Electrical
Vans with Stop-Start Not Working — Common Causes
Stop-start systems stop working when battery charge is low, a sensor has failed, or the engine has not reached operating temperature.
Many modern vans feature stop-start technology to save fuel. When it stops working, the cause is rarely a fault with the system itself. The ECU monitors battery state of charge, engine temperature, outside temperature, and electrical load. If the battery is below 75% charge, the engine is cold, or the air conditioning is demanding power, the system disables itself. A failing auxiliary battery (in vehicles with dual batteries) is a common cause of permanent deactivation. A diagnostic scan shows exactly why the system is not engaging — often it is simply a battery that needs replacing.
Key takeaways
- Stop-start disables itself when the battery charge is low
- A failing auxiliary battery is the most common cause of permanent deactivation
- A simple diagnostic scan reveals the exact reason stop-start is inactive
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