Case IH fault codes & repair guides

All 9,847 codes· 50 per page · page 75 of 197

Case IH fault codes with controller, issue summary and a link to the full repair manual
Code	Controller	Issue summary	Repair manual
3960	Engine Control Unit (ECU) / Engine Controller	Intake Throttle Valve Position is lower than expected.	Full repair manual for code 3960, Engine Control Unit (ECU) / Engine Controller
3960	Engine ECU (ISM-DI)	ISM-DI Injector 2 And/Or 3 - Shorted To Low Source	Full repair manual for code 3960, Engine ECU (ISM-DI)
3961 (DTC ED2D) - ECU	Engine Control Module (ECM / ECU) / Electronic Diesel Control (EDC)	CAN communication failure - External torque/speed checksum and counter	Full repair manual for code 3961 (DTC ED2D) - ECU, Engine Control Module (ECM / ECU) / Electronic Diesel Control (EDC)
3961	Engine Control Unit (ECU)	External torque / speed access via CAN BUS: checksum and counter error of request	Full repair manual for code 3961, Engine Control Unit (ECU)
3961	ENGINE ECU	Injector 2 And 3 - Open Circuit	Full repair manual for code 3961, ENGINE ECU
3962 (DTC 49C3)	Engine Control Unit (ECU) / Engine Management System	Crankcase pressure too high for too long	Full repair manual for code 3962 (DTC 49C3), Engine Control Unit (ECU) / Engine Management System
3962	Engine ECU (Engine Control Unit)	Crankcase pressure too high for too long	Full repair manual for code 3962, Engine ECU (Engine Control Unit)
3962	Engine ECU (ISM-DI ENGINE module)	Supply Pump Control Valve (Suction Control Valve) Stuck	Full repair manual for code 3962, Engine ECU (ISM-DI ENGINE module)
3963	Engine Control Unit (ECU)	Crankcase pressure too high and oil pressure too low - Fuel in oil suspected	Full repair manual for code 3963, Engine Control Unit (ECU)
3963	Engine ECU	ISM-DI Actual Rail Pressure Above Target	Full repair manual for code 3963, Engine ECU
3964 (DTC 125D) - ECU	Engine Control Unit (ECU)	ECU temperature sensor 2 is too high	Full repair manual for code 3964 (DTC 125D) - ECU, Engine Control Unit (ECU)
3964	ENGINE (ISM-DI)	Actual Rail Pressure Is Excessive	Full repair manual for code 3964, ENGINE (ISM-DI)
3965 (DTC 245D) - ECU	Engine Control Unit (ECU / EDC)	ECU temperature sensor 2 is too low	Full repair manual for code 3965 (DTC 245D) - ECU, Engine Control Unit (ECU / EDC)
3965	Engine Control Unit (ECU) / Electronic Diesel Control (EDC)	ECU temperature sensor 2 is too low	Full repair manual for code 3965, Engine Control Unit (ECU) / Electronic Diesel Control (EDC)
3965	Engine ECU (ISM-DI / Perkins ISM-DI DOC)	Engine Stop Switch Stuck Closed	Full repair manual for code 3965, Engine ECU (ISM-DI / Perkins ISM-DI DOC)
3966	Engine Control Unit (ECU)	ECU temperature sensor voltage is higher than expected	Full repair manual for code 3966, Engine Control Unit (ECU)
3966	Engine Control Unit (ECU)	Water In Fuel Filter Failure	Full repair manual for code 3966, Engine Control Unit (ECU)
3967 (DTC 275D) - ECU	Engine Control Unit (ECU)	ECU temperature sensor voltage is lower than expected.	Full repair manual for code 3967 (DTC 275D) - ECU, Engine Control Unit (ECU)
3967	Engine ECU (Engine Controller)	ISM-DI Injector Codes Not Written To ECU	Full repair manual for code 3967, Engine ECU (Engine Controller)
3968	Engine Control Unit (ECU) / Engine Control Module (ECM)	Post Drive Relay, Open circuit on the Low Side	Full repair manual for code 3968, Engine Control Unit (ECU) / Engine Control Module (ECM)
3968	Engine ECU	After run relay high side driver circuit open failure	Full repair manual for code 3968, Engine ECU
3968	Engine ECU (ISM-DI)	Incorrect Injector Codes	Full repair manual for code 3968, Engine ECU (ISM-DI)
3969	Engine Control Unit (ECU)	Invalid Injector Codes	Full repair manual for code 3969, Engine Control Unit (ECU)
3969	Engine Control Unit (ECU)	Invalid Injector Codes / Quick Response definition error	Full repair manual for code 3969, Engine Control Unit (ECU)
3969	Engine ECU	After run relay high side ECU driver circuit over temperature failure.	Full repair manual for code 3969, Engine ECU
3970	Engine Control Module (ECM) / EDC (Electronic Diesel Control)	After run relay high side driver circuit short to battery failure	Full repair manual for code 3970, Engine Control Module (ECM) / EDC (Electronic Diesel Control)
3970	Engine ECU (ISM-DI)	ECU Memory Fault / Main CPU fault	Full repair manual for code 3970, Engine ECU (ISM-DI)
3971	Engine Control Unit (ECU)	After run relay high side driver circuit short to ground failure	Full repair manual for code 3971, Engine Control Unit (ECU)
3971	Engine ECU	Engine ECU Memory Error - Verify Engine Dataset	Full repair manual for code 3971, Engine ECU
3972	ENGINE	Intake Throttle Motor Driver Circuit Invalid	Full repair manual for code 3972, ENGINE
3972	Engine ECU	After Run Relay / Throttle Motor Circuit Open	Full repair manual for code 3972, Engine ECU
3973	Engine ECU	After run relay low side ECU driver circuit over temperature failure.	Full repair manual for code 3973, Engine ECU
3973	ISM-DI (Engine)	EGR Valve Position Does Not Match The Target Position	Full repair manual for code 3973, ISM-DI (Engine)
3974	Engine Control Module (ECM)	After run relay low side driver circuit short to battery failure	Full repair manual for code 3974, Engine Control Module (ECM)
3974	Engine Control Unit (ECU) / ISM-DI Engine Controller	EGR Motor Signal Shorted To Power Or Ground	Full repair manual for code 3974, Engine Control Unit (ECU) / ISM-DI Engine Controller
3975	Engine Control Unit (ECU)	Intake Throttle Valve Stuck	Full repair manual for code 3975, Engine Control Unit (ECU)
3976	Engine Control Unit (ECU) / ISM-DI ENGINE	Perform Maintenance On EGR Timing 1-1	Full repair manual for code 3976, Engine Control Unit (ECU) / ISM-DI ENGINE
3976-03 - BCM	Body Control Module (BCM)	Short circuit to B+ on the Cab Center Dome Light Auto Driver circuit	Full repair manual for code 3976-03 - BCM, Body Control Module (BCM)
3976-05 - BCM	Body Controller (BCM)	Cab Dome Light - Open Circuit	Full repair manual for code 3976-05 - BCM, Body Controller (BCM)
3976-06 - BCM	BCM	Short circuit to ground in the cab center dome light auto driver circuit	Full repair manual for code 3976-06 - BCM, BCM
3977	Engine ECU (Engine Control Module)	Prefilter fuel pressure sensor voltage is higher than expected.	Full repair manual for code 3977, Engine ECU (Engine Control Module)
3977	Engine ECU (ISM-DI or ISM-IDI)	Perform Maintenance On EGR Timing 1-2	Full repair manual for code 3977, Engine ECU (ISM-DI or ISM-IDI)
3977-00 - BCM	Body Control Module (BCM)	Dome light constant power - too many loads or faulty load	Full repair manual for code 3977-00 - BCM, Body Control Module (BCM)
3977-03 - BCM	Body Control Module (BCM)	Dome light constant power - short circuit to B+	Full repair manual for code 3977-03 - BCM, Body Control Module (BCM)
3977-05 - BCM	Body Control Module (BCM)	Cab Dome Light 2 / Sleeper Dome Light Relay Under Current Or Open Circuit	Full repair manual for code 3977-05 - BCM, Body Control Module (BCM)
3977-06 - BCM	BCM	Cab Dome Light 2 - Current above normal or grounded circuit	Full repair manual for code 3977-06 - BCM, BCM
3978	Engine ECU	ENGINE, Particulate Matter Catalyst (PMCat): Signal range check flow resistance of the particulate filter - High.	Full repair manual for code 3978, Engine ECU
3979	ENGINE ECU	Particulate Matter Catalyst (PMCat) : Signal range check flow resistance of the particulate filter - very high.	Full repair manual for code 3979, ENGINE ECU
3979	Engine ECU (Engine Control Unit)	Plausibility check: Measured fuel pressure upstream gear pump is higher than the possible physical maximum in this operating point.	Full repair manual for code 3979, Engine ECU (Engine Control Unit)
3980	Engine Control Unit (Engine ECU)	Measured fuel pressure upstream gear pump is less than the possible physical minimum	Full repair manual for code 3980, Engine Control Unit (Engine ECU)