Powertrain
generic / SAE
P07BF
Input/Turbine Shaft Speed Sensor A Circuit Low
Input/turbine shaft speed sensor A signal voltage below the lower limit — short to ground or open supply. Without this signal the TCM cannot calculate slip across the torque converter or first gear element.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number7 / BF
Possible causes
- Signal wire shorted to ground high
- Connector pins corroded - high contact resistance low
- Harness chafing through insulation low
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 150–700 €
- Estimated time: 0.5–2.5 h
- Component: input shaft speed sensor a
- Component: sensor wiring
- MIL / check engine light
Sources
References
sae:J2012