2004-2012 Colorado, Canyon, Hummer H3, Isuzu i-series

2004-2007 Colorado/Canyon, H3

Things you need to know

If you plan to install a 24x LS engine (1997-early 2007)

1. The Blue (J1) ECM connector on the Colorado computer is a part of the body wiring and remains in the truck after the engine harness has been removed. The E40 V8 computer uses the same style connector, but pinned out differently. The new harness will come with a new J1 connector but the installer will need to remove the wires from the stock Colorado connector and install them in the new connector as well as splice some wires to the new harness. Instructions will be provided with the harness and we hope to have a video showing what exactly needs to be done soon.
2. We will suggest keeping or converting the engine to electronic throttle.
3. We will suggest using an E40 ECU (P/N 12596679), and with Automatic transmissions, a compatible TCM. We can supply the TCM if needed, but not the ECU since they are discontinued and only found used now.
4. While we can setup initial programming for the 24x swaps using the E40 ECU, non-LS2 engine parts, like throttle body or MAF, may require additional tuning for the E40 LS2 ECU to work properly with the specific parts being used in the swap. We strongly suggest finding a local tuner that can alter the tuning on the vehicle to dial in the program to your specific components.
5. The starter operation will need to be addressed with the V8 swap. Either a starter button will be needed, or our optional modified ignition switch can be used.
6. We will suggest installing LS2 knock sensors on the engine if it does not already have them.
7. We will suggest changing the accelerator pedal to a Trailblazer pedal p/n 15145758. (We can supply pedal and bracket)
8. For the Colorado/Canyon harnesses, we will not need any wiring shipped to us, a new harness is custom made with 100% new materials.
9. With the Hummer, we will need the harness from the H3 sent to us to re-use some components.
10. Cruise control will be integrated in to the harness and should work with your stock truck’s cruise control stalk.
11. Electric fan relays and wiring are pre-installed in our harness.
12. Many of these swaps require the use of a “Generator Battery Control Module” which is a small plastic box attached to the negative battery cable on many ’06-up trucks and SUV’s. We have found that the alternator will usually charge properly without this module, but the instrument cluster in the truck will display the battery light if this module is not present. GM P/N 25826405 (or equivalent)

If you plan to install a 58x LS engine (2006-2014)

1. At this time we do not have a plug and play solution to install a 58x engine in to a 2004-2007 Colorado, Canyon, or H3.
2. There is a blue connector that plugs in to your stock Colorado/Canyon ECU (J1) on the firewall that is a part of the body wiring. This section of the harness comes through the firewall and connects the ECU to the interior wiring and modules inside the truck’s cabin. This connector does not come out with the engine harness. This connector is different from the E67 ECU used on the 58x engines and would require the entire connector be cut off and spliced into the new one, or the terminals cut off and re-terminated to work in the E67 computer connectors.
3. Our only offering at this time for putting a 58x engine in to a 2004-2007 truck is an integration harness that keeps the stock computer to run the gauges and truck functions, then an aftermarket system for the engine/trans, like the popular Holley Terminator X kits.

2008-2012 Colorado/Canyon, H3

Things you need to know

If you plan to install a 24x LS engine (1997-early 2007)

1. It is very likely that Stability and traction control systems will not function. Installing a newer (58x) engine will allow all of the electronics to communicate properly and allow proper function of all systems.
2. We will suggest keeping or converting the engine to electronic throttle.
3. We will suggest using an E40 ECU (P/N 12596679), and with Automatic transmissions, a compatible TCM. We can supply the TCM if needed, but not the ECU since they are discontinued and only found used now.
4. While we can setup initial programming for the 24x swaps using the E40 ECU, non-LS2 engine parts, like throttle body or MAF, may require additional tuning for the E40 LS2 ECU to work properly with the specific parts being used in the swap. We strongly suggest finding a local tuner that can alter the tuning on the vehicle to dial in the program to your specific components.
5. The 2009-up I5 trucks have a fuel pump control module that will likely need to be bypassed with a standard on/off relay when switching to the 24x E40 ECU.
6. The starter function will need to be addressed with the 24x V8 swap. Either a starter button will be needed, or our optional modified ignition switch can be used.
7. We will suggest installing LS2 knock sensors on the engine if it does not already have them.
8. We will suggest changing the accelerator pedal to a Trailblazer pedal p/n 15145758. (We can supply pedal and bracket)
9. For the Colorado/Canyon harnesses, we will not need any wiring shipped to us, a new harness is custom made with 100% new materials.
10. With the Hummer, we will need the harness from the H3 sent to us to re-use some components.
11. Cruise control may or may not work depending on the specific application.
12. Electric fan relays and wiring are pre-installed in our harness.
13. Many of these swaps require the use of a “Generator Battery Control Module” which is a small plastic box attached to the negative battery cable on many ’06-up trucks and SUV’s. We have found that the alternator will usually charge properly without this module, but the instrument cluster in the truck will display the battery light if this module is not present. GM P/N 25826405 (or equivalent)

If you plan to install a 58x LS engine (2006-2014)

1. Our suggested engine setup for 08-up trucks for best electronics integration.
2. We will suggest keeping electronic throttle.
3. We will suggest using an E67 ECU that is the proper service number for a 2009-up V8 Colorado, typically 12678512 or 12678513 depending on the year. The 2008-2012 Colorado I4/I5 trucks come with an E67 (12636659) that we have found is not compatible with the V8’s operating system and cannot be reprogrammed to run the V8 engine.
4. Running any transmission that is not native to a 2009-2012 Colorado V8 engine creates additional issues. So a manual transmission or earlier 4L60E/4L80E can require programming and possible parts changes that may result in portions of the swap not operating 100% correctly.
5. The starter function can be relearned in most cases (with automatic transmission) and a modified ignition switch or starter button is not always necessary. The relearn function requires more advanced scan tools, or a dealership to perform the BCM>ECM  relearn procedure which allows the stock ignition switch to work after the swap with the new/reprogrammed ECM.
6. The stock Colorado/Canyon pedal can usually be retained since a 2009-newer Colorado/Canyon operating system can usually be used.
7. For the Colorado/Canyon harnesses, we will not need any wiring shipped to us, a new harness is custom made with 100% new materials.
8. With the Hummer, we will need the harness from the H3 sent to us to re-use some components.
9. Cruise control will be integrated in to the harness and should work with your stock truck’s cruise control stalk.
10. Electric fan relays and wiring are pre-installed in our harness.
11. Many of these swaps require the use of a “Generator Battery Control Module” which is a small plastic box attached to the negative battery cable on many ’06-up trucks and SUV’s. We have found that the alternator will usually charge properly without this module, but the instrument cluster in the truck will display the battery light if this module is not present. GM P/N 25826405 (or equivalent)

There is a blue connector that plugs in to your stock Colorado/Canyon & H3 ECU (C1) on the firewall that is a part of the body wiring. This section of the harness comes through the firewall and connects the ECU to the interior wiring and modules inside the truck’s cabin. This connector does not come out with the engine harness, and will need to be addressed when the new harness is installed. Our custom direct-fit engine harness will include a mating connector to plug in so no splicing or moving wires around will be needed when changing to an E40 ECU. In the 08-up trucks with 58x engine swap applications, the C1 ECM connector would simply plug back in to the E67 ECU and no changes would be needed to it at all.