Powertrain, generic · Vehicle speed, idle control and auxiliary inputs
P05BE Stop-Start Mode Switch Circuit Low
Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo
The stop-start off switch lets the driver disable automatic engine stop for the current drive. It is read directly or via another module over CAN – on Stellantis' 2025 Ram 1500 it sits in the electronic shifter module. CARB names a stop-start diagnosis as its example of an emission-neutral diagnosis, so no warning lamp is required; stop-start is usually just disabled. P05BE means the switch circuit voltage is too low – a signal or reference shorted to ground, or with a resistor ladder a voltage below the lowest valid step. No manufacturer document available to us uses this code.
Likely causes
Signal line shorted to ground
Switch shorted internally (moisture, spilled drink)
5 V reference of the reading module pulled down
Module input
Symptoms
- Stop-start cannot be switched off or stays disabled
- Switch indicator not working
- Usually no check engine light
Repair estimate
DifficultyEasyDIY possible
Parts and labour€30–200
Time0.3–1.5 h
Typical range across vehicles; the real cost depends on what the testing finds.
Parts involved
stop start switchswitch wiringengine control module
Related codes
References: static.nhtsa.gov, vehicleservicepros.com, law.cornell.edu.