Download SYMPTOM/CONDITION Some customers may experience MIL illumination with no other symptoms noted. Upon investigation the technician may find DTC P1004 – Short Runner Valve Performance as an active (MIL on) or stored (MIL off) fault. The fault may be intermittent, difficult to duplicate and may be more prevalent on low mileage vehicles. DIAGNOSIS Using a Scan Tool (StarSCAN®) with the appropriate Diagnostic Procedures available in TechCONNECT, verify all engine/transmission systems are functioning as designed. If DTC’s other than those listed above are present record them on the repair order and repair as necessary before proceeding further with this bulletin. If the above DTC is found perform the Repair Procedure. After the repair, perform the verification procedures listed at the end of this bulletin.