Link Lost Between WS Controller and Engine ECM
Compressor Brands
| Brand | Applications | Notes |
|---|---|---|
| Atlas Copco | XAS 185 / 375 / 800 towables, XATS / XAVS variants, XL/XR shop-air | Dominant in construction rental fleets. Diesel models run Kubota, Deutz, or CAT engines with Xc4002 / Xc2003 / Xc4004 controllers. |
| Sullair | 185, 260, 375, 750 towables; rotary screw shop-air | Hitachi-owned. Common in rental fleets alongside Atlas Copco. Different controller platform; codes vary. |
| Doosan / Ingersoll Rand | P185, P425, P600 towables | Doosan acquired the Ingersoll Rand portable power line in 2007. Same chassis families remain in service. |
Common Air Compressor Issues
- Air outlet temperature high (E003) -- low compressor oil, blocked oil cooler, excessive duty cycle
- Engine coolant temperature high (E002) -- radiator fouling from jobsite dust
- Battery voltage low (E010) -- worn battery in towable yard storage
- Compressor oil pressure low (E004) -- airend lubrication problem
- Fuel filter restriction (E031) -- contaminated diesel, missed service interval
- Engine overspeed (E020) -- stuck unloader valve or runaway fuel condition
- Air filter restriction (E040) -- dust accumulation on extended jobsite use