VOLVO
ECM-901E - Engine control module (ECM). Internal fault
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
9 modelsC70 Cabriolet (1998–2005), C70 Coupé (1998–2002), S60 (2001–2009), S70 (1997–2000), S80 (1999–2006), V70 (1997–2000), V70 (2000–2008), V70 XC (1998–2000), V70 XC / XC70 (2001–2007)
Show models by year and engine (16)
- Volvo C70 Cabriolet (1998–2005)1999, 2001–2002
- Volvo C70 Cabriolet (1998–2005)2000All engines except: B5244S
- Volvo C70 Coupé (1998–2002)1999All engines except: B5254S DENSO
- Volvo C70 Coupé (1998–2002)2000All engines except: B5244S
- Volvo C70 Coupé (1998–2002)2001–2002
- Volvo S60 (2001–2009)2001All engines except: B5244S, B5244S2, D5244T
- Volvo S70 (1997–2000)1999Engine B5204T3, B5204T4, B5234T3, B5234T7, B5254T only
- Volvo S70 (1997–2000)2000Engine B5204T3, B5204T4, B5234T3, B5234T7, B5244T only
- Volvo S80 (1999–2006)1999–2000All engines except: B5244S, B5244S2, D5252T MSA 15.8
- Volvo S80 (1999–2006)2001Engine B5204T5, B5234T7, B5244T3, B6284T, B6294S only
- Volvo V70 (1997–2000)1999Engine B5204T3, B5204T4, B5234T3, B5234T7, B5234T8, B5254T only
- Volvo V70 (1997–2000)2000All engines except: B5244S, B5244S2, B5244SG, B5244SG2, D5252T MSA 15.8
- Volvo V70 (2000–2008)2000All engines except: D5252T MSA 15.8
- Volvo V70 (2000–2008)2001Engine B5204T5, B5234T3, B5234T7, B5244T3 only
- Volvo V70 XC (1998–2000)1999–2000
- Volvo V70 XC / XC70 (2001–2007)2001
What does this fault code mean?
The engine control module (ECM) runs internal tests on its processor, software and memory, and the code is set when one of them registers a fault. The fault can lie in the control module itself, and it is sometimes set together with other codes. While the fault is active the throttle and cruise control are limited.
Possible causes
- Defective engine control module
- The code can be set together with other codes, which should then also be read out
What you can do
- 1Read the other codes stored at the same time, since this code can be set together with them
- 2Clear the code and road test the car to see whether it comes back
- 3If the fault remains, have a workshop replace the control module and program the new one, since it is supplied without software
Symptoms you may notice4
- The accelerator pedal is ignored when braking
- Cruise control cannot be engaged
- Uneven idle
- The electronic throttle system warning lamp is on
What the fault can affect3
- The throttle follows the accelerator pedal position directly, and fuel cut-off follows the pedal position
- Engine speed is regulated by switching off the injectors one at a time, so idle may feel very uneven
- Cruise control is switched off during the driving cycle in which the fault was detected, and it is available again at the next start if the fault is no longer present
General guidance for car owners. Diagnosis on the car can point to a different cause.