I've noticed that many trouble codes use similar wording for the same problem and can't really distinguish between them, for instance.

P0105 Manifold Abs.Pressure or Bar.Pressure Voltage supply

P0106 Manifold Abs.Pressure or Bar.Pressure Range/Performance

P0107 Manifold Abs.Pressure or Bar.Pressure Low Input

P0108 Manifold Abs.Pressure or Bar.Pressure High Input

P0109 Manifold Abs.Pressure or Bar.Pressure Circuit Intermittent


P0116 Engine Coolant Temp.Circ Range/Performance

P0117 Engine Coolant Temp.Circ Low Input

P0118 Engine Coolant Temp.Circ High Input


P0120 Throttle/Pedal Pos.Sensor A Circ Malfunction

P0121 Throttle/Pedal Pos.Sensor A Circ Range/Performance

P0122 Throttle/Pedal Pos.Sensor A Circ Low Input

P0123 Throttle/Pedal Pos.Sensor A Circ High Input

What exactly is meant by Malfunction, Range/Performance, Low Input, High Input and Circuit Intermittent?

  • I'm not really seeing a question here? Also, is this your confusion or the vehicles confusion? Your statement isn't very clear. Could you please edit your question so it actually includes a question and clarify what exactly what problem you are trying to solve? Commented May 27, 2023 at 23:46
  • The question was regarding what the bold text meant. How is a Low input code different from a High input code or even Range/Perfomance. How do you interpret this when troubleshooting a car?
    – Aden
    Commented May 28, 2023 at 1:22

1 Answer 1


First, if you're looking for an answer to "what does a code mean", your best bet is to just Google it. Find out what the code is telling you. This will give you a list of things it might be. You can start your troubleshooting from there.

Now, for what do these things mean ... (these should hold true for most codes, but double check to make sure)

Malfunction - I think this is fairly easy from my standpoint. It means the sensor isn't working. It's either dead, isn't sending a signal, or isn't sending the proper signal.

Range/Performance - The range has to do for the total output of the sensor. In most cases there's going to be a specific voltage range the ECU is expecting. If it isn't performing correctly and giving some kind of weird range which the ECU doesn't understand (ie: it should be .5vdc to 1vdc and is giving .4vdc to 3vdc), the ECU is going to question the sensor and throw the code (this is a crude example). As far as performance, if the ECU is expecting a sensor to behave in a certain way, and yet isn't, then it might throw the code because of this.

Low/High Input - (Throwing these together because it makes sense this way.) If the ECU is expecting the signal from a sensor to only go down to .5vdc and yet is down at .25vdc (or even zero), it might throw this code. The voltage output of the sensor is below the voltage expected for the sensor. Conversely, if output is too high, it would throw the other. In the case of a MAP sensor, it probably means replacement. If you are looking at a throttle pedal, it probably only needs a recalibration.

Circuit Intermittent - To me, this is pretty explanatory, but basically, the signal coming back from the sensor is erratic and isn't continuous, so the ECU calls it out.

You can't expect yourself to know everything listed as an OBDII trouble code, so don't try. All of this stuff, to include explanation and what/how to troubleshoot can pretty easily be found on the internet, so don't limit yourself.

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