What are the guidelines and requirements for reprogramming the Engine Control Module on 2003 Toyota Tacoma?

Starting in 2001, Toyota/Scion and Lexus vehicles feature flash reprogrammable Powertrain Control Modules (PCM). Reprogramming should follow Technical Service Bulletins. Use validated tools like the Toyota/Lexus scantool or J2534 interfaces. The process requires specific software and equipment, and must be uninterrupted to avoid damaging the vehicle controller.

OEM 2003 Toyota Tacoma Engine Control Module

Engine Control Computer

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8 Engine Control Modules found

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2003 Toyota Tacoma ECM
Part Number: 89661-04851
$1178.06 MSRP: $1726.47
You Save: $548.41 (32%)
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Product Specifications
- Other Name: Computer, Engine Control; Engine Control Module
- Replaces: 89661-04850
- Item Weight: 2.20 Pounds
- Item Dimensions: 12.7 x 10.0 x 4.0 inches
- Condition: New
- SKU: 89661-04851
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
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Fits the following 2003 Toyota Tacoma Submodels:
- Base, Pre Runner | 4 Cyl 2.4 L GAS, 4 Cyl 2.7 L GAS
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2003 Toyota Tacoma ECM
Part Number: 89661-04890
$1333.83 MSRP: $1954.75
You Save: $620.92 (32%)
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Product Specifications
- Other Name: Computer, Engine Control; Engine Control Module
- Part Name Code: 89661
- Item Weight: 1.40 Pounds
- Item Dimensions: 9.8 x 7.5 x 3.4 inches
- Condition: New
- Fitment Type: Direct Replacement
- SKU: 89661-04890
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
More Info
Fits the following 2003 Toyota Tacoma Submodels:
- Base, Pre Runner, S-Runner | 6 Cyl 3.4 L GAS
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2003 Toyota Tacoma Ignition Module
Part Number: 89661-0Y021
$1024.78 MSRP: $1501.83
You Save: $477.05 (32%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Computer, Engine Control; Engine Control Module; Ignition Control Module; ECM
- Replaces: 89661-0Y020
- Part Name Code: 89661
- Item Weight: 1.40 Pounds
- Item Dimensions: 10.2 x 7.7 x 3.3 inches
- Condition: New
- Fitment Type: Direct Replacement
- SKU: 89661-0Y021
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
More Info
Fits the following 2003 Toyota Tacoma Submodels:
- Base, Pre Runner | 4 Cyl 2.4 L GAS, 4 Cyl 2.7 L GAS, 6 Cyl 3.4 L GAS
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2003 Toyota Tacoma ECM
Part Number: 89661-04881
Product Specifications
- Other Name: Computer, Engine Control; Engine Control Module
- Replaces: 89661-04880
- Item Weight: 2.20 Pounds
- Item Dimensions: 13.0 x 9.9 x 4.0 inches
- Condition: New
- SKU: 89661-04881
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
More Info
Fits the following 2003 Toyota Tacoma Submodels:
- Base, Pre Runner | 4 Cyl 2.7 L GAS
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2003 Toyota Tacoma ECM
Part Number: 89661-04871
Product Specifications
- Other Name: Computer, Engine Control; Engine Control Module
- Replaces: 89661-04870
- Item Weight: 2.20 Pounds
- Item Dimensions: 13.1 x 9.8 x 4.0 inches
- Condition: New
- SKU: 89661-04871
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
More Info
Fits the following 2003 Toyota Tacoma Submodels:
- Base, Pre Runner | 4 Cyl 2.4 L GAS, 4 Cyl 2.7 L GAS
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2003 Toyota Tacoma ECM
Part Number: 89666-04031-84
Product Specifications
- Other Name: Reman Ecu; Engine Control Module
- Replaces: 89666-04030, 89666-04030-84
- Item Weight: 2.20 Pounds
- Item Dimensions: 13.0 x 10.3 x 4.1 inches
- Condition: New
- SKU: 89666-04031-84
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
More Info
Fits the following 2003 Toyota Tacoma Submodels:
- Base, Pre Runner, S-Runner | 6 Cyl 3.4 L GAS
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2003 Toyota Tacoma ECM
Part Number: 89666-04021-84
Product Specifications
- Other Name: Reman Ecu; Engine Control Module
- Replaces: 89666-04020-84, 89666-04020
- Item Weight: 2.20 Pounds
- Item Dimensions: 13.0 x 10.1 x 4.1 inches
- Condition: New
- SKU: 89666-04021-84
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
More Info
Fits the following 2003 Toyota Tacoma Submodels:
- Base | 6 Cyl 3.4 L GAS
View related parts
2003 Toyota Tacoma ECM
Part Number: 89666-04010-84
Product Specifications
- Other Name: Computer, Engine Control; Engine Control Module
- Replaces: 89666-04010
- Item Weight: 3.20 Pounds
- Item Dimensions: 13.3 x 11.6 x 2.1 inches
- Condition: New
- SKU: 89666-04010-84
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
More Info
Fits the following 2003 Toyota Tacoma Submodels:
- Base | 6 Cyl 3.4 L GAS

2003 Toyota Tacoma Engine Control Module

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2003 Toyota Tacoma Engine Control Module Parts Q&A

Q: What are the guidelines and requirements for reprogramming the Engine Control Module on 2003 Toyota Tacoma?
A: Starting in 2001, Toyota/Scion and Lexus vehicles feature flash reprogrammable Powertrain Control Modules (PCM). Reprogramming should follow Technical Service Bulletins. Use validated tools like the Toyota/Lexus scantool or J2534 interfaces. The process requires specific software and equipment, and must be uninterrupted to avoid damaging the vehicle controller.

Related 2003 Toyota Tacoma Parts

Alternate Year Models

2002 Toyota Tacoma Engine Control Module 2004 Toyota Tacoma Engine Control Module