P215F

Throttle/Pedal Position Sensor A/B Voltage Rationality

P215F is a generic OBD-II powertrain diagnostic trouble code: Throttle/Pedal Position Sensor A/B Voltage Rationality. It is logged by the engine control unit when the powertrain monitor detects that a specific fault threshold has been exceeded — typically resulting in the malfunction-indicator lamp (MIL / check-engine light) being illuminated.

Code
P215F
Group
Powertrain
System
Powertrain
Severity
Warning (MIL on, possible limp mode)
Need P215F disabled?
RaceTune permanently disables any OBD-II trouble code on supported ECUs — for motorsport, off-road, and export use.
→

What P215F means

P215F is stored when the ECM determines that the voltage from one or both throttle or pedal position sensor channels is not rational given the current operating conditions. Rationality monitoring compares sensor output against expected values derived from other inputs such as engine load, MAP sensor reading, and accelerator pedal position.

Unlike a simple out-of-range check, a rationality fault means the signal is electrically plausible but does not match what the ECM expects given the context. For example, if the throttle sensor reports wide-open throttle while the pedal sensor reports no driver input, the ECM flags a rationality fault and enters a failsafe strategy.

Causes typically include a mechanically binding throttle plate that does not return to the commanded position, a pedal position sensor that has shifted out of calibration, or a software calibration issue after component replacement. Intermittent faults caused by temperature-sensitive connectors are also common.

Common causes

Most-frequently reported root causes when P215F is logged.

  • 1
    Throttle plate mechanically sticking or binding and not following commanded position.
  • 2
    Accelerator pedal position sensor (APPS) out of calibration or failed.
  • 3
    Signal wire intermittent open causing a momentary out-of-context reading.
  • 4
    Incorrect sensor installed after a previous repair (wrong part number).
  • 5
    ECM software issue requiring a calibration update.
  • 6
    Vacuum leak causing unexpected throttle behavior that conflicts with sensor output.
  • 7
    Carbon buildup restricting throttle plate movement so actual position lags commanded position.

Symptoms drivers notice

MIL on with possible reduced-power mode.
Throttle response feels sluggish or delayed.
Engine may surge or stumble at light throttle inputs.
Idle quality may be poor if the throttle plate does not fully close.
Possible stall on deceleration if the plate sticks partially open.

How to diagnose P215F

A typical diagnostic flow when this code is present.

  1. 1
    Record all DTCs and freeze-frame data with a scan tool.
  2. 2
    Monitor live TPS and APPS voltages simultaneously while slowly depressing and releasing the accelerator pedal.
  3. 3
    Check that actual throttle position closely tracks commanded throttle position in the scan tool data.
  4. 4
    Inspect the throttle body for carbon buildup; clean if throttle plate movement is sluggish.
  5. 5
    Verify accelerator pedal position sensor reference voltage and signal integrity at the connector.
  6. 6
    Check for any applicable ECM software calibration updates for the vehicle.
  7. 7
    After repairs, perform a throttle relearn and road-test through the conditions that triggered the fault.

Related powertrain codes

Frequently asked questions

What is the difference between P215F and P215A?

P215A flags a correlation mismatch between sensor A and B voltages. P215F flags a rationality issue, meaning a sensor reading is internally plausible but contradicts other operating data.

Can a dirty throttle body cause P215F?

Yes. Heavy carbon deposits can cause the throttle plate to stick, making the actual position deviate from the commanded position and triggering a rationality fault.

Is a throttle relearn always needed after clearing P215F?

If the throttle body was cleaned or replaced, a relearn is required. If only a wiring repair was made, a relearn is still recommended as best practice.

Can P215F set alongside pedal sensor codes?

Yes. If the APPS is the root cause, related pedal sensor codes such as P2122 or P2127 may be stored at the same time. Address those codes first.

Disabling P215F in software

RaceTune can permanently disable P215F — and any other OBD-II diagnostic trouble code — on every ECU family we support. The monitor is disabled inside the ECU itself, so the fault stops being logged: the warning light stays off and the engine never enters limp mode for this code. The change is tied to your exact software version.

Permanent
The monitor is disabled in the ECU itself — not just cleared. It cannot return.
Tailored to your file
Each patch is matched to your specific software version — never a one-size-fits-all file.
Reversible
The original file is always preserved. Reflash the stock to return the ECU to factory state.

Software modifications affect emissions compliance and are not road-legal in many jurisdictions. RaceTune service files are intended for motorsport, off-road, and export use.

Got P215F in your scan?

Upload your ECU file — we'll identify the exact software version and confirm whether a disable is available for your car.

Upload your file