P0221
Fix within a few daysYour engine computer detects an issue with the throttle or accelerator pedal position sensor 'B' circuit's signal range or performance.
Code P0221 means your engine computer detects an issue with the throttle or pedal position sensor 'B' circuit. Common causes: Faulty sensor (60%), wiring issues (20%), dirty throttle body (15%). Drivability: Limit driving, fix within a few days. Repair cost: $30-$400 DIY, $100-$700 professional.
Can I Drive With P0221?
Limit driving, fix within a few days
Essential trips under 10 miles, avoid highways and heavy traffic. Be prepared for sudden power loss or stalling.
Stop driving immediately if: Flashing CEL, engine stalls repeatedly, complete loss of accelerator pedal response.
Symptoms of P0221
- 1Reduced engine power or 'limp mode'
- 2Erratic or high idle
- 3Engine stalling
- 4Hesitation or no response when pressing the accelerator pedal
- 5Check Engine Light is on
Common Causes of P0221
Parts most likely causing this code, ranked by probability
The sensor itself has failed internally, sending an incorrect or inconsistent signal to the engine computer.
60% of P0221 cases are fixed by replacing this part
Damaged, corroded, or loose wires and connectors between the sensor and the engine computer disrupt the signal.
20% of P0221 cases are fixed by repairing wiring
Carbon buildup or a failing internal motor in the electronic throttle body can cause the throttle plate to stick or not respond correctly, leading to incorrect sensor readings.
15% of P0221 cases are fixed by cleaning or replacing the throttle body
A rare internal failure of the engine computer can cause it to misinterpret sensor signals or fail to process them correctly.
5% of P0221 cases are fixed by replacing the PCM
Check These First (Before Buying Parts)
- Visually inspect the wiring harness and connectors for the throttle position sensor (TPS) or accelerator pedal position sensor (APPS) for any obvious damage, corrosion, or loose connections.
- Check the throttle body for excessive carbon buildup around the throttle plate. A dirty throttle body can restrict movement and cause sensor errors.
- Clear the code with a scan tool and see if it immediately returns. Sometimes, a temporary glitch can trigger the code.
How to Diagnose P0221
- 1Visually inspect the throttle body and accelerator pedal area for any obvious damage, loose connections, or debris.
- 2Check the wiring harness and connectors for the TPS/APPS for any signs of fraying, corrosion, or damage.
- 3Use an OBD-II scan tool with live data to monitor the TPS/APPS 'B' sensor voltage while slowly pressing the accelerator pedal. Look for smooth, consistent voltage changes without drops or spikes.
- 4If readings are erratic, test the TPS/APPS sensor directly with a multimeter for proper resistance and voltage output.
- 5If the sensor tests good, check for continuity and proper voltage at the sensor's wiring harness connector.
P0221 on Popular Vehicles
Toyota Camry
2007-2024Many Camry models use an electronic throttle body where the TPS is integrated. Failures often require replacing the entire throttle body assembly. Sometimes, a thorough cleaning can resolve issues caused by carbon buildup.
70% fixed by cleaning or replacing throttle body
Honda Accord
2003-2024Honda Accords are prone to electronic throttle body issues, especially with higher mileage. Symptoms like erratic idle or limp mode are common. Inspecting the wiring and cleaning the throttle body are crucial first steps.
65% fixed by cleaning throttle body or repairing wiring
Ford F-150
2004-2024Ford F-150 trucks frequently experience electronic throttle body failures, leading to P0221 and similar codes. This often results in a sudden loss of power or 'limp mode'. Replacement of the throttle body is a common fix.
75% fixed by replacing throttle body
Frequently Asked Questions
What does P0221 mean?
P0221 indicates that your vehicle's engine computer has detected a problem with the signal from the 'B' circuit of the throttle position sensor (TPS) or accelerator pedal position sensor (APPS). The signal is either out of its expected range or inconsistent with other sensor readings.
Can I drive with P0221?
Limit driving, fix within a few days. This code can cause unpredictable throttle response, reduced power, or even stalling, which creates unsafe driving conditions. Avoid highways and long trips until repaired.
Will P0221 clear itself?
No, P0221 will not clear itself. The underlying mechanical or electrical issue causing the incorrect sensor signal must be diagnosed and repaired before the code will clear. Even if the Check Engine Light temporarily goes off, the problem is still present and will return.
How do I fix P0221 myself?
Start by inspecting the wiring and connectors for damage. If they look good, use a scan tool to monitor the TPS/APPS 'B' sensor live data. If the readings are erratic, replace the faulty throttle position sensor or accelerator pedal position sensor. If the throttle body is dirty, clean it thoroughly.
How much does it cost to fix P0221?
DIY repair costs range from $30 to $400, depending on whether you need a new sensor or a throttle body. Professional shop repairs typically cost between $100 and $700, including parts and labor.
P0221 keeps coming back - why?
P0221 keeps coming back because the root cause was not fully addressed. This often happens if only the sensor was replaced, but the wiring issue, a dirty throttle body, or a deeper electrical problem was overlooked. A thorough diagnosis using live data is essential.
Will P0221 fail emissions/smog test?
Yes, P0221 will cause your vehicle to fail an emissions or smog test. The Check Engine Light being on is an automatic failure in most jurisdictions, and issues with throttle control directly impact engine performance and emissions.
What's the difference between P0221 and P0121?
P0221 refers to a range/performance issue with the 'B' circuit of the throttle/pedal position sensor, while P0121 refers to a similar range/performance issue but with the 'A' circuit. Modern vehicles often have multiple sensors or circuits for redundancy and safety.
P0221 on Toyota Camry?
On many Toyota Camry models, P0221 often points to a failing electronic throttle body assembly or its integrated throttle position sensor. Carbon buildup can also cause issues, so a thorough cleaning of the throttle body is a good first step before considering replacement.
Questions to Ask Your Mechanic
Did you check the live data for the TPS/APPS 'B' sensor for smooth operation across its full range?
Good answer: Yes, I monitored the voltage and percentage readings. They were erratic/flat/spiking, indicating a sensor or wiring issue.
Did you inspect the throttle body for excessive carbon buildup or sticking?
Good answer: Yes, I found significant carbon buildup and cleaned it thoroughly. The throttle plate now moves freely.
Repair Cost Estimate
DIY Repair
Parts only
$30-$400
Shop Repair
Parts + labor
$100-$700
Save $70-$300 by doing it yourself
Difficulty
intermediate
Time
1-2 hours
Intermediate - Requires an OBD-II scan tool with live data capabilities and a multimeter for accurate diagnosis, beyond basic hand tools.
Cost of Waiting
Ignoring P0221 can lead to dangerous driving conditions due to unpredictable throttle response or sudden power loss. A $50-$150 sensor replacement now prevents potential accidents or being stranded.
While You're In There...
If you remove the throttle body for cleaning or replacement, it is good practice to replace the gasket to ensure a proper seal and prevent vacuum leaks.
If you are cleaning the throttle body, cleaning the Mass Air Flow (MAF) sensor at the same time can improve overall engine performance and prevent future air-intake related codes.
Tools You'll Need
- OBD-II Scan Tool with Live Data
- Multimeter
- Basic Socket Set
- Screwdrivers
- Throttle Body Cleaner (if applicable)
P0221 is a common code related to your vehicle's throttle control. While it can be concerning, it is a fixable issue, and addressing it promptly will restore your vehicle's safe and reliable operation.
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Your Next Steps
Step 1: Check for obvious wiring damage or loose connectors at the throttle body and accelerator pedal. Ensure the throttle body is clean and the plate moves freely.
Step 2: If visual inspection doesn't reveal the issue, use an OBD-II scan tool to monitor the live data for the TPS/APPS 'B' sensor. Look for erratic or flat readings as you slowly press the accelerator.
Step 3: If live data confirms an issue with the sensor signal, test the sensor directly with a multimeter. If the sensor is faulty, replace the Throttle Position Sensor or Accelerator Pedal Position Sensor. If the throttle body is integrated, you may need to replace the entire throttle body assembly.