157-3705 ECM Engine Controller for Caterpillar CAT 3406E C-10 C-12 C-15 C-16 Truck Engine
157-3705 ECM controller for Caterpillar 3406E, C-10, C-12, C-15, C-16 truck engines.
- Interchangeability: Part number 157-3705, also written 1573705.
- Application: Fits for Caterpillar 3406E, C-10, C-12, C-15 and C-16 on-highway truck engines.
- Programming Required: After ordering, send your ESN, VIN and photos of the ECM label and engine data plate.
- Check Your ECM Number: These engines used several ECM part numbers — match 157-3705 on your existing unit, not just the engine model.
$1,199.00
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Bench-Tested - Every unit powered up and function-tested before dispatch.
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6-Month Warranty - From delivery, against defects in materials and workmanship.
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30-Day Returns - Unused items in original packaging. RMA required.
Product Details
The 157-3705 Remanufactured ECM Controller is a direct replacement electronic engine control module, fits for Caterpillar 3406E, C-10, C-12, C-15 and C-16 on-highway truck engines.
Each remanufactured module is disassembled, inspected and restored to the published 157-3705 part-number specification. Before dispatch every unit is powered up on the bench and function-tested for power-up, data link communication and input/output response, so it is ready to be programmed to your truck engine and restore factory-specified performance.
- Reference Numbers: 157-3705 (1573705)
- Condition: Remanufactured
- Function: Controls fuel delivery and engine operation to the engine’s factory-specified parameters
- Engine Families: 3406E, C-10, C-12, C-15 and C-16 on-highway truck engines (see Fitment chart)
- Installation: Direct replacement — mounts in the stock location and connects to the existing engine and vehicle harnesses
- Programming: Required before use — see notice below
Programming Required — Information Needed After Purchase: This ECM must be programmed to your specific engine before it will run correctly, as every engine has its own configuration requirements. After placing your order, please send us:
- Engine Serial Number (ESN)
- Vehicle Identification Number (VIN)
- Clear photos of your current ECM / ECU label (part number visible)
- A clear photo of the engine data plate
Installation Notes: Installation and removal of the engine control module should be carried out by an experienced technician. Turn the key off and disconnect the batteries before unplugging the ECM, keep connectors clean and dry, and confirm the engine configuration with a service tool after programming, before the truck returns to the road.
Fitment & OEM Interchange
Brand names and part numbers are used for reference and compatibility identification only. This is an aftermarket remanufactured replacement part.
Part Number Cross-Reference (OEM Interchange)
| Part Number | Written Variant | Compatible Engine Series |
|---|---|---|
| 157-3705 | 1573705 | For Caterpillar 3406E, C-10, C-12, C-15, C-16 Truck Engines |
Application Chart
| Engine Series | Application |
|---|---|
| 3406E — Fits for Caterpillar | On-highway truck engine |
| C-10 — Fits for Caterpillar | On-highway truck engine |
| C-12 — Fits for Caterpillar | On-highway truck engine |
| C-15 — Fits for Caterpillar | On-highway truck engine |
| C-16 — Fits for Caterpillar | On-highway truck engine |
Technical Specifications
| Specification | Detail |
|---|---|
| Part Name | ECM Controller — Electronic Engine Control Unit Module |
| Reference Numbers | 157-3705, 1573705 |
| Condition | Remanufactured |
| Installation Method | Direct replacement, connects to existing engine and vehicle harnesses |
| Programming | Required — ESN, VIN and data plate photos needed after purchase |
| System Voltage | Application dependent, confirm on data plate |
| Housing Material | Application dependent, confirm on data plate |
| Connectors | Matches stock harness connectors for part number 157-3705 |
| Circuit Protection | Application dependent, confirm on data plate |
| Testing | Bench-tested — powered up and function-tested before dispatch |
| Warranty | 6 months from delivery against defects in materials and workmanship |
| Package Contents | 1 × Remanufactured ECM Controller |
This module is intended solely to restore factory-specified performance and operating parameters. It is programmed to the engine’s factory configuration and does not modify emission control functions, engine ratings or engine output.
Common Failure Symptoms
| Symptom | What It Usually Points To |
|---|---|
| Truck cranks but the engine will not start, and the check engine lamp does not come on | ECM not powering up or not commanding the injectors |
| Service tool cannot connect to the engine | Loss of ECM communication on the data link or an internal module fault |
| Engine shuts down while driving and restarts after the key is cycled | Intermittent ECM power supply or an internal controller fault |
| Cruise control, engine brake or idle settings stop responding | ECM no longer reading switch inputs from the cab |
| Speedometer or tachometer drops to zero with the engine running | ECM not processing or sending speed and RPM signals |
| Multiple unrelated sensor codes appear at the same time | Failing sensor supply voltage from the ECM, or a harness short |
| Engine runs rough or misfires on one or more cylinders with good injectors | Injector driver circuit fault inside the ECM |
| Faults appear after jump-starting, welding or a charging system failure | Voltage spike damage to the control module |
Shipping & Quality Guarantee
- Bench-Tested: Every unit is powered up and function-tested before dispatch
- Fast Dispatch: Dispatched in 1–3 business days
- Free Express Shipping: DHL / FedEx / UPS, delivered in 3–8 business days
- Tracking: Tracking number provided within 24–48 hours of dispatch
- Protective Packaging: Anti-static bag and padded carton for safe transit
- 6-Month Warranty: From delivery, against defects in materials and workmanship — repair or replacement provided
- 30-Day Returns: Unused items in as-received packaging, RMA required
- Technical Support: Send your ESN, VIN and data plate photos for fitment and programming confirmation
All brand names, trademarks and part numbers are used for compatibility reference only. LIUCHUANG Parts is an independent aftermarket parts supplier and is not affiliated with or endorsed by any equipment manufacturer.
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