Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
GPEC Controller Identification
The vehicles below may be equipped with a GPEC-2A or GPEC-5 PCM controller. It will be necessary to identify which PCM the vehicle is equipped with prior to performing any diagnostics. Below are some of the methods available to correctly identify the PCM.
Vehicles affected:
- 2021 JT 3.6L
- 2022 JL 3.6L
- 2022 DT 5.7L
Identification options:
- Service Library (Vehicle Dashboard):
- Using the sales code list on the vehicle dashboard, look for sales code NZE. This sales code was created to identify the use of a GPEC-5 controller. If this sales code is not present, the vehicle is equipped with a GPEC-2A controller.
- WiTech:
- ECU Details Tab
- Vehicle Scan Report
- Configuration Report
- PCM Design:
- PCM Connectors
- Comparing the connectors on the vehicles PCM to the information below will assist in identifying the correct controller.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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