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.
DTC U0300: PGM-FI System and A/T System Program Version Mismatch: General Description
An internal version check of the communication data set is done during communication between the FI CPU and the A/T CPU. When the FI CPU or the A/T CPU is rewritten at the powertrain control module (PCM), and the internal communication data version that is rewritten does not match, a malfunction is detected and a DTC is stored.
NO RELATED
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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.