Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSVOLVO2009C30 R-DESIGN, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROL MODULE (ECM) DIAGNOSTIC TROUBLE CODES - 7 OF 8
2009 Volvo C30 R-Design, Standard
Engine Control Module (ECM) Diagnostic Trouble Codes - 7 Of 8
2009 Volvo C30 R-Design, StandardSECTION Engine Control Module (ECM) Diagnostic Trouble Codes - 7 Of 8
- ECM-801B: System Relay. Signal Missing (B5254T3; 2007)
- ECM-801B: System Relay. Signal Missing (B5254T7; 2008-2013)
- ECM-801C: System Relay. Signal Too High (B5254T3; 2007)
- ECM-801C: System Relay. Signal Too High (B5254T7; 2008-2013)
- ECM-801D: System Relay. Signal Too Low (B5254T3; 2007)
- ECM-801D: System Relay. Signal Too Low (B5254T7; 2008-2013)
- ECM-820A: System Relay. Faulty Signal (B5244S4; 2007-2011)
- ECM-820C: Battery Voltage. Signal Too High (B5254T3; 2007)
- ECM-820C: Battery Voltage. Signal Too High (B5254T7; 2008-2013)
- ECM-820D: Battery Voltage. Signal Too Low (B5254T3; 2007)
- ECM-820D: Battery Voltage. Signal Too Low (B5254T7; 2008-2013)
- ECM-8210: System Relay. Faulty Signal (B5254T3; 2007)
- ECM-8210: System Relay. Faulty Signal (B5254T7; 2008-2013)
- ECM-8300: Alternator Control Module (ACM). Faulty (B5254T3; 2007)
- ECM-8300: Alternator Control Module (ACM). Faulty (B5254T7; 2008-2013)
- ECM-830B: Alternator Control Module (ACM). Faulty Communication (B5254T3; 2007)
- ECM-830B: Alternator Control Module (ACM). Faulty Communication (B5254T7; 2008-2013)
- ECM-830C: Alternator Control Module (ACM). Faulty Signal (B5254T3; 2007)
- ECM-830C: Alternator Control Module (ACM). Faulty Signal (B5254T7; 2008-2013)
- ECM-830D: Alternator Control Module (ACM). Signal Too High (B5254T3; 2007)
- ECM-830D: Alternator Control Module (ACM). Signal Too High (B5254T7; 2008-2013)
- ECM-8400: 5 Volt Power Supply. Signal Too High (B5244S4; 2007-2011)
- ECM-8400: 5 Volt Power Supply. Signal Too Low (B5244S4; 2007-2011)
- ECM-8410: AUTOSTARTING, Engine Speed. Signal Too Low (B5254T3; 2007)
- ECM-8410: AUTOSTARTING, Engine Speed. Signal Too Low (B5254T7; 2008-2013)
- ECM-841B: AUTOSTARTING, Power Supply. Signal Too Low (B5254T3; 2007)
- ECM-841B: AUTOSTARTING, Power Supply. Signal Too Low (B5254T7; 2008-2013)
- ECM-842C: Starter Motor Relay. Signal Too High (B5254T3; 2007)
- ECM-842C: Starter Motor Relay. Signal Too High (B5254T7; 2008-2013)
- ECM-842D: Starter Motor Relay. Signal Too Low (B5254T3; 2007)
- ECM-842D: Starter Motor Relay. Signal Too Low (B5254T7; 2008-2013)
- ECM-843B: Starter Motor Relay. Open (B5254T3; 2007)
- ECM-843B: Starter Motor Relay. Open (B5254T7; 2008-2013)
- ECM-843C: Starter Motor Relay. Signal Too High (B5254T3; 2007)
- ECM-843C: Starter Motor Relay. Signal Too High (B5254T7; 2008-2013)
- ECM-843D: Starter Motor Relay. Signal Too Low (B5254T3; 2007)
- ECM-843D: Starter Motor Relay. Signal Too Low (B5254T7; 2008-2013)
- ECM-8500: 5 Volt Power Supply. Faulty Signal (B5254T3; 2007)
- ECM-8500: 5 Volt Power Supply. Faulty Signal (B5254T7; 2008-2013)
- ECM-851D: 5 Volt Power Supply. Signal Too Low (B5254T3; 2007)
- ECM-851D: 5 Volt Power Supply. Signal Too Low (B5254T7; 2008-2013)
- ECM-9000: Brake Pedal Sensor. Faulty Signal (B5254T3; 2007)
- ECM-9000: Brake Pedal Sensor. Faulty Signal (B5254T7; 2008-2013)
- ECM-900C: Brake Pedal Sensor. Signal Too High (B5254T3; 2007)
- ECM-900C: Brake Pedal Sensor. Signal Too High (B5254T7; 2008-2013)
- ECM-900C: Engine Control Module (ECM). Internal Fault (B5244S4; 2007-2011)
- ECM-900D: Brake Pedal Sensor. Signal Too Low (B5254T3; 2007)
- ECM-900D: Brake Pedal Sensor. Signal Too Low (B5254T7; 2008-2013)
- ECM-900E: Engine Control Module (ECM). Internal Fault (B5244S4; 2007-2011)
- ECM-9011: Brake Pedal Sensor, Signal Via Can. Faulty Signal (B5254T3; 2007)
- ECM-9011: Brake Pedal Sensor, Signal Via Can. Faulty Signal (B5254T7; 2008-2013)
- ECM-901B: Brake Pedal Sensor, Signal Via Can. Signal Missing (B5254T3; 2007)
- ECM-901B: Brake Pedal Sensor, Signal Via Can. Signal Missing (B5254T7; 2008-2013)
- ECM-901D: Brake Pedal Sensor, Signal Via Can. Signal Too Low (B5254T3; 2007)
- ECM-901D: Brake Pedal Sensor, Signal Via Can. Signal Too Low (B5254T7; 2008-2013)
- ECM-902C: Engine Control Module (ECM). Internal Fault (B5244S4; 2007-2011)
- ECM-9100: Clutch Pedal Switch. Faulty Signal (B5254T3; 2007)
- ECM-9100: Clutch Pedal Switch. Faulty Signal (B5254T7; 2008-2013)
- ECM-910C: Clutch Pedal Switch. Signal Too High (B5254T3; 2007)
- ECM-910C: Clutch Pedal Switch. Signal Too High (B5254T7; 2008-2013)
- ECM-910D: Clutch Pedal Switch. Signal Too Low (B5254T3; 2007)
- ECM-910D: Clutch Pedal Switch. Signal Too Low (B5254T7; 2008-2013)
- ECM-9110: Clutch Pedal Position Sensor. Faulty Signal (B5254T3; 2007)
- ECM-9110: Clutch Pedal Position Sensor. Faulty Signal (B5254T7; 2008-2013)
- ECM-911B: Clutch Pedal Sensor. Signal Missing (B5254T3; 2007)
- ECM-911B: Clutch Pedal Sensor. Signal Missing (B5254T7; 2008-2013)
- ECM-911C: Clutch Pedal Sensor. Signal Too High (B5254T3; 2007)
- ECM-911C: Clutch Pedal Sensor. Signal Too High (B5254T7; 2008-2013)
- ECM-911D: Clutch Pedal Sensor. Signal Too Low (B5254T3; 2007)
- ECM-911D: Clutch Pedal Sensor. Signal Too Low (B5254T7; 2008-2013)
- ECM-914C: Throttle Unit. Faulty Signal (B5244S4; 2007-2011)
- ECM-914C: Throttle Unit. Signal Too High (B5244S4; 2007-2011)
- ECM-914C: Throttle Unit. Signal Too Low (B5244S4; 2007-2011)
- ECM-91AC: Throttle Unit. Current Too High (B5244S4; 2007-2011)
- ECM-91AC: Throttle Unit. Faulty Signal (B5244S4; 2007-2011)
- ECM-91AC: Throttle Unit. Throttle Jammed (B5244S4; 2007-2011)
- ECM-9200: Cruise Control. Faulty Signal (B5244S4; 2007-2011)
- ECM-9200: Throttle Position (TP) Sensor. Faulty Signal (B5254T3; 2007)
- ECM-9200: Throttle Position (TP) Sensor. Faulty Signal (B5254T7; 2008-2013)
- ECM-9210: Electronic Throttle Unit, Potentiometer 1. Faulty Signal (B5254T3; 2007)
- ECM-9210: Electronic Throttle Unit, Potentiometer 1. Faulty Signal (B5254T7; 2008-2013)
- ECM-921C: Electronic Throttle Unit, Potentiometer 1. Signal Too High (B5254T3; 2007)
- ECM-921C: Electronic Throttle Unit, Potentiometer 1. Signal Too High (B5254T7; 2008-2013)
- ECM-921D: Electronic Throttle Unit, Potentiometer 1. Signal Too Low (B5254T3; 2007)
- ECM-921D: Electronic Throttle Unit, Potentiometer 1. Signal Too Low (B5254T7; 2008-2013)
- ECM-9220: Electronic Throttle Unit, Potentiometer 2. Faulty Signal (B5254T3; 2007)
- ECM-9220: Electronic Throttle Unit, Potentiometer 2. Faulty Signal (B5254T7; 2008-2013)
- ECM-922C: Cruise Control. Communication Fault (B5244S4; 2007-2011)
- ECM-922C: Electronic Throttle Unit, Potentiometer 2. Signal Too High (B5254T3; 2007)
- ECM-922C: Electronic Throttle Unit, Potentiometer 2. Signal Too High (B5254T7; 2008-2013)
- ECM-922D: Electronic Throttle Unit, Potentiometer 2. Signal Too Low (B5254T3; 2007)
- ECM-922D: Electronic Throttle Unit, Potentiometer 2. Signal Too Low (B5254T7; 2008-2013)
- ECM-9240: Engine Control Module (ECM). Faulty Signal (B5254T3; 2007)
- ECM-9240: Engine Control Module (ECM). Faulty Signal (B5254T7; 2008-2013)
- ECM-925C: Electronic Throttle Unit. Signal Too High (B5254T3; 2007)
- ECM-925C: Electronic Throttle Unit. Signal Too High (B5254T7; 2008-2013)
- ECM-925D: Electronic Throttle Unit. Signal Too Low (B5254T3; 2007)
- ECM-925D: Electronic Throttle Unit. Signal Too Low (B5254T7; 2008-2013)
- ECM-926C: Electronic Throttle Unit. Signal Too High (B5254T3; 2007)
- ECM-926C: Electronic Throttle Unit. Signal Too High (B5254T7; 2008-2013)
- ECM-926D: Electronic Throttle Unit. Signal Too Low (B5254T3; 2007)
- ECM-926D: Electronic Throttle Unit. Signal Too Low (B5254T7; 2008-2013)
- ECM-9270: Throttle Unit. Faulty Signal (B5254T3; 2007)
- ECM-9270: Throttle Unit. Faulty Signal (B5254T7; 2008-2013)
- ECM-9280: Throttle Unit. Faulty Signal (B5254T3; 2007)
- ECM-9280: Throttle Unit. Faulty Signal (B5254T7; 2008-2013)
- ECM-929C: Engine Control Module (ECM). Signal Too High (B5254T3; 2007)
- ECM-929C: Engine Control Module (ECM). Signal Too High (B5254T7; 2008-2013)
- ECM-929D: Engine Control Module (ECM). Signal Too Low (B5254T3; 2007)
- ECM-929D: Engine Control Module (ECM). Signal Too Low (B5254T7; 2008-2013)
- ECM-92B0: Electronic Throttle Unit. Faulty Signal (B5254T3; 2007)
- ECM-92B0: Electronic Throttle Unit. Faulty Signal (B5254T7; 2008-2013)
- ECM-92CC: Electronic Throttle Unit. Signal Too High (B5254T3; 2007)
- ECM-92CC: Electronic Throttle Unit. Signal Too High (B5254T7; 2008-2013)
- ECM-92CD: Electronic Throttle Unit. Signal Too Low (B5254T3; 2007)
- ECM-92CD: Electronic Throttle Unit. Signal Too Low (B5254T7; 2008-2013)
- ECM-92D0: Electronic Throttle Unit. Faulty Signal (B5254T3; 2007)
- ECM-92D0: Electronic Throttle Unit. Faulty Signal (B5254T7; 2008-2013)
- ECM-92E0: Engine Control Module (ECM). Internal Fault (B5254T3; 2007)
- ECM-92E0: Engine Control Module (ECM). Internal Fault (B5254T7; 2008-2013)
- ECM-9300: Control Module Communication Problems. Faulty Signal (B5254T3; 2007)
- ECM-9300: Control Module Communication Problems. Faulty Signal (B5254T7; 2008-2013)
- ECM-930B: Control Module Communication Problems. Signal Missing (B5254T3; 2007)
- ECM-930B: Control Module Communication Problems. Signal Missing (B5254T7; 2008-2013)
- ECM-930C: Clutch Pedal Sensor. Diagnostic Trouble Code (DTC) In The Central Electronic Module (CEM) (B5244S4; 2007-2011)
- ECM-930C: Control Module, Communication Problems. Signal Too High (B5254T3; 2007)
- ECM-930C: Control Module, Communication Problems. Signal Too High (B5254T7; 2008-2013)
- ECM-930D: Control Module Communication Problems. Signal Too Low (B5254T3; 2007)
- ECM-930D: Control Module Communication Problems. Signal Too Low (B5254T7; 2008-2013)
- ECM-931C: Clutch Pedal Switch. Faulty Signal (B5244S4; 2007-2011)
- ECM-9400: Accelerator Pedal (AP) Position Sensor, Digital Signal. Faulty Signal (B5254T3; 2007)
- ECM-9400: Accelerator Pedal (AP) Position Sensor, Digital Signal. Faulty Signal (B5254T7; 2008-2013)
- ECM-940C: Brake Pedal Sensor. Signal Missing (B5244S4; 2007-2011)
- ECM-940C: Accelerator Pedal (AP) Position Sensor, Digital Signal. Signal Too High (B5254T3; 2007)
- ECM-940C: Accelerator Pedal (AP) Position Sensor, Digital Signal. Signal Too High (B5254T7; 2008-2013)
- ECM-940C: Brake Pedal Sensor. Faulty Signal (B5244S4; 2007-2011)
- ECM-940D: Accelerator Pedal (AP) Position Sensor, Digital Signal. Signal Too Low (B5254T3; 2007)
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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.