How does a mechanic diagnose the P0627 code? In many cases, the Check Engine lamp is not illuminated, and the stored code is shown as “pending” in the PCM. The only symptoms that are commonly observed are the stored P0627 code, and the illumination of the Check Engine lamp. Poor electrical connection in the fuel pump circuit.Electrical components in the CAN Bus harness, like wiring or connectors, that are corroded, open, or short.There are only a few possible causes for the P0627 code to be stored. There is not a particular circuit that is designated by this code the “A” refers to an area of malfunction – in this case, the fuel pump control circuit in general. If the PCM has stored this code, it means that when the ignition switch is turned on, the ECM attempted to run the in-tank fuel pump or the fuel pump relay, but a malfunction occurred. This malfunction may have been detected by the PCM, or any of the supporting control modules, particularly the ECM. The P0627 code is stored where there is a malfunction detected within the fuel pump A control circuit.
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