VOLVO
ECM-P023484 - Turbo/Super Charger Overboost Condition. Bus Signal / Message Failures. Signal below allowable range
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
5 modelsS80 (2007–), V70 (2008–), XC60 (2009–), XC70 (2008–), XC90 (2003–)
Show models by year and engine (6)
- Volvo S80 (2007–)2007–2009Engine D5244T4, D5244T5 only
- Volvo V70 (2008–)2008–2009Engine D5244T4, D5244T5 only
- Volvo XC60 (2009–)2009All engines except: B6304T2
- Volvo XC70 (2008–)2008All engines except: B6324S
- Volvo XC70 (2008–)2009Engine D5244T4, D5244T5 only
- Volvo XC90 (2003–)2013–2014Engine D5244T18, D5244T5 only
What does this fault code mean?
The engine control module (ECM) compares the actual boost pressure with the boost pressure it calculates. The fault is set when the two do not agree. It may be caused by the boost pressure sensor, the turbo control motor or the turbocharger.
Possible causes
- Damaged boost pressure sensor (TMAP)
- Damaged turbo control motor
- Damaged turbocharger
What you can do
- 1Read the code, clear it and road test to see whether it returns
- 2If you have a diagnostic tool: read the boost pressure sensor value in live data with the engine at idle, and see whether it changes when the engine runs at higher revs
- 3Look at the boost pressure sensor connector for oxidation and loose connections
- 4Check that the air filter and intake seal properly, and look for air leaks
- 5If the fault remains, have a workshop check the boost pressure sensor, turbo control motor and turbocharger with diagnostic equipment
Symptoms you may notice1
- The car performs worse than usual
What the fault can affect1
- Engine output is limited
General guidance for car owners. Diagnosis on the car can point to a different cause.