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Code C91

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Does anyone have a list of the codes , i have C91
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Here are some common fault codes for Suzuki ATV with Fuel Injection (FI) system:
  • C12: Camshaft position sensor circuit malfunction
  • C13: Intake air pressure sensor circuit malfunction
  • C14: Throttle position sensor circuit malfunction
  • C15: Engine coolant temperature sensor circuit malfunction
  • C21: Intake air temperature sensor circuit malfunction
  • C22: Atmospheric pressure sensor circuit malfunction
  • C23: Tip-over sensor circuit malfunction
  • C24: Ignition signal #1 circuit malfunction
  • C25: Ignition signal #2 circuit malfunction
  • C31: Gear position sensor circuit malfunction
  • C32: Injector circuit malfunction
  • C41: Fuel pump relay circuit malfunction
  • C42: Ignition switch signal circuit malfunction
  • C44: Heated oxygen sensor circuit malfunction
  • C49: PAIR control solenoid valve circuit malfunction
  • C50: ECT sensor circuit malfunction (FI indicator light remains on)


    I could not find any C91 code information. Though if somebody else knows hopefully they’ll chime in. Lastly, what model/year Suzuki are we dealing with..?
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Here are some common fault codes for Suzuki ATV with Fuel Injection (FI) system:
  • C12: Camshaft position sensor circuit malfunction
  • C13: Intake air pressure sensor circuit malfunction
  • C14: Throttle position sensor circuit malfunction
  • C15: Engine coolant temperature sensor circuit malfunction
  • C21: Intake air temperature sensor circuit malfunction
  • C22: Atmospheric pressure sensor circuit malfunction
  • C23: Tip-over sensor circuit malfunction
  • C24: Ignition signal #1 circuit malfunction
  • C25: Ignition signal #2 circuit malfunction
  • C31: Gear position sensor circuit malfunction
  • C32: Injector circuit malfunction
  • C41: Fuel pump relay circuit malfunction
  • C42: Ignition switch signal circuit malfunction
  • C44: Heated oxygen sensor circuit malfunction
  • C49: PAIR control solenoid valve circuit malfunction
  • C50: ECT sensor circuit malfunction (FI indicator light remains on)


    I could not find any C91 code information. Though if somebody else knows hopefully they’ll chime in. Lastly, what model/year Suzuki are we dealing with..?
2016 king quad
C91 is the "Vehicle Speed Sensor Circuit" malfunction. Speed sensor is not talking to the ECM when the machine is running. The sensor is on the left side of the crank case, just to the rear of the oil fill. If the sensor isnt faulty, most likely a wire or ground issue.
C91 is the "Vehicle Speed Sensor Circuit" malfunction. Speed sensor is not talking to the ECM when the machine is running. The sensor is on the left side of the crank case, just to the rear of the oil fill. If the sensor isnt faulty, most likely a wire or ground issue.
Just the man I was hoping would chime in on this subject. Had a feeling you might have an idea on what that code would be.
C91 is the "Vehicle Speed Sensor Circuit" malfunction. Speed sensor is not talking to the ECM when the machine is running. The sensor is on the left side of the crank case, just to the rear of the oil fill. If the sensor isnt faulty, most likely a wire or ground issue.
Thank you . I now have a place to start looking .
C91 is the "Vehicle Speed Sensor Circuit" malfunction. Speed sensor is not talking to the ECM when the machine is running. The sensor is on the left side of the crank case, just to the rear of the oil fill. If the sensor isnt faulty, most likely a wire or ground issue.
I found the problem ,thankyou . A stick broke the sensor , need to order new one .
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