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Caterpillar 354-0048 is the engine wiring harness in yellow braided sleeving, with the large ECM connector and the branch plugs for the engine sensors and injectors. It is used on Caterpillar C11 and C13 engines. This aftermarket version has the same mounting and electrical connector as the original, so it plugs in and bolts on where the old one came off.
The same part is also sold as Caterpillar 385-2664.
Sold as one unit. Check the number on your old part, or in the parts manual for your machine, before ordering.
| Part Type | Engine Wiring Harness |
| Replaces | Caterpillar 354-0048 |
| Type | Engine wiring harness |
| Engine | Caterpillar C11, C13 |
| Machine | Caterpillar 345C, 345D, 349D, 725, 730, 966H, 972H, 14M |
| Cross references | Caterpillar 385-2664 |
| Fits | Caterpillar 345C, 345D and 349D excavators, 725 and 730 articulated trucks, 966H and 972H loaders and 14M motor graders with the C11 or C13 engine |
| Condition | New, aftermarket |
| Stat. HS-Code | 854430 |
| Country of Manufacture | China |
Caterpillar machines
Check the part number on your old unit before ordering.
| Caterpillar Part No.(SPM Part No.) | Fits |
|---|---|
| 354-0048(SPM-HEP-5259) | Caterpillar 345C, 345D and 349D excavators, 725 and 730 articulated trucks, 966H and 972H loaders and 14M motor graders with the C11 or C13 engine |
| 385-2664(SPM-HEP-5259) | Caterpillar 345C, 345D and 349D excavators, 725 and 730 articulated trucks, 966H and 972H loaders and 14M motor graders with the C11 or C13 engine |
Intermittent faults and warning codes
Chafed, crushed or corroded wires in an engine or main harness give faults that come and go: sensor codes, a rough running engine or a machine that will not start. When several sensors fault at once, look at the harness.
Heat and rodent damage
Harnesses next to the exhaust and turbo go brittle and crack, and rodents chew the insulation on machines that stand. A new harness is quicker than repairing many wires.
Burnt or corroded plugs
Green corrosion or melted pins in the plugs cause high resistance and false readings. Replacing the harness renews every plug at once.
Fitting tips
Disconnect the batteries first, photograph or label every plug before removing the old harness, route the new one along the same clips and away from hot and moving parts, then clear the fault codes and test.
We check what other aftermarket sellers charge for this same part. Their prices on the date we checked:
| Seller | Price | Checked |
|---|---|---|
| eBay, aftermarket seller | USD 198.02 | 3 Nov 2026 |
| Fab Heavy Parts | USD 677.44 | 4 Nov 2026 |
| Buy Machinery Parts | USD 726.90 | 4 Nov 2026 |
| YEMPARTS | USD 735.32 | 3 Nov 2026 |
| YEM Parts | USD 735.32 | 4 Nov 2026 |
| MyMROmarts | USD 787.19 | 4 Nov 2026 |
| Spare Part Mart | USD 103.99 | Today |
Our price of USD 103.99 is 47% to 87% less than these sellers.
Found this part cheaper somewhere else? Send us the listing and we will beat it by 5% under our Price Beat Guarantee. Every order is also covered by our 30 day money back guarantee.
Yes, it was made for the Caterpillar 345C, and 7 more listed under compatible equipment. Check the old wiring harness is marked 354-0048 or one of the cross references, because makers change parts between serial ranges.
On the Caterpillar 345C, there is no fixed interval. It is changed when it fails, and many fail from water in the plug or chafed wiring rather than wear.
A fault code for this circuit, readings that jump or stay fixed, or a part that does not respond with power at the plug.
A little dielectric grease keeps water out of the plug on machines that work outside. Make sure the terminals are clean and tight first.
Usually. Clear them after fitting and run the machine, so old codes are not mistaken for a new fault.
No. It is an aftermarket wiring harness made to replace the Caterpillar 354-0048. It is not made by the original manufacturer; the number only shows what it replaces.
Live rates for the quantity selected, delivered to your door. Confirmed at checkout.
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