P0228 The signal from the third throttle or pedal position sensor (C) is higher than the circuit should ever produce.

Throttle/pedal position sensor C circuit high

P0228 in short

P0228 means the computer has found a high input in the circuit of throttle or pedal position sensor C. Wiring, connectors and the sensor itself are the usual causes. Power may be reduced, so get it checked soon and stop if the engine loses power while you drive.

Electronic throttles use several position sensors so the computer can check them against each other. P0228 is set for sensor C: The signal from the third throttle or pedal position sensor (C) is higher than the circuit should ever produce.

TroubleCodes.net says the usual causes are wiring or connector damage and a failed sensor, with throttle body wear or carbon and the computer itself far less likely.

Most likely causes

These are general causes for this code across vehicles. None is specific to one make or model.

  1. Damaged, corroded or loose wiring or connector

    Common general cause
    Why it ranks here
    TroubleCodes.net lists wiring and connector damage first for this code, and circuit faults are most often an electrical connection problem.
    What would change this
    Rises if the signal jumps when the harness or connector is moved. Falls if the connector and harness check clean.

  2. Failed throttle or pedal position sensor

    Common general cause
    Why it ranks here
    TroubleCodes.net lists defective throttle or pedal sensors; sensors are often built into the throttle body or pedal assembly.
    What would change this
    Rises if wiring and reference voltage test good but the signal is still wrong. Falls if the circuit fault is found first.
    How to test the electronic throttle body

  3. Charging system putting out too much voltage

    Possible — needs testing
    Why it ranks here
    TroubleCodes.net notes a defective alternator producing excess voltage and says high input codes often start in the charging system.
    What would change this
    Rises if battery voltage reads well above normal with the engine running. Falls if charging voltage is normal.

  4. Throttle body wear or carbon buildup

    Possible — needs testing
    Why it ranks here
    TroubleCodes.net lists mechanical wear and carbon restricting the throttle plate, but this ranks below electrical causes.
    What would change this
    Rises if the throttle plate is visibly sticky or dirty. Falls if it moves freely.
    How to test the electronic throttle body

What to test first

Start at step 1. Each result tells you what it means and where to go next.

  1. Read all stored codes and watch the throttle and pedal position sensor values on a scan tool while slowly pressing the pedal.

    Low riskTool: OBD-II scan tool

    • IfSensor C reading jumps, drops out or is stuck

      It meansLook at the wiring and connector.

      Go to step 2

    • IfReading is smooth and steady

      It meansThe fault may be intermittent or heat related; check the harness anyway.

      Go to step 2

  2. Look over the sensor connector and harness for corrosion, damage and loose pins, and wiggle the harness while watching the reading.

    Use cautionTool: Scan tool, flashlight

    Warning:Keep fingers out of the throttle bore with the ignition on; an electronic throttle can move on its own.

  3. Measure reference voltage, signal and ground at the sensor connector against the service manual, and check resistance.

    Best left to a shopTool: Digital multimeter

    Warning:Back-probe gently and never short the reference pin to ground; that can damage the engine computer.

Symptoms

  • Check engine light
  • Reduced power or slow acceleration
  • Rough idle or hard starting
  • Hesitation or stalling Gets more serious: stop and have it checked.

How to fix

Parts and cost context

  • Electronic throttle body:The sensor is usually part of the throttle body, so it is replaced as a unit and a throttle relearn is needed. Labour varies; get a quote.

Labor varies by vehicle and shop; get a quote before you approve a repair.

Compare used part prices on PartPriceGuide

On your vehicle

Nissan

  • 2002 · Maxima

    Supported by vehicle data

    Nissan bulletin NTB01072 covers the MIL on with P0228 and/or P1228 (accelerator pedal position sensor) stored on the 2002 Maxima. Whether it is still current is not verified.

  • NTB01072Status unverified

    MIL on with DTC P0228 and/or P1228 (accelerator pedal position sensor)

    2002maxima · issued · NHTSA 627461

    Nissan bulletin about the MIL on with DTC P0228 and/or P1228 stored for the accelerator pedal position sensor. The summary does not give the repair.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • P0225The computer sees a signal from the third throttle or pedal position sensor (C) that does not make sense for the conditions, so it flags a circuit fault.

    Shares causes Common general cause

    P0225 is the same sensor C circuit with a different fault type.

  • P0226The signal from the third throttle or pedal position sensor (C) is in range but does not match what the engine is doing.

    Shares causes Common general cause

    P0226 is the same sensor C circuit with a different fault type.

  • P0227The signal from the third throttle or pedal position sensor (C) is lower than the circuit should ever produce.

    Shares causes Common general cause

    P0227 is the same sensor C circuit with a different fault type.

All Electronic throttle and accelerator pedal codes

Sources and review

  1. P0228 - Throttle/Pedal Position Sensor/Switch C Circuit High Input — TroubleCodes.net
  2. On-Board Diagnostic Trouble Codes (generic code title list) — Delaware Division of Motor Vehicles
  3. NTB01072: MIL on with DTC P0228 and/or P1228 (accelerator pedal position sensor) — Nissan
Last reviewed
Written by
Saurabh K.
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