2011 Volvo C70FACTORY OEM SERVICE PROCEDURE

Engine Control Module (ECM) DTCS - B5254T7

ENGINE CONTROL MODULE (ECM) - DTC INDEX

OBD-II Code DTC Description
- ECM-112C Atmospheric pressure sensor. Signal too high
- ECM-112D Atmospheric pressure sensor. Signal too low
- ECM-1130 Atmospheric pressure sensor. Faulty signal
- ECM-113B Atmospheric pressure sensor. Signal missing
- ECM-113C Atmospheric pressure sensor. Signal too high
- ECM-113D Atmospheric pressure sensor. Signal too low
- ECM-120C Mass air flow. Faulty signal
- ECM-120D Mass air flow. Signal missing
- ECM-122C Mass air flow (MAF) sensor. Flow too high
- ECM-122D Mass air flow (MAF) sensor. Flow too low
- ECM-1230 Air mass. Signal too low
- ECM-123B Air mass. Signal too high
- ECM-123C Air mass. Signal too high
- ECM-123D Air mass. Signal too low
- ECM-125C Boost pressure sensor. Signal too high
- ECM-125D Boost pressure sensor. Signal too low
- ECM-1260 Boost pressure sensor. Signal too high
- ECM-126B Boost pressure sensor. Signal too low
- ECM-126C Boost pressure sensor. Signal too high
- ECM-126D Boost pressure sensor. Signal too low
- ECM-131C Intake air temperature (IAT) sensor. Signal too high
- ECM-131D Intake air temperature (IAT) sensor. Signal too low
- ECM-1320 Intake Air Temperature (IAT) Sensor. Faulty signal
- ECM-132C Intake air temperature (IAT) sensor. Signal too high
- ECM-133C Intake air temperature (IAT) sensor inlet. Signal too high
- ECM-133D Intake air temperature (IAT) sensor inlet. Signal too low
- ECM-1410 Outside temperature sensor. Signal missing
- ECM-141B Outside temperature sensor. Signal missing
- ECM-142B Outside temperature sensor. Signal missing
- ECM-142C Outside temperature sensor. Signal too high
- ECM-142D Outside temperature sensor. Signal too low
- ECM-143C Outside temperature sensor. Signal too high
- ECM-143D Outside temperature sensor. Signal too low
- ECM-200B Injector cyl 1. Signal missing
- ECM-200C Injector cyl 1. Signal too high
- ECM-200D Injector cyl 1. Signal too low
- ECM-2140 Long-term fuel trim, bank 1
- ECM-214C Long-term fuel trim, bank 1
- ECM-214D Long-term fuel trim, bank 1
- ECM-21AC Long-term fuel trim load, bank1. Upper limit
- ECM-21AD Long-term fuel trim load, bank1. Lower limit
- ECM-21CC Long-term fuel trim, idling, bank 1. Upper limit
- ECM-21CD Long-term fuel trim, idling, bank 1. Lower limit
- ECM-2200 Rear heated oxygen sensor (HO2S), bank 1, heating. Faulty signal
- ECM-221B Rear heated oxygen sensor (HO2S) ageing, bank 1. Signal missing
- ECM-221C Rear heated oxygen sensor (HO2S) ageing, bank 1. Signal too high
- ECM-221D Rear heated oxygen sensor (HO2S) ageing, bank 1. Signal too low
- ECM-2220 Rear heated oxygen sensor (HO2S), bank 1. Faulty signal
- ECM-222B Rear heated oxygen sensor (HO2S), bank 1. Signal missing
- ECM-222C Rear heated oxygen sensor (HO2S), bank 1. Signal too high
- ECM-222D Rear heated oxygen sensor (HO2S), bank 1. Signal too low
- ECM-223B Rear heated oxygen sensor (HO2S), bank 1. Signal missing
- ECM-223C Rear heated oxygen sensor (HO2S), bank 1. Signal too high
- ECM-223D Rear heated oxygen sensor (HO2S), bank 1. Signal too low
- ECM-2250 Rear heated oxygen sensor (HO2S), bank 1
- ECM-2400 Front heated oxygen sensor (HO2S), bank 1, heating. Faulty signal
- ECM-240B Front heated oxygen sensor (HO2S), bank 1, heating. Signal missing
- ECM-240C Front heated oxygen sensor (HO2S), bank 1, heating. Signal too high
- ECM-242D Front heated oxygen sensor (HO2S), bank 1. Slow regulation
- ECM-243B Front heated oxygen sensor (HO2S), bank 1. Signal missing
- ECM-243C Front heated oxygen sensor (HO2S). Signal too high
- ECM-244B Front heated oxygen sensor (HO2S), bank 1, heating. Signal missing
- ECM-244C Front heated oxygen sensor (HO2S), bank 1, heating. Signal too high
- ECM-244D Front heated oxygen sensor (HO2S), bank 1, heating. Signal too low
- ECM-2450 Front heated oxygen sensor (HO2S), bank 1. Faulty signal
- ECM-245B Front heated oxygen sensor (HO2S), bank 1. Signal missing
- ECM-245C Front heated oxygen sensor (HO2S), bank 1. Signal too high
- ECM-245D Front heated oxygen sensor (HO2S), bank 1. Signal too low
- ECM-246B Front heated oxygen sensor (HO2S), bank 1. Signal missing
- ECM-2470 Front heated oxygen sensor (HO2S), bank 1. Faulty signal
- ECM-247B Front heated oxygen sensor (HO2S), bank 1. Signal missing
- ECM-248C Front heated oxygen sensor (HO2S), bank 1. Signal too high
- ECM-248D Front heated oxygen sensor (HO2S), bank 1. Signal too low
- ECM-249B Front heated oxygen sensor (HO2S), bank 1. Signal missing
- ECM-24AB Front heated oxygen sensor (HO2S), bank 1. Signal missing
- ECM-24C0 Front heated oxygen sensor (HO2S), bank 1. Faulty signal
- ECM-24CB Front heated oxygen sensor (HO2S), bank 1. Signal missing
- ECM-24CC Front heated oxygen sensor (HO2S), bank 1. Signal too high
- ECM-24CD Front heated oxygen sensor (HO2S), bank 1. Signal too low
- ECM-24D0 Front heated oxygen sensor (HO2S), bank 1. Faulty signal
- ECM-24EB Rear heated oxygen sensor (HO2S). Slow regulation
- ECM-24EC Rear heated oxygen sensor (HO2S). Slow regulation
- ECM-270B Engine coolant temperature (ECT) sensor. Signal missing
- ECM-273C Engine coolant temperature (ECT) sensor. Signal too high
- ECM-273D Engine coolant temperature (ECT) sensor. Signal too low
- ECM-2740 Engine coolant temperature (ECT) sensor. Faulty signal
- ECM-274C Engine coolant temperature (ECT) sensor. Signal too high
- ECM-274D Engine coolant temperature (ECT) sensor. Signal too low
- ECM-275C Engine coolant temperature (ECT) sensor. Signal too high
- ECM-275D Engine coolant temperature (ECT) sensor. Signal too low
- ECM-2800 Fuel pressure sensor. Faulty signal
- ECM-280B Fuel pressure sensor. Signal missing
- ECM-280C Fuel pressure sensor. Signal too high
- ECM-280D Fuel pressure sensor. Signal too low
- ECM-281C Text message. Pressure too high
- ECM-2900 Fuel pressure. Faulty signal
- ECM-290B Fuel pressure. Signal missing
- ECM-290C Fuel pressure. Signal too high
- ECM-290D Fuel pressure. Signal too low
- ECM-291B Fuel pump control module. Signal missing
- ECM-291C Fuel pump control module. Signal too high
- ECM-291D Fuel pump control module. Signal too low
- ECM-2A00 Fuel temperature sensor. Faulty signal
- ECM-2A0B Fuel temperature sensor. Signal missing
- ECM-2A0C Fuel temperature sensor. Signal too high
- ECM-2A0D Fuel temperature sensor. Signal too low
- ECM-2A10 Fuel temperature sensor. Signal too high
- ECM-2A1B Fuel temperature sensor. Signal too low
- ECM-2A1C Fuel temperature sensor. Signal too high
- ECM-2A1D Fuel temperature sensor. Signal too low
- ECM-2B00 Thermostat. Faulty signal
- ECM-303C Front knock sensor (KS). Signal too high
- ECM-303D Front knock sensor (KS). Signal too low
- ECM-304C Rear knock sensor (KS). Signal too high
- ECM-304D Rear knock sensor (KS). Signal too low
- ECM-3050 Knock control. Internal fault
- ECM-3060 Knock control. Internal fault
- ECM-3100 Misfire, at least one cylinder. Start up
- ECM-310C Misfire, at least one cylinder. Catalytic converter damage
- ECM-310D Misfire, at least one cylinder. Affects emissions
- ECM-3110 Misfire cylinder 1. Start up
- ECM-311C Misfire cylinder 1. Catalytic converter damage
- ECM-311D Misfire cylinder 1. Emissions impact
- ECM-3300 Engine speed (RPM) sensor. Signal missing
- ECM-330B Engine speed (RPM) sensor. Signal missing
- ECM-3400 Camshaft position (CMP) sensor, intake. Faulty signal
- ECM-340B Camshaft position (CMP) sensor, intake. Signal missing
- ECM-340C Camshaft position sensor, intake. Signal too high
- ECM-340D Camshaft position sensor, intake. Signal too low
- ECM-3410 Camshaft position (CMP) sensor, exhaust. Faulty signal
- ECM-341B Camshaft position (CMP) sensor, exhaust. Signal missing
- ECM-341C Camshaft position sensor, exhaust. Signal too high
- ECM-341D Camshaft position sensor, exhaust. Signal too low
- ECM-342B Camshaft position (CMP) sensor. Signal missing
- ECM-360B Ignition coil cylinder 1. Signal missing
- ECM-360C Ignition coil cylinder 1. Signal too high
- ECM-360D Ignition coil cylinder 1. Signal too low
- ECM-365C Ignition timing control during cold start
- ECM-400D Three-way catalytic converter (TWC) efficiency, bank 1. Signal too low
- ECM-420C Evaporative emission system (EVAP) valve. Open
- ECM-420D Evaporative emission system (EVAP). Closed
- ECM-421B Canister purge (CP) valve. Signal missing
- ECM-421C Evaporative emission system (EVAP) valve. Signal too high
- ECM-421D Evaporative emission system (EVAP) valve. Signal too low
- ECM-430C Fuel tank system, leakage. Fuel tank filler cap missing
- ECM-431B Leak diagnostic unit, preheating. Signal missing
- ECM-431C Leak diagnostic unit, preheating. Signal too high
- ECM-431D Leak diagnostic unit, preheating. Signal too low
- ECM-432B Leak diagnostic unit, valve. Signal missing
- ECM-432C Leak diagnostic unit, preheating. Signal too high
- ECM-432D Leak diagnostic unit, preheating. Signal too low
- ECM-433B Leak diagnostic unit, pump. Signal missing
- ECM-433C Leak diagnostic unit, pump. Signal too high
- ECM-433D Leak diagnostic unit, pump. Signal too low
- ECM-434C Fuel tank system, leakage. Minor leak
- ECM-4360 Leak diagnostic unit. Faulty signal
- ECM-436B Leak diagnostic unit. Signal missing
- ECM-436C Leak diagnostic unit. Signal too high
- ECM-436D Leak diagnostic unit. Signal too low
- ECM-4380 Fuel tank filler cap missing. Faulty signal
- ECM-439C Fuel tank system, leakage. Major leak
- ECM-442B Fuel level sensor. Signal missing
- ECM-442C Fuel level sensor. Signal too high
- ECM-442D Fuel level sensor. Signal too low
- ECM-4430 Fuel level sensor. Faulty signal
- ECM-5000 Engine speed (RPM) sensor signal. Faulty signal
- ECM-500B Engine speed (RPM) sensor signal. Signal missing
- ECM-500C Engine speed (RPM) sensor signal. Signal too high
- ECM-5100 Malfunction indicator lamp (MIL), transmission control module (TCM). Faulty signal
- ECM-512B Malfunction indicator lamp (MIL) communication. Signal missing
- ECM-5200 Air conditioning (A/C) pressure sensor. Faulty signal
- ECM-520B Air conditioning (A/C) pressure sensor. Signal missing
- ECM-520C Air conditioning (A/C) pressure sensor. Signal too high
- ECM-520D Air conditioning (A/C) pressure sensor. Signal too low
- ECM-531C Vehicle speed signal (VSS). Signal missing
- ECM-5320 Vehicle speed signal (VSS). Faulty signal
- ECM-532D Communication, central electronic module (CEM). Signal too high
- ECM-540B Oil quality, level and temp sensor. Signal missing
- ECM-540C Oil quality, level and temp sensor. Signal too high
- ECM-540D Oil quality, level and temp sensor. Signal too low
- ECM-5500 Oil level sensor. Faulty
- ECM-552C Oil temperature sensor. Signal too high
- ECM-552D Oil temperature sensor. Signal too low
- ECM-600B Turbocharger (TC) control valve. Signal missing
- ECM-600C Turbocharger (TC) control valve. Signal too high
- ECM-600D Turbocharger (TC) control valve. Signal too low
- ECM-603C Turbocharger (TC) control system. Signal too high
- ECM-603D Turbocharger (TC) control system. Signal too low
- ECM-6110 Camshaft position control, intake. Slow
- ECM-611B Camshaft control, intake. Faulty
- ECM-612B Camshaft reset valve, intake. Signal missing
- ECM-612C Camshaft reset valve, intake. Signal too high
- ECM-612D Camshaft reset valve, intake. Signal too low
- ECM-6140 Camshaft control, exhaust. Slow
- ECM-614B Camshaft control, exhaust. Faulty
- ECM-616B Exhaust camshaft reset valve. Signal missing
- ECM-616C Camshaft reset valve, intake. Signal too high
- ECM-616D Camshaft reset valve, intake. Signal too low
- ECM-618C Exhaust camshaft control during cold start
- ECM-619C Inlet camshaft control during cold start
- ECM-620B Engine cooling fan control module. Signal missing
- ECM-620C Engine cooling fan (FC) control module. Signal too high
- ECM-621B Engine cooling fan (FC). Signal missing
- ECM-621C Engine cooling fan (FC). Signal too high
- ECM-621D Engine cooling fan (FC). Signal too low
- ECM-6220 Engine cooling fan (FC). Faulty signal
- ECM-630B A/C relay. Signal missing
- ECM-630C A/C relay. Signal too high
- ECM-630D A/C relay. Signal too low
- ECM-640C Turbocharger (TC) control system. Signal too high
- ECM-640D Turbocharger (TC) control system. Signal too low
- ECM-673C Camshaft position, exhaust. High
- ECM-673D Camshaft position, exhaust. Low
- ECM-674C Camshaft position, intake. High
- ECM-674D Camshaft position, intake. Low
- ECM-700C Engine control module (ECM), internal fault. Signal too high
- ECM-700D Engine control module (ECM), internal fault. Signal too low
- ECM-7010 Engine control module (ECM), temperature. Faulty signal
- ECM-7020 Engine control module (ECM), temperature. Faulty signal
- ECM-7100 Immobilizer communication. Faulty signal
- ECM-710B Immobilizer communication. Signal missing
- ECM-710C Immobilizer Communication. Signal too high
- ECM-710D Immobilizer Communication. Signal too low
- ECM-7110 Immobilizer. Faulty signal
- ECM-711B Immobilizer. Signal missing
- ECM-711C Immobilizer. Signal too high
- ECM-7300 Gear position sensor. Faulty signal
- ECM-730B Gear position sensor. Signal missing
- ECM-740B Communication, central electronic module (CEM). Signal missing
- ECM-740C Communication, central electronic module (CEM). Signal too high
- ECM-800C System relay. Signal too high
- ECM-800D System relay. Signal too low
- ECM-801B System relay. Signal missing
- ECM-801C System relay. Signal too high
- ECM-801D System relay. Signal too low
- ECM-820C Battery voltage. Signal too high
- ECM-820D Battery voltage. Signal too low
- ECM-8210 System relay. Faulty signal
- ECM-8300 Alternator control module (ACM). Faulty
- ECM-830B Alternator control module (ACM). Faulty communication
- ECM-830C Alternator control module (ACM). Faulty signal
- ECM-830D Alternator control module (ACM). Signal too high
- ECM-8410 Autostarting, engine speed. Signal too low
- ECM-841B Autostarting, power supply. Signal too low
- ECM-842C Starter motor relay. Signal too high
- ECM-842D Starter motor relay. Signal too low
- ECM-843B Starter motor relay. Open
- ECM-843C Starter motor relay. Signal too high
- ECM-843D Starter motor relay. Signal too low
- ECM-8500 5 volt power supply. Faulty signal
- ECM-851D 5 volt power supply. Signal too low
- ECM-9000 Brake pedal sensor. Faulty signal
- ECM-900C Brake pedal sensor. Signal too high
- ECM-900D Brake pedal sensor. Signal too low
- ECM-9011 Brake pedal sensor, signal via CAN. Faulty signal
- ECM-901B Brake pedal sensor, signal via CAN. Signal missing
- ECM-901D Brake pedal sensor, signal via CAN. Signal too low
- ECM-9100 Clutch pedal switch. Faulty signal
- ECM-910C Clutch pedal switch. Signal too high
- ECM-910D Clutch pedal switch. Signal too low
- ECM-9110 Clutch pedal position sensor. Faulty signal
- ECM-911B Clutch pedal sensor. Signal missing
- ECM-911C Clutch pedal sensor. Signal too high
- ECM-911D Clutch pedal sensor. Signal too low
- ECM-9200 Throttle position (TP) sensor. Faulty signal
- ECM-9210 Electronic throttle unit, potentiometer 1. Faulty signal
- ECM-921C Electronic throttle unit, potentiometer 1. Signal too high
- ECM-921D Electronic throttle unit, potentiometer 1. Signal too low
- ECM-9220 Electronic throttle unit, potentiometer 2. Faulty signal
- ECM-922C Electronic throttle unit, potentiometer 2. Signal too high
- ECM-922D Electronic throttle unit, potentiometer 2. Signal too low
- ECM-9240 Engine control module (ECM). Faulty signal
- ECM-925C Electronic throttle unit. Signal too high
- ECM-925D Electronic throttle unit. Signal too low
- ECM-926C Electronic throttle unit. Signal too high
- ECM-926D Electronic throttle unit. Signal too low
- ECM-9270 Throttle unit. Faulty signal
- ECM-9280 Throttle unit. Faulty signal
- ECM-929C Engine control module (ECM). Signal too high
- ECM-929D Engine control module (ECM). Signal too low
- ECM-92B0 Electronic throttle unit. Faulty signal
- ECM-92CC Electronic throttle unit. Signal too high
- ECM-92CD Electronic throttle unit. Signal too low
- ECM-92D0 Electronic throttle unit. Faulty signal
ECM-92E0 Engine control module (ECM). Internal fault
- ECM-9300 Control module communication problems. Faulty signal
- ECM-930B Control module communication problems. Signal missing
- ECM-930C Control module, communication problems. Signal too high
- ECM-930D Control module communication problems. Signal too low
- ECM-9400 Accelerator pedal (AP) position sensor, digital signal. Faulty signal
- ECM-940C Accelerator pedal (AP) position sensor, digital signal. Signal too high
- ECM-940D Accelerator pedal (AP) position sensor, digital signal. Signal too low
- ECM-941C Accelerator pedal (AP) position sensor, analog signal. Signal too high
- ECM-941D Accelerator pedal (AP) position sensor, analog signal. Signal too low
- ECM-9430 Accelerator pedal (AP) position sensor, analog signal. Faulty signal
- ECM-943B Accelerator pedal (AP) position sensor, analog signal. Signal missing
- ECM-943C Accelerator pedal (AP) position sensor, analog signal. Signal too high
- ECM-943D Accelerator pedal (AP) position sensor, analog signal. Signal too low
- ECM-950C Engine control module (ECM), idle speed control. Signal too high
- ECM-950D Engine control module (ECM), idle speed control. Signal too low
- ECM-951C Engine control module (ECM), idle speed control. Signal too high
- ECM-951D Engine control module (ECM), idle speed control. Signal too low
- ECM-9700 Accelerator pedal (AP) position sensor, digital signal. Faulty signal
- ECM-970B Accelerator pedal (AP) position sensor, digital signal. Signal missing
- ECM-970C Accelerator pedal (AP) position sensor, digital signal. Signal too high
- ECM-970D Accelerator pedal (AP) position sensor, digital signal. Signal too low
- ECM-9800 Engine control module (ECM), torque signal. Internal fault
- ECM-9810 Engine control module (ECM), engine speed (RPM). Internal fault
- ECM-9820 Engine control module (ECM), load signal. Internal fault
- ECM-9830 Engine control module (ECM). Internal fault
- ECM-983C Engine control module (ECM). Internal fault
- ECM-983D Engine control module (ECM). Internal fault
- ECM-9840 Engine control module (ECM). Internal fault
- ECM-984B Engine control module (ECM). Internal fault
- ECM-985C Engine control module (ECM), fuel shut-off system. Internal fault
- ECM-9860 Engine control module (ECM). Internal fault
- ECM-9970 Memory fault in RAM. Faulty signal
- ECM-9980 Memory fault in ROM. Faulty signal
- ECM-9990 engine control module (ECM). Faulty signal
- ECM-999B Engine control module (ECM). Signal missing
- ECM-999D Engine control module (ECM). Signal too low
- ECM-9A0B Engine control module (ECM). Internal fault
- ECM-A020 Configuration fault. Signal missing
- ECM-A12B Speed signal. Signal missing
- ECM-A12C Speed signal. Signal too high
- ECM-A130 Control module communication. Faulty signal
- ECM-A13C Crash signal
- ECM-A20B Engine control module (ECM). Signal missing
- ECM-A20C Engine control module (ECM). Signal too high
- ECM-E000 Control module communication. Faulty signal
- ECM-E003 Configuration fault. Software fault
- ECM-XXXX Unknown diagnostic trouble code (DTC) for the current control module version
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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