MaxxForce Fault Codes
MaxxForce was Navistar International's in-house diesel engine line, used in International medium and heavy-duty trucks from 2007-2015. The DT (formerly DT466) was a long-running medium-duty workhorse, but the larger MaxxForce 11 and 13 used an EGR-only emissions strategy that failed to meet EPA 2010 NOx targets and triggered massive warranty costs and recalls. The platform was effectively retired in 2015. Many MaxxForce 11/13 trucks have been repowered with Cummins ISX engines.
83 fault codes documented· 5 engine variants · P-codes + International proprietary DTCs · 2007 - 2015
Most Common MaxxForce Fault Codes
Showing 24 of 83 MaxxForce codes, sorted by severity. Each links to causes, diagnostics, common fixes, and repair cost estimates.
MAXXFORCE-P0087-11 critical
Fuel Rail Pressure Too Low
MAXXFORCE-P0087-13 critical
Fuel Rail Pressure Too Low
MAXXFORCE-P0087-7 critical
Fuel Rail Pressure Too Low
MAXXFORCE-P0087-DT critical
Fuel Rail Pressure Too Low
MAXXFORCE-P0088-11 critical
Fuel Rail Pressure Too High
MAXXFORCE-P0088-13 critical
Fuel Rail Pressure Too High
MAXXFORCE-P0088-DT critical
Fuel Rail Pressure Too High
MAXXFORCE-P0193 critical
Fuel Rail Pressure Sensor High
MAXXFORCE-P0217-11 critical
Engine Coolant Over Temperature (Head Bolt Stretch)
MAXXFORCE-P0217-13 critical
Engine Coolant Over Temp (Head Bolt Issue)
MAXXFORCE-P2457-11 critical
EGR Cooling System Efficiency (Catastrophic Failure Mode)
MAXXFORCE-P2457-13 critical
EGR Cooling System (Catastrophic Failure)
MAXXFORCE-P0201-13 serious
Injector Circuit Cylinder 1
MAXXFORCE-P0201-DT serious
Injector Circuit Cylinder 1
MAXXFORCE-P0202 serious
Injector Circuit Cylinder 2
MAXXFORCE-P0203 serious
Injector Circuit Cylinder 3
MAXXFORCE-P0204 serious
Injector Circuit Cylinder 4
MAXXFORCE-P0205 serious
Injector Circuit Cylinder 5
MAXXFORCE-P0206 serious
Injector Circuit Cylinder 6
MAXXFORCE-P020E serious
Cylinder 8 Injector
MAXXFORCE-P0237-11 serious
Turbo Boost Sensor Low
MAXXFORCE-P0237-13 serious
MAP / Boost Sensor Low
MAXXFORCE-P0238 serious
MAP / Boost Sensor High
MAXXFORCE-P0299-11 serious
Turbo Underboost
MaxxForce Engine Versions
| Engine | Years | Applications | Notes |
|---|---|---|---|
| MaxxForce DT | 2007-2015 | International 4300/4400 DuraStar, 7300/7400/7500 WorkStar, IC Bus CE/RE-Series | 7.6L medium-duty (formerly DT466 / DT570 / DT530). Long-running platform; widely used in school buses and vocational trucks. |
| MaxxForce 7 | 2007-2015 | International TerraStar, MV607, school buses | 6.4L V8. Was Ford 6.4L Power Stroke architecture; known for extreme EGR cooler / head bolt failure rate. |
| MaxxForce 11 | 2008-2014 | International ProStar, TranStar 8600, PayStar 5900, WorkStar 7600 | 10.5L I6 EPA10. Dual SCR-less / EGR-only emissions strategy that did not meet 2010 NOx targets -- led to major recalls and an effective shutdown of the platform. |
| MaxxForce 13 | 2008-2014 | International ProStar+ | 12.4L I6 EPA10. Same EGR-only emissions strategy as MaxxForce 11. Notorious for warranty claim costs that pushed Navistar into financial trouble. |
| MaxxForce 15 | 2010-2012 | International ProStar+ (limited) | 15.2L I6, very short-lived. Was supposed to be a Cummins ISX competitor; production stopped quickly amid Navistar emissions strategy collapse. |
Common MaxxForce Issues
- EGR cooler cracking and coolant loss (universal across MaxxForce 7, 11, 13)
- High-pressure fuel pump failures and rail pressure faults on DT and MaxxForce 7
- Head bolt stretching / head gasket failure on MaxxForce 7 (Ford 6.4L architecture)
- NOx sensor faults from the EGR-only emissions strategy on MaxxForce 11 / 13
- Twin thermostat failures causing cold-running codes (P0128) on MaxxForce 11
- VGT actuator sticking and turbo position sensor failures
- Many fleet owners repowered MaxxForce 11/13 trucks with Cummins ISX or retired them early due to warranty cost