P0220 medium Severity

P0220: Throttle/Pedal Position Sensor/Switch "B" Circuit Malfunction

Check Engine light illuminated; possible reduced throttle response, engine hesitation, or limp mode limiting power

Overview

P0220 throttle pedal position sensor B circuit malfunction indicating throttle/Pedal position sensor or wiring fault causing out-of‑range voltage to PCM

Common Symptoms

  • Check Engine Light illuminated
  • Poor or erratic throttle response
  • Engine hesitation or stumbling during acceleration
  • Reduced engine power or limp mode activation
  • Hard starting or stalling in some cases

Most Common Causes

Faulty throttle position sensor (TPS) high

Sensor may send erroneous voltage outside expected range, triggering the code

Faulty accelerator pedal position (APP) sensor or switch medium

Some vehicles integrate pedal position sensing correlated with TPS data

Wiring harness damage, short, open, or poor connection high

Corroded or loose connectors and wiring can cause intermittent or incorrect signals

Carbon build‑up or mechanical issue at throttle body medium

Contaminated throttle body can affect sensor operation indirectly

ECM malfunction or software issue low

Rare but possible if all sensors and wiring test good

Diagnostic Steps

  1. Use an OBD‑II scanner to confirm P0220 and check for related codes
    Expected: P0220 present; possible additional codes like P0120/P0221
    Interpretation: Confirms throttle/Pedal position circuit fault signals
  2. Visually inspect wiring and connectors at throttle body and pedal assemblies
    Expected: Check for corrosion, loose clips, broken wires
    Interpretation: Poor connections or damaged wiring can cause erratic signals
  3. Measure TPS/APP sensor voltage with multimeter while slowly varying throttle
    Expected: Smooth voltage change within manufacturer specification (e.g., ~0.5 to ~4.5V)
    Interpretation: Erratic or flat voltage trace indicates sensor or circuit fault
  4. Perform continuity checks on signal and ground circuits
    Expected: Continuity between sensor ground and PCM ground; signal wire continuity
    Interpretation: Broken or shorted wires identified if continuity fails
  5. Replace suspect sensor or repair wiring and clear codes; test drive
    Expected: Code clears; symptoms resolved
    Interpretation: Successful repair if code does not return

Repair Solutions

Repair or replace damaged wiring/connectors in sensor circuit medium
Estimated Cost: $50 - $200

Costs vary with extent of harness repair

Replace throttle position sensor (TPS) medium
Estimated Cost: $100 - $400

Includes part and labor; varies by vehicle

Replace accelerator pedal position (APP) sensor if applicable medium
Estimated Cost: $150 - $300

Required on some models with integrated pedal sensors

Throttle body cleaning or service medium
Estimated Cost: $80 - $250

Helpful if contamination affects sensor performance

ECM software update or replacement hard
Estimated Cost: $200 - $800

Rare; pursue only after ruling out sensors and wiring

Common Misdiagnoses

Avoid these common diagnostic mistakes:

  • Replacing TPS without checking wiring and connectors
  • Mistaking APP sensor or floor mat interference as sensor failure
  • Assuming only throttle body contamination is cause without testing electrical signals

Frequently Asked Questions

What does a P0220 diagnostic trouble code signify?

Technically, the P0220 code represents Throttle/Pedal Position Sensor/Switch "B" Circuit Malfunction. It usually points to a fault within the Sensors.

Can P0220 cause engine damage?

This is a medium priority issue. Check Engine light illuminated; possible reduced throttle response, engine hesitation, or limp mode limiting power

What happens when the P0220 code is active?

Common symptoms include: Check Engine Light illuminated, Poor or erratic throttle response, Engine hesitation or stumbling during acceleration. You might also notice the Check Engine Light is on.

Why is my car throwing a P0220 code?

It can be caused by several factors, most notably: Faulty throttle position sensor (TPS), Faulty accelerator pedal position (APP) sensor or switch, Wiring harness damage, short, open, or poor connection.

Is P0220 expensive to fix?

It depends on what needs to be fixed. Repair or replace damaged wiring/connectors in sensor circuit repairs are cheaper (~$200), while ECM software update or replacement repairs are on the higher end (~$800).

Is P0220 a generic or manufacturer-specific code?

Yes, P0220 is a generic code that applies to all OBD-II compliant vehicles, including Ford, Toyota, Honda, Chevrolet, Nissan, Dodge, BMW, and more.

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