Improved Flash Files are Available {7620}
- Truck Engines:
- 3126B (S/N: 8YL1-UP; 7AS1-UP)
- 3126E (S/N: CKM1-UP; 9SZ1-UP)
Improved flash files have been released for 3126B and 3126E Truck Engines. An upgrade to the new flash files is only required if a failure or a problem has occurred. The new flash files are designed to reduce the following issues in certain applications and ambient conditions:
- Hard starting in moderate temperatures at high altitude
- Hard starting that produces black soot or smoke
- Hard starting at moderate temperatures with high parasitic loads
If one of the above problems has occurred, an upgrade to the new flash files may be required. Upgrading to the new flash files is necessary only if one of the above problems has occurred. The following table provides the new part numbers for the flash files for the various engine ratings. Prior to installing the new flash files, check the Caterpillar Service Information System (SIS) in order to verify that the correct flash files are being installed.
Show/hide table
| Sales Model | Serial Number Range | Engine Rating | Part Number for Flash File | Interlock Code 1 | Interlock Code 2 | |
| Power | Torque | |||||
| 3126B | S/N:7AS1-UP |
130.5 kW (175 hp) |
420 N·m (309.8 lb ft) |
246-8248 | 301 | N/A |
| 3126B | S/N:7AS1-UP |
141.7 kW (190 hp) |
520 N·m (383.5 lb ft) |
246-8247 | 302 | N/A |
| 3126B | S/N:7AS1-UP |
141.7 kW (190 hp) |
520 N·m (383.5 lb ft) |
246-8246 | 302 | N/A |
| 3126B | S/N:7AS1-UP |
156.6 kW (210 hp) |
520 N·m (383.5 lb ft) |
246-8245 | 332 | N/A |
| 3126B | S/N:7AS1-UP |
156.6 kW (210 hp) |
520 N·m (383.5 lb ft) |
246-8244 | 303 | N/A |
| 3126B | S/N:7AS1-UP |
156.6 kW (210 hp) |
605 N·m (446.2 lb ft) |
246-8243 | 304 | N/A |
| 3126B | S/N:7AS1-UP |
156.6 kW (210 hp) |
605 N·m (446.2 lb ft) |
246-8242 | 329 | N/A |
| 3126B | S/N:7AS1-UP |
171.5 kW (230 hp) |
660 N·m (486.8 lb ft) |
246-8241 | 305 | N/A |
| 3126B | S/N:7AS1-UP |
186.4 kW (250 hp) |
660 N·m (486.8 lb ft) |
246-8240 | 306 | N/A |
| 3126B | S/N:7AS1-UP |
186.4 kW (250 hp) |
800 N·m (590.0 lb ft) |
246-8239 | 307 | N/A |
| 3126B | S/N:7AS1-UP |
205.1 kW (275 hp) |
800 N·m (590.0 lb ft) |
246-8238 | 308 | N/A |
| 3126B | S/N:7AS1-UP |
205.1 kW (275 hp) |
860 N·m (634.3 lb ft) |
246-8237 | 309 | N/A |
| 3126B | S/N:7AS1-UP |
223.7 kW (300 hp) |
800 N·m (590.0 lb ft) |
246-8236 | 310 | N/A |
| 3126B | S/N:7AS1-UP |
223.7 kW (300 hp) |
860 N·m (634.3 lb ft) |
246-8235 | 311 | N/A |
| 3126B | S/N:7AS1-UP |
205.1 kW (275 hp) |
800 N·m (590.0 lb ft) |
246-8234 | 312 | N/A |
| 3126B | S/N:7AS1-UP |
205.1 kW (275 hp) |
860 N·m (634.3 lb ft) |
246-8233 | 313 | N/A |
| 3126B | S/N:7AS1-UP |
223.7 kW (300 hp) |
800 N·m (590.0 lb ft) |
246-8232 | 314 | N/A |
| 3126B | S/N:7AS1-UP |
223.7 kW (300 hp) |
860 N·m (634.3 lb ft) |
246-8231 | 315 | N/A |
| 3126B | S/N:7AS1-UP |
246.1 kW (330 hp) |
860 N·m (634.3 lb ft) |
246-8230 | 316 | N/A |
| 3126B | S/N:7AS1-UP |
246.1 kW (330 hp) |
860 N·m (634.3 lb ft) |
246-8229 | 317 | N/A |
| 3126B | S/N:8YL1-34999 |
130.5 kW (175 hp) |
420 N·m (309.8 lb ft) |
246-8273 | 101 | 151 |
| 3126B | S/N:8YL35000-UP |
130.5 kW (175 hp) |
420 N·m (309.8 lb ft) |
246-8272 | 169 | 169 |
| 3126B | S/N:8YL1-34999 |
141.7 kW (190 hp) |
520 N·m (383.5 lb ft) |
246-8271 | 102 | 152 |
| 3126B | S/N:8YL35000-UP |
141.7 kW (190 hp) |
520 N·m (383.5 lb ft) |
246-8270 | 170 | 170 |
| 3126B | S/N:8YL1-34999 |
156.6 kW (210 hp) |
520 N·m (383.5 lb ft) |
246-8269 | 103 | 153 |
| 3126B | (S/N: 8YL35000-UP; 9SZ1-UP) | 156.6 kW (210 hp) |
520 N·m (383.5 lb ft) |
246-8268 | 171 | 171 |
| 3126B | S/N:8YL1-34999 |
156.6 kW (210 hp) |
520 N·m (383.5 lb ft) |
246-8267 | 104 | 154 |
| 3126B | (S/N: 8YL35000-UP; 9SZ1-UP) | 156.6 kW (210 hp) |
520 N·m (383.5 lb ft) |
246-8266 | 172 | 172 |
| 3126B | S/N:8YL1-34999 |
156.6 kW (210 hp) |
605 N·m (446.2 lb ft) |
246-8265 | 105 | 155 |
| 3126B | (S/N: 8YL35000-UP; 9SZ1-UP) | 156.6 kW (210 hp) |
605 N·m (446.2 lb ft) |
246-8264 | 173 | 173 |
| 3126B | (S/N: 8YL1-UP; 9SZ1-UP) | 171.5 kW (230 hp) |
660 N·m (486.8 lb ft) |
246-8263 | 106 | 156 |
| 3126B | S/N:8YL1-68263 |
186.4 kW (250 hp) |
660 N·m (486.8 lb ft) |
246-8262 | 107 | 157 |
| 3126B | (S/N: 8YL68264-UP; 9SZ1-UP) | 186.4 kW (250 hp) |
660 N·m (486.8 lb ft) |
246-8261 | 187 | 187 |
| 3126B | S/N:8YL1-68263 |
186.4 kW (250 hp) |
800 N·m (590.0 lb ft) |
246-8260 | 108 | 158 |
| 3126B | (S/N: 8YL68264-UP; 9SZ1-UP) | 186.4 kW (250 hp) |
800 N·m (590.0 lb ft) |
246-8259 | 188 | 188 |
| 3126B | (S/N: 8YL1-UP; 9SZ1-UP) | 205.1 kW (275 hp) |
800 N·m (590.0 lb ft) |
246-8258 | 109 | 159 |
| 3126B | (S/N: 8YL1-UP; 9SZ1-UP) | 205.1 kW (275 hp) |
860 N·m (634.3 lb ft) |
246-8257 | 110 | 160 |
| 3126B | (S/N: 8YL1-UP; 9SZ1-UP) | 223.7 kW (300 hp) |
800 N·m (590.0 lb ft) |
246-8256 | 111 | 161 |
| 3126B | (S/N: 8YL1-UP; 9SZ1-UP) | 223.7 kW (300 hp) |
860 N·m (634.3 lb ft) |
246-8255 | 112 | 162 |
| 3126B | (S/N: 8YL1-UP; 9SZ1-UP) | 205.1 kW (275 hp) |
800 N·m (590.0 lb ft) |
246-8254 | 113 | 163 |
| 3126B | (S/N: 8YL1-UP; 9SZ1-UP) | 205.1 kW (275 hp) |
860 N·m (634.3 lb ft) |
246-8253 | 114 | 164 |
| 3126B | (S/N: 8YL1-UP; 9SZ1-UP) | 223.7 kW (300 hp) |
800 N·m (590.0 lb ft) |
246-8252 | 115 | 165 |
| 3126B | (S/N: 8YL1-UP; 9SZ1-UP) | 223.7 kW (300 hp) |
860 N·m (634.3 lb ft) |
246-8251 | 116 | 166 |
| 3126B | (S/N: 8YL1-UP; 9SZ1-UP) | 246.1 kW (330 hp) |
860 N·m (634.3 lb ft) |
246-8250 | 117 | 167 |
| 3126B | (S/N: 8YL1-UP; 9SZ1-UP) | 246.1 kW (330 hp) |
860 N·m (634.3 lb ft) |
246-8249 | 118 | 168 |
| 3126E | S/N:CKM1-UP |
130.5 kW (175 hp) |
420 N·m (309.8 lb ft) |
246-8293 | 219 | N/A |
| 3126E | S/N:CKM1-UP |
141.7 kW (190 hp) |
420 N·m (309.8 lb ft) |
246-8292 | 229 | N/A |
| 3126E | S/N:CKM1-UP |
141.7 kW (190 hp) |
520 N·m (383.5 lb ft) |
246-8291 | 227 | N/A |
| 3126E | S/N:CKM1-UP |
156.6 kW (210 hp) |
520 N·m (383.5 lb ft) |
246-8290 | 228 | N/A |
| 3126E | S/N:CKM1-UP |
156.6 kW (210 hp) |
520 N·m (383.5 lb ft) |
246-8289 | 222 | N/A |
| 3126E | S/N:CKM1-UP |
156.6 kW (210 hp) |
605 N·m (446.2 lb ft) |
246-8288 | 223 | N/A |
| 3126E | S/N:CKM1-UP |
171.5 kW (230 hp) |
660 N·m (486.8 lb ft) |
246-8287 | 206 | N/A |
| 3126E | S/N:CKM1-UP |
186.4 kW (250 hp) |
660 N·m (486.8 lb ft) |
246-8286 | 207 | N/A |
| 3126E | S/N:CKM1-10423 |
186.4 kW (250 hp) |
800 N·m (590.0 lb ft) |
246-8285 | 208 | N/A |
| 3126E | S/N:CKM10424-UP |
186.4 kW (250 hp) |
800 N·m (590.0 lb ft) |
246-8284 | 205 | N/A |
| 3126E | S/N:CKM1-UP |
205.1 kW (275 hp) |
800 N·m (590.0 lb ft) |
246-8283 | 209 | N/A |
| 3126E | S/N:CKM1-UP |
205.1 kW (275 hp) |
860 N·m (634.3 lb ft) |
246-8282 | 210 | N/A |
| 3126E | S/N:CKM1-UP |
223.7 kW (300 hp) |
800 N·m (590.0 lb ft) |
246-8281 | 211 | N/A |
| 3126E | S/N:CKM1-UP |
223.7 kW (300 hp) |
860 N·m (634.3 lb ft) |
246-8280 | 212 | N/A |
| 3126E | S/N:CKM1-UP |
205.1 kW (275 hp) |
800 N·m (590.0 lb ft) |
246-8279 | 213 | N/A |
| 3126E | S/N:CKM1-UP |
205.1 kW (275 hp) |
860 N·m (634.3 lb ft) |
246-8278 | 214 | N/A |
| 3126E | S/N:CKM1-UP |
223.7 kW (300 hp) |
800 N·m (590.0 lb ft) |
246-8277 | 215 | N/A |
| 3126E | S/N:CKM1-UP |
223.7 kW (300 hp) |
860 N·m (634.3 lb ft) |
246-8276 | 216 | N/A |
| 3126E | S/N:CKM1-UP |
246.1 kW (330 hp) |
860 N·m (634.3 lb ft) |
246-8275 | 217 | N/A |
| 3126E | S/N:CKM1-UP |
246.1 kW (330 hp) |
860 N·m (634.3 lb ft) |
246-8274 | 218 | N/A |
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