MACK trucks are known for their reliability and durability, but even the best vehicles can have problems from time to time. When a MACK truck encounters a problem, the on-board diagnostic system generates a fault code to indicate the problem. These codes can range from minor sensor malfunctions to serious engine problems.
Understanding MACK fault codes is essential for any truck owner or mechanic. With a thorough understanding of these codes, you’ll be able to diagnose and fix problems quickly and effectively. That’s where our guide comes in.
Our guide to understanding MACK fault codes will take you through everything you need to know. We’ll explain the different types of fault codes and what they mean, as well as how to diagnose and fix the underlying problems. With our guide, you’ll be able to identify the source of any problem and take the necessary steps to resolve it.
Our guide has been written by experienced mechanics and engineers who know MACK trucks inside out. We’ve included detailed explanations and diagrams to help you navigate the diagnostic process with ease. Whether you’re an experienced mechanic or a new truck owner, our guide is a valuable resource for anyone working with MACK trucks.
Don’t let MACK fault codes leave you frustrated and confused. Get a full understanding of these codes and how to diagnose and fix the underlying problems with our guide. Order now and take the first step towards becoming a MACK diagnostic expert.
| Emissions Fault Code | Component/Function | “FMI Codes” |
| MID 128 PID 81 | Particulate Trap Differential Pressure | 0, 2, 3, 5, 12 |
| MID 128 PID 94 | Fuel Pressure | 1, 3, 5, 7 |
| MID 128 PID 102 | Boost Pressure | 0, 2, 3, 5, 11 |
| MID 128 PID 103 | Turbo Speed | 0, 1, 9 |
| MID 128 PID 105 | Boost Temperature | 2, 4, 5, 10 |
| MID 128 PID 108 | Ambient Pressure | 2, 3, 4 |
| MID 128 PID 110 | Coolant Temperature | 0, 2, 4, 5, 10 |
| MID 128 PID 153 | Crankcase Pressure | 0, 1, 2, 3, 5 |
| MID 128 PID 171 | Ambient Air Temperature | 9 |
| MID 128 PID 173 | Exhaust Gas Temperature Sensor #1 | 0, 2, 4, 5, 10 |
| MID 128 PID 354 | Relative Air Humidity | 3, 5 |
| MID 128 PID 404 | Compressor Discharge Temperature | 0 |
| MID 128 PID 411 | EGR Differential Pressure | 2, 3, 5 |
| MID 128 PID 412 | EGR Temperature After Cooler | 0, 4, 5, 10 |
| MID 128 PPID 35 | EGR Mass Flow | 0, 1 |
| MID 128 PPID 89 | VGT SRA Temperature | 0 |
| MID 128 PPID 122 | Vehicle Compression Brake (VCB) | 1, 3, 4, 5 |
| MID 128 PPID 272 | Air Temperature For Humidity Compensation | 4, 5 |
| MID 128 PPID 326 | Soot Level | 0, 11, 14 |
| MID 128 PPID 328 | After Treatment Injection Shut-off Valve | 3, 4, 5, 7, 14 |
| MID 128 PPID 329 | After Treatment Fuel Injector | 3, 4, 5, 7, 14 |
| MID 128 PPID 387 | Exhaust Gas Temperature Sensor #2 | 2, 4, 5, 10 |
| MID 128 PPID 436 | Exhaust Gas Temperature Sensor #3 | 0, 2, 4, 5, 10 |
| MID 128 PPID 437 | After Treatment Injector Fuel Pressure | 3, 4, 5, 7, 14 |
| MID 128 PSID 98 | Boost Air System | 0, 1 |
| MID 128 PSID 10 | 9 Coolant Temperature | 7, 12 |
| MID 128 SID 1 | Injector #1 | 3, 5, 7, 12, 14 |
| MID 128 SID 2 | Injector #2 | 3, 5, 7, 12, 14 |
| MID 128 SID 3 | Injector #3 | 3, 5, 7, 12, 14 |
| MID 128 SID 4 | Injector #4 | 3, 5, 7, 12, 14 |
| MID 128 SID 5 | Injector #5 | 3, 5, 7, 12, 14 |
| MID 128 SID 6 | Injector #6 | 3, 5, 7, 12, 14 |
| MID 128 SID 21 | Camshaft Speed Sensor | 2, 3, 8 |
| MID 128 SID 22 | Crankshaft Speed Sensor | 2, 3, 8 |
| MID 128 SID 27 | Variable Geometry Turbocharger Actuator #1 | 2, 4, 7, 9, 13 |
| MID 128 SID 33 | Cooling Fan Control | 3, 4, 5 |
| MID 128 SID 146 | EGR Valve | 1 3, 5, 7, 12 |
| MID 128 SID 211 | 5V Supply | 2 3, 4 |
| MID 128 SID 230 | Buffered IVS | 3, 5 |
| MID 128 SID 232 | 5V Supply 1 | 3, 4 |
| MID 144 PID 72 | Output Supply #1 | 3, 4 |
| MID 144 PID 73 | Output Supply #2 | 3, 4 |
| MID 144 PID 84 (with Tachometer) | Road Speed | 2 |
| MID 144 PID 84 | Road Speed | 2 |
| MID 144 PID 91 | Percent Accelerator Pedal Position | 3, 4, 5, 6, 14 |
| MID 144 PPID 61 | Engine Retarder Switch | 7 |
| MID 144 PPID 69 | Buffered Idle Validation Switch #1 output | 3, 4 |
| MID 144 PPID 70 | Output Supply #3 | 4 |
| MID 144 PPID 71 | Output Supply #4 | 4 |
| MID 144 PPID 265 | Vehicle Speed Sensor supply | 3, 4 |
| MID 144 PSID 2 | Idle Validation Switch #2 | 7 |
| MID 144 SID 230 | Idle Validation Switch #1 | 7 |
