Honda Civic P0220: Throttle/Pedal Position Sensor/Switch B Circuit Malfunction diagnosis
Code verification standard
P0220 is published with SAE J2012 / ISO 15031-6 code structure plus Honda Civic diagnostic context.
This page covers meaning, symptoms, first checks, live data, misdiagnosis risk, and repair verification.
What does this mean?
Code P0220 signifies that the Powertrain Control Module (PCM) has detected an electrical circuit malfunction within the Throttle Position Sensor (TPS) or Accelerator Pedal Position Sensor (APPS) "B" circuit. Modern vehicles employ multiple redundant sensors (typically two or three) for both the throttle body and the accelerator pedal to ensure precise and safe throttle control. Sensor "B" is one of these critical inputs, providing a signal to the PCM that is compared against other sensors (like sensor "A"). A "circuit malfunction" can mean a range of issues, including an open circuit, a short to ground, a short to voltage, or an out-of-range signal that doesn't correlate correctly with other sensor inputs. This code often triggers the "limp home" mode, severely limiting engine power to prevent unintended acceleration or other dangerous conditions.
How serious is this code?
Driving with a P0220 code is highly unsafe and not recommended. This code directly impacts the vehicle's ability to control engine power and acceleration. You may experience sudden and unpredictable loss of power, unintended acceleration, or the vehicle entering "limp home" mode, severely limiting speed and power. These conditions significantly increase the risk of an accident, especially in traffic or at higher speeds. Address this issue immediately.
Diagnostic system: General powertrain circuit
On a Honda Civic, the P0220 code should be diagnosed as part of the general powertrain circuit group. Related codes and live data from this same system can change the repair priority, so avoid replacing parts from the code name alone.
Most Common Causes for Honda Civic
- Faulty throttle position sensor (TPS)
- Dirty or faulty throttle body
- Damaged, chafed, or broken wiring harness
- Corroded or loose electrical connector
- Clogged or faulty fuel injector
- Internal PCM/ECM failure
- Faulty fuel pressure regulator
Symptoms to Watch For
- Check Engine Light is illuminated
- Poor acceleration or sluggish response
- Engine surging or fluctuating RPM
- Vehicle enters reduced power / limp mode
- Erratic or fluctuating idle speed
- Engine misfiring or shaking sensation
- Rough or unstable idle
- Significant loss of engine power
Before replacing parts, check these first
- Record freeze-frame data and related codes before clearing the fault.
- Inspect wiring, connectors, vacuum lines, fluid leaks, and fuses tied to the named system.
- Use live data or a multimeter to confirm the failed circuit before replacing parts.
- Check for blown fuses, weak battery voltage, and damaged connectors before buying major parts.
Live data to compare
- Freeze-frame conditions
- Related codes
- Circuit voltage and continuity
How to Diagnose
Common Mistakes
Treating the code description as a parts list instead of verifying the circuit, operating conditions, and related codes. Always confirm the fault with freeze-frame data, live data, visual inspection, and circuit checks before spending money on parts.
Repair verification
After the repair, clear P0220, complete a drive cycle, and confirm the monitor runs without the code returning. Save the before/after scan report if the vehicle needs emissions inspection.
Frequently Asked Questions
Can I drive with the P0220 code?
If the check engine light is solid, you can usually drive to a safe location or mechanic. If the light is flashing, pull over immediately to prevent catastrophic engine or catalytic converter damage.
Will the P0220 code clear itself?
Once the underlying problem is fixed, the engine computer will run its self-checks. If it passes over several drive cycles, the light will turn off automatically. You can also clear it immediately using an OBD2 scanner.
Will this code fail an emissions test?
Yes. If the Check Engine Light is on due to the P0220 code, your Honda will automatically fail an OBD2 plug-in emissions or smog test.
What should I check first for P0220?
Record freeze-frame data and related codes before clearing the fault. Inspect wiring, connectors, vacuum lines, fluid leaks, and fuses tied to the named system. Use live data or a multimeter to confirm the failed circuit before replacing parts.
Join the Discussion
Repair Estimate
Fuse, connector, wiring, cleaning, or basic inspection
Major component replacement after live data and circuit tests confirm failure
Costs vary widely; start with visual inspection and circuit confirmation to avoid unnecessary parts.
DIY Difficulty
Can usually be performed at home with basic hand tools.