P1256 OBD Code Definition:
P1256 Pedal Correlation PDS1 and HPDS
P1256 OBD Code Description:
Possible Symptoms
- Difficulties with starting a cold engine.
- Diesel: an indication is extreme long time burning time of the glow indication light.
- Starting the engine when engine is warmish or warm, idle rpm immediately is 1200 – 3000 rpm.
- RPM at idle is irregular.
- With all engine temperatures seldom idle rpm will vary between 900 – 1000 rpm.
- With engine warm (90 °C) the engine temperature suddenly drops (70 °C) and slowly comes back to 90 °C.
- Bad acceleration during warming up.
Possible Causes
- Wiring and/or connections faulty
- Engine Coolant Temperature Sensor faulty
Possible Solutions
- Check wiring and connections
- Check / Replace Engine Coolant Temperature Sensor