December 2023 Service and Repair ManualFord MSG-425 Engine Fault CodesPart No. 1325652GT GS™-3390 • GS™-4390 • GS™-5390 157Code Description1173 Megajector comm lost1174 Megajector voltage supply high1175 Megajector voltage supply low1176 Megajector internal actuator fault detection1177 Megajector internal circuitry fault detection1178 Megajector internal comm fault detection1311 Misfire detected1312 Misfire detected1313 Misfire detected1314 Misfire detected1315 Misfire detected1316 Misfire detected1317 Misfire detected1318 Misfire detected1511 AUX analog PU1 high1512 AUX analog PU1 low1513 AUX analog PU2 high1514 AUX analog PU2 low1515 AUX analog PD1 high1516 AUX analog PD1 low1517 AUX analog PU3 high1518 AUX analog PU3 low1521 CHT higher than expected 11522 CHT higher than expected 21531 IVS/Brake/Trans-Park interlock failure1541 AUX analog PUD1 high1542 AUX analog PUD1 low1543 AUX analog PUD2 high1544 AUX analog PUD2 low1545 AUX analog PUD3 highCode Description1551 AUX DIG1 high1552 AUX DIG1 low1553 AUX DIG2 high1554 AUX DIG2 low1555 AUX DIG3 high1556 AUX DIG3 low1561 AUX analog PD2 high1562 AUX analog PD2 low1563 AUX analog PD3 high1564 AUX analog PD3 low1611 5VE 1/2 simultaneous out of range1612 RTI 1 loss1613 RTI 2 loss1614 RTI 3 loss1615 A/D loss1616 Invalid interrupt1621 Rx Inactive1622 Rx Noise1623 Invalid Packet Format1624 Shutdown Request1625 Shutdown Request1626 CAN Tx failure1627 CAN Rx failure1628 CAN addresss conflict failureFor further engine fault code troubleshooting anddiagnostic information, refer to the Ford MSG-425EFI Diagnostic Manual (EDI part number1080030).Ford MSG-425 EFI Diagnostic ManualGenie part number 162067