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.
Fuel Pressure High
If fuel pressure is too high, air/fuel ratio will be rich. For fuel pressure checking procedure, see BASIC TESTING article. The ECM can compensate for slight increases but if air/fuel ratio becomes too rich a Code 45 will be set.
If fuel pressure is too high, air/fuel ratio will be rich. For fuel pressure checking procedure, see TESTS W/CODES - DIESEL (for Diesel engines) or TESTS W/CODES - V6 (for Gas engines) and the article TESTS W/CODES - TRANSMISSION (if transmission codes are displayed). The ECM can compensate for slight increases but if air/fuel ratio becomes too rich a Code 45 will be set.
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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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