VOLVO
ECM-7620 - Immobilizer. Faulty signal
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
4 modelsC30 (2007–2013), C70 (2006–2013), S40 (2004–2013), V50 (2004–2013)
Show models by year and engine (13)
- Volvo C30 (2007–2013)2007Engine D4164T, D5244T8, D5244T9 only
- Volvo C30 (2007–2013)2008–2010Engine D4164T, D5244T13, D5244T8, D5244T9 only
- Volvo C30 (2007–2013)2011Engine D4164T only
- Volvo C70 (2006–2013)2007Engine D5244T8, D5244T9 only
- Volvo C70 (2006–2013)2008–2010Engine D5244T13, D5244T8, D5244T9 only
- Volvo S40 (2004–2013)2005, 2011Engine D4164T only
- Volvo S40 (2004–2013)2006Engine D4164T, D5244T8 only
- Volvo S40 (2004–2013)2007Engine D4164T, D5244T8, D5244T9 only
- Volvo S40 (2004–2013)2008–2010Engine D4164T, D5244T13, D5244T8, D5244T9 only
- Volvo V50 (2004–2013)2005, 2011Engine D4164T only
- Volvo V50 (2004–2013)2006Engine D4164T, D5244T8 only
- Volvo V50 (2004–2013)2007Engine D4164T, D5244T8, D5244T9 only
- Volvo V50 (2004–2013)2008–2010Engine D4164T, D5244T13, D5244T8, D5244T9 only
What does this fault code mean?
Before the engine is allowed to start, the ECM compares the immobilizer code with the CEM and also checks its own serial number against the BCM's. The fault is set if the supply drops during the check or if the numbers do not match. The engine will not start. The fault applies to the C30, C70 (06-), S40 (04-) and V50.
Possible causes
- Low battery voltage
- Poor contact, corrosion or contact resistance at the ECM connector
- Short to ground or open circuit in the supply or earth wire to the ECM
- Break in the CAN wiring
- Wrong ignition key
- BCM not intended for this car, for example a used module with other software or hardware
What you can do
- 1Check that you are using the correct ignition key and that the battery voltage is normal
- 2Check the ECM connector for looseness, contact resistance and corrosion
- 3With a multimeter, check that the ECM supply wire is not shorted to ground and has no open circuit
- 4Visually inspect the CAN wiring for breaks and chafing
- 5Work on the brake control module (BCM) should go to a workshop, as it controls the braking system; a workshop can compare the serial numbers
Symptoms you may notice1
- The engine will not start
General guidance for car owners. Diagnosis on the car can point to a different cause.