Vehicle speed is sent from ABS(ESC) module. ABS(ESC) calculates the vehicle speed with the wheel speed sensor. Also converts it into the digital signal and sends it to ECM. When DTC P2159 occurs, check the ABS system error first and then check the engine system.
If the vehicle speed signal is below the specified minimum value under driving, ECM sets P0501.
Item
Detecting Condition
Possible cause
DTC Strategy
Plausibility check
Poor connection
Short in harness
ESC(ESP) control unit
ECM
Enable Conditions
Fuel Cut On
ECT > 40?(104?)
1000 < rpm < 4500
Threshold value
Vehicle speed raw signal < 2.5mph
Diagnosis Time
3sec
MIL On Condition
2 Driving Cycles
Fig.1) Normal waveforms of VSS (from ESC(ESP) ECU-5KM/H)