P0656 Audi Fuel Level Output Circuit Malfunction
Possible causes
– Faulty Fuel Level Gauge
– Fuel Level Gauge harness is open or shorted
– Fuel Level Gauge circuit poor electrical connection
– Faulty Powertrain Control Module (PCM)
– Fuel Level Gauge harness is open or shorted
– Fuel Level Gauge circuit poor electrical connection
– Faulty Powertrain Control Module (PCM)
What about the obd code?
If the fault detection circuit senses a voltage other than what the PCM expects, the fault line status changes causing the P0656 Audi code will set.
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
P0656 Audi Description
The Powertrain Control Module (PCM) controls the fuel gauge through the fuel gauge control circuit. The PCM supplies a pulse width modulated (PWM) duty cycle signal to control the fuel gauge. The PCM receives the fuel level information from the fuel level sensor.
The PCM controls the gauge by grounding the control circuit via an internal switch called a driver. The primary function of the driver is to supply the ground for the controlled component. Each driver has a fault line which the PCM monitors.
Audi Vehicle:Audi A1,Audi A3,Audi A1,Audi A3,Audi A1,Audi A3,Audi A4,Audi A5,Audi Q3,Audi A5,Audi Q5,Audi A3,Audi A4,Audi A5,Audi TT,Audi Q3,Audi Q5,Audi S3,Audi TTS,Audi RS 3,Audi TT RS,Audi A7,Audi Q7,Audi A8,Audi A6,Audi S4,Audi S5,Audi Q5,Audi S6,Audi S8,Audi S5,Audi A8,Audi R8 V8,Audi RS 5,Audi S6,Audi R8 V10,Audi R8 GT,Audi A8L