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.