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How could a circ system lose temp?

Updated: 9/17/2019
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Q: How could a circ system lose temp?
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When you release the pedal, the ECM erases the trouble code(s).Check engine CodesREASON...................................CODEA/T 1ST GR FNCTN....................................0731A/T 2ND GR FNCTN...................................0732A/T 3RD GR FNCTN...................................0733A/T 4TH GR FNCTN...................................0734A/T TCC S/V FNCTN..................................0744APP SEN 1/CIRC +5.................................0227APP SEN 1/CIRC +5.................................0228APP SEN 2/CIRC +5.................................1227APP SENSOR +5.......................................1228ASCD BRAKE SW......................................1572ASCD SW. ................................................1564ASCD VHL SPD SEN..................................1574ATF TEMP SEN/CIRC.................................0710BRAKE SW/CIRCUT...................................1805CAN COMM CIRCUIT ................................1000CAN COMM CIRCUIT.................................1001CKP SEN/CIRCUIT.....................................0335CLOSED LOOP-B1....................................1148CMP SEN/CIRC-B1....................................0340CTP LEARNING.........................................1225CTP LEARNING.........................................1226CYL 1 MISFIRE.........................................0301CYL 2 MISFIRE.........................................0302CYL 3 MISFIRE.........................................0303CYL 4 MISFIRE.........................................0304ECM.........................................................0605ECM BACK UP CIRCUIT............................1065ECT SEN/CIRCUIT.....................................0117ECT SEN/CIRCUIT....................................0118ECT SENSOR............................................0125ENG OVER TEMP.......................................0217ENG OVER TEMP.......................................1217ENGINE SPEED SIG...................................0725ETC ACTR.................................................1121ETC FUNTION CIRC..................................1122ETC MOT..................................................1128ETC MOT PWR...........................................1124ETC MOT PWR...........................................1126EVAP GROSS LEAK....................................0455EVAP PURG FLOW/MON............................0441EVAP SMALL LEAK....................................0442EVAP SYS PRES SEN.................................0452EVAP SYS PRES SEN.................................0453EVAP VERY SML LEAK...............................0456EVAP VERY SML LEAK...............................1456FTT SEN/CIRCUIT.....................................0182FTT SEN/CIRCUIT.....................................0183FTT SENSOR.............................................0181FUEL LEVEL SEN SLOSH...........................0460FUEL LEVEL SEN/CIRC.............................1464FUEL LEVEL SENSOR................................0461FEUL LEVEL SEN/CIRC.............................0462FUEL LEVEL SEN/CIRC.............................0463FUEL SYS-LEAN-B1...................................0171FUEL SYS-RICH-B1...................................0172H02S1(B1)...............................................0132H02S1(B1)...............................................0133H02S1(B1)...............................................0134H02S1(B1)...............................................1143H02S1(B1)...............................................1144H02S1 HTR (B1).......................................0031H02S1 HTR (B1).......................................0032H02S2(B1)...............................................0138H02S2(B1)...............................................0139H02S2(B1)...............................................1146H02S2(B1)...............................................1147H02S2 HTR (B1).......................................0037H02S2 HTR (B1).......................................0038IAT SEN/CIRCUIT.....................................0112IAT SEN/CIRCUIT.....................................0113IAT SENSOR.............................................0127INT/V TIM CONT-B1..................................0011INT/V TIM CONT-B1..................................1111ISC SYSTEM.............................................0506ISC SYSTEM.............................................0507KNOCK SEN/CIRC-B1...............................0327KNOCK SEN/CIRC-B1...............................0328L/PRESS SOL/CIRC..................................0745MAF SEN/CIRCUIT....................................0101MAF SEN/CIRCUIT....................................0102MAF SEN/CIRCUIT....................................0103MAF SENSOR...........................................1102MIL/CIRC.................................................0650MULTI CYL MISFIRE..................................0300NO DTC DETECTED/FURTHER TEST..........FLASHINGNO DTC (NO TROUBLE CODE)..................0000O/R CLUTCH SOL/CIRC............................1760P-N POS SW/CIRCUIT...............................1706PNP SW/CIRC..........................................0705PURG VOLUME CONT/V............................0444PURG VOLUME CONT/V.............................0445PURG VOLUME CONT/V.............................1444SENSOR POWER/CIRC..............................1229SFT SOL A/CIRC........................................0750SFT SOL B/CIRC........................................0755TCC SOLENOID/CIRC................................0740THERMSTAT FNCTN...................................0128TP SEN 1/CIRC.........................................0222TP SEN 1/CIRC..........................................0223TP SEN 2/CIRC.........................................1223TP SEN 2/CIRC.........................................1224TP SENSOR...............................................0221TPV SEN/CIRC A/T....................................1705TW CATALYST SYS-B1...............................0420VC CUT/V BYPASS/V .................................1491VC/V BYPASS/V.........................................1490VEH SPD SEN/CIR AT................................0720VEH SPEED SEN/CIRC..............................0500VENT CONTROL VALVE..............................0447VENT CONTROL VALVE..............................1446VENT CONTROL VALVE..............................1448