P0227
Fix within a few daysThe engine computer detects a low voltage signal from the 'C' circuit of the throttle position sensor (TPS) or accelerator pedal position (APP) sensor.
Code P0227 means your engine computer detects a low voltage from the accelerator pedal position sensor. Common causes: APP sensor (50%), wiring issues (30%), throttle body (15%). Drivability: Limit driving, fix within a few days. Repair cost: $100-$350 DIY, $200-$700 professional.
Can I Drive With P0227?
No, stop driving
Immediate repair needed
Stop driving immediately if: Any loss of throttle response, engine stalling, or the vehicle entering 'limp mode' (severely reduced power).
Symptoms of P0227
- 1Check Engine Light is on
- 2Reduced engine power or 'limp mode'
- 3Engine hesitates or stalls when accelerating
- 4Erratic or high idle speed
- 5No throttle response when pressing the gas pedal
Common Causes of P0227
Parts most likely causing this code, ranked by probability
The APP sensor sends a signal to the engine computer based on pedal position, and a faulty sensor will send an incorrect low voltage.
50% of P0227 cases are fixed by replacing this part
Damaged, corroded, or loose wiring or connectors to the APP or throttle body can interrupt the signal, causing a low voltage reading.
30% of P0227 cases are fixed by repairing wiring or connectors
If the throttle position sensor is integrated into the throttle body, or if the electronic throttle body motor fails, it can cause this low voltage condition.
15% of P0227 cases are fixed by replacing the throttle body
A rare but possible cause is a faulty engine computer that incorrectly interprets the sensor signal or has an internal fault.
5% of P0227 cases are fixed by replacing the PCM
Check These First (Before Buying Parts)
- Visually inspect the wiring and connectors for the accelerator pedal position sensor and the throttle body for any obvious damage, corrosion, or looseness.
- Clear the code with a scan tool and see if it immediately returns. Sometimes a temporary glitch can trigger the code.
How to Diagnose P0227
- 1Visually inspect the wiring harness and connectors for the accelerator pedal position sensor and the throttle body for any damage, corrosion, or loose connections.
- 2Use an OBD-II scan tool to monitor the live data for the APP sensor 'C' circuit voltage. Compare it to specifications and other APP sensor circuits.
- 3With the ignition on and engine off, use a multimeter to test the voltage at the APP sensor connector and throttle body connector. Look for proper reference voltage and signal voltage changes when the pedal is pressed.
- 4If the sensor voltage is consistently low or erratic, disconnect the sensor and test its internal resistance or voltage output directly.
- 5If all sensor and wiring checks pass, inspect the throttle body for any physical obstructions or sticking, and consider testing the throttle body motor if applicable.
P0227 on Popular Vehicles
Ford F-150
2004-2010These years are known for electronic throttle body failures where the integrated TPS or motor causes P0227. Often results in limp mode.
60% fixed by replacing the throttle body
Honda Accord
2003-2012While less common than Ford, P0227 on these Accords can sometimes be traced to a faulty accelerator pedal position sensor or wiring issues near the pedal assembly.
45% fixed by replacing the APP sensor
Chevrolet Silverado
2007-2013Similar to Ford, GM trucks can experience P0227 due to issues with the electronic throttle body assembly, including the integrated TPS or throttle motor.
55% fixed by replacing the throttle body
Frequently Asked Questions
What does P0227 mean?
P0227 indicates that your vehicle's engine computer has detected a voltage signal from the 'C' circuit of the accelerator pedal position (APP) sensor or throttle position sensor (TPS) that is lower than expected.
Can I drive with P0227?
No, stop driving or limit driving to essential, very short trips. This code often puts the vehicle into 'limp mode' or causes a loss of throttle response, which is unsafe for driving.
Will P0227 clear itself?
No, P0227 will not clear itself. The underlying electrical or sensor fault must be repaired. The Check Engine Light will remain on until the issue is resolved and the code is cleared, or the vehicle completes several drive cycles without the fault.
How do I fix P0227 myself?
Start by inspecting the wiring and connectors for the accelerator pedal position sensor and throttle body. If they look good, you'll likely need to replace the accelerator pedal position sensor. In some cases, the entire throttle body assembly might need replacement if the TPS is integrated.
How much does it cost to fix P0227?
DIY costs range from $100-$350 for an accelerator pedal position sensor or a throttle body. Professional repair costs typically run $200-$700, including parts and labor.
P0227 keeps coming back - why?
If P0227 keeps returning, it means the root cause was not fully addressed. This often points to a persistent wiring issue that was missed, a faulty replacement part, or a less common problem like a failing engine computer (PCM).
Will P0227 fail emissions/smog test?
Yes, P0227 will cause your vehicle to fail an emissions or smog test. Any active Check Engine Light indicates a fault in the emissions system or related components, preventing a pass.
What's the difference between P0227 and P0228?
P0227 indicates a 'low' voltage signal from the 'C' circuit of the TPS/APP sensor, meaning the voltage is too low. P0228 indicates a 'high' voltage signal from the same 'C' circuit, meaning the voltage is too high. Both point to a fault in the sensor or its circuit, but in opposite directions.
P0227 on Ford F-150
On many Ford F-150 models, especially 2004-2010, P0227 often points to a failing electronic throttle body assembly. The internal throttle position sensor or the motor can fail, requiring replacement of the entire throttle body.
Questions to Ask Your Mechanic
Did you check the live data for all APP sensor circuits, not just 'C'?
Good answer: Yes, I monitored all three APP sensor circuits (A, B, and C) and confirmed that circuit C's voltage was consistently low compared to the others and out of specification.
What did you find when you inspected the wiring harness for corrosion or damage?
Good answer: I thoroughly inspected the wiring from the accelerator pedal to the PCM and the throttle body. I didn't find any visible damage, chafing, or corrosion at the connectors.
Repair Cost Estimate
DIY Repair
Parts only
$100-$350
Shop Repair
Parts + labor
$200-$700
Save $100-$350 by doing it yourself
Difficulty
intermediate
Time
1-3 hours
Intermediate - requires a multimeter and an OBD-II scan tool for proper diagnosis, along with basic mechanical skills.
Cost of Waiting
Ignoring P0227 is dangerous. It can cause sudden loss of power or 'limp mode' while driving, creating an unsafe situation. A $100-$350 sensor replacement now prevents potential accidents or being stranded.
While You're In There...
If you are replacing the entire throttle body, a new gasket ensures a proper seal and prevents vacuum leaks.
If you are removing the throttle body, it's a good time to clean any carbon buildup, which can improve idle quality and throttle response.
Tools You'll Need
- OBD-II Scan Tool
- Multimeter
- Basic Socket Set
- Screwdrivers
- Wire Strippers/Crimpers (if repairing wiring)
P0227 is a common electrical or sensor issue. While it can be concerning due to drivability problems, it's a fixable problem, and your vehicle will regain full throttle control afterward.
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Your Next Steps
Step 1: Perform a thorough visual inspection of the wiring and connectors for the accelerator pedal and throttle body. Look for frayed wires, bent pins, or corrosion.
Step 2: Use an OBD-II scan tool to monitor the live data for the APP sensor 'C' circuit. If the voltage is consistently low or erratic, proceed to test the sensor directly.
Step 3: If the sensor tests faulty, replace the accelerator pedal position sensor. If the TPS is integrated into the throttle body, you will need to replace the entire throttle body assembly.