Fuel Level Output Circuit Malfunction


Table of contents

P0656 PONTIAC 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)

How do I fix code P0656 PONTIAC?

  Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.

Cost of diagnosing the P0656 PONTIAC code

  The cost of diagnosing the P0656 PONTIAC code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.

When is the code detected

  If the fault detection circuit senses a voltage other than what the PCM expects, the fault line status changes causing the P0656 code will set.

Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P0656 PONTIAC 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.

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