What’s hiding behind that mysterious Check Engine Light? If your car’s computer has flagged a P0122 code, it’s trying to tell you that the Throttle Position Sensor (TPS) 1 circuit is outputting low voltage. This sensor is responsible for monitoring the throttle valve’s position, which affects fuel delivery and ignition timing. With this code, you may notice poor acceleration, rough idling, and decreased fuel efficiency. But what’s causing this issue, and how can you get your engine running smoothly again?
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Key Takeaways
- The P0122 code indicates a low voltage output from the Throttle Position Sensor (TPS) 1 circuit, affecting engine performance and fuel efficiency.
- A faulty TPS sensor, damaged wiring, or electrical issues can cause the P0122 code, triggering the Check Engine Light.
- Symptoms include poor acceleration, rough idling, and decreased fuel efficiency, requiring prompt diagnosis and repair to avoid further damage.
- Diagnosis involves inspecting the TPS sensor and wiring, testing voltage output, and resetting the Engine Control Module (ECM) if necessary.
- Repair costs can range from $100 to $300, depending on the vehicle, location, and extent of the issue, with luxury vehicles potentially requiring more expensive parts and labor.
Code P0122 Description
When your vehicle’s onboard computer, the Engine Control Module (ECM), detects a problem with the Throttle Position Sensor (TPS) 1 circuit, it triggers the P0122 trouble code.
The TPS monitors the throttle valve’s position, sending this data to the ECM for fuel delivery and ignition timing optimization. As a critical sensor function, the TPS enables accurate throttle analysis.
A low voltage output from the TPS sensor, below the specified range, causes the P0122 code to be triggered. This code indicates a problem with the TPS 1 circuit, which can affect your vehicle’s engine performance.
Common Causes of P0122
Faulty components and electrical issues are common culprits behind the P0122 code.
When you’re dealing with this trouble code, it’s essential to identify the root cause to guarantee proper repairs.
Three common causes to ponder are:
- Faulty electronics: A faulty Throttle Position Sensor (TPS) can cause the P0122 code. The sensor may be malfunctioning or providing incorrect voltage readings, leading to issues with sensor calibration.
- Damaged wiring or connectors: Corrosion or damage to the TPS circuit wiring or connectors can also trigger the P0122 code.
- ECM or related component issues: Problems with the Engine Control Module (ECM) or other related components can also cause the P0122 code.
Symptoms of P0122
If your vehicle is experiencing issues with the Throttle Position Sensor (TPS) 1 Circuit, you may notice some distinct symptoms.
You might feel a lack of response when pressing the gas pedal, resulting in poor acceleration. The engine may idle rough or stall at stops, and its performance may be inconsistent.
You may also notice a decrease in fuel efficiency, which can lead to increased fuel costs. The Check Engine Light will likely be illuminated on your dashboard, indicating a problem.
These symptoms can significantly impact your vehicle’s overall engine performance, making it essential to address the issue promptly.
How to Fix P0122
To fix the P0122 code, start by diagnosing the issue using a scan tool to confirm the code and identify the specific cause.
This will help you determine if the problem lies with the Throttle Position Sensor (TPS), wiring, or another component.
Next, perform the following steps:
- Inspect the TPS sensor, wiring, and connectors for any visible damage or corrosion, and address any issues you find.
- Test the TPS sensor’s voltage output using a multimeter to verify it falls within the manufacturer’s specified range, as voltage fluctuations can cause the code to trigger.
- Reset the ECM and clear the trouble code from the system to see if the issue persists, and consider replacing the TPS sensor or seeking professional assistance if necessary.
Diagnosing the Issue
When diagnosing the issue behind the P0122 code, your first step is to connect a scan tool to the vehicle’s onboard diagnostics (OBD-II) system to retrieve the trouble code and freeze frame data.
This will give you a better understanding of the problem and help you identify the root cause. Using diagnostic software, you can analyze the data and review the engine’s operating conditions when the code was triggered.
This information will help you narrow down the possible causes and create a plan for further diagnosis and repair.
Inspecting the TPS Sensor and Wiring
What’s the condition of your Throttle Position Sensor (TPS) and its wiring?
Inspecting the TPS sensor and wiring is a vital step in diagnosing the P0122 code.
1. Sensor Cleaning: Check the TPS sensor for any dirt, grime, or corrosion that may be affecting its performance.
Clean the sensor with a soft brush and gentle cleaning solution to remove any debris.
2. Wire Inspection: Inspect the wiring and connectors for any signs of damage, corrosion, or wear.
Check for frayed wires, loose connections, or broken pins that may be causing the low voltage reading.
3. Connector Examination: Examine the TPS sensor connectors for any signs of corrosion, wear, or looseness.
Make sure they’re securely connected and not damaged in any way.
Inspecting the TPS sensor and wiring is a key step in diagnosing the P0122 code.
Testing the TPS Sensor Voltage Output
You’ve completed the visual inspection of the TPS sensor and wiring, and now it’s time to take a closer look at the sensor’s voltage output. Using a multimeter, connect the leads to the TPS sensor’s voltage output wire and ground. Take note of the voltage reading and compare it to the manufacturer’s specified range. If the reading is lower than expected, it may indicate sensor failure or voltage fluctuations.
| Voltage Reading | Diagnosis |
|---|---|
| Below 0.5V | Sensor failure or wiring issue |
| 0.5V – 4.5V | Normal operation |
| Above 4.5V | Voltage fluctuations or sensor malfunction |
| Fluctuating | Intermittent sensor failure or wiring issue |
Cost to Fix P0122 and Additional Information
The typical repair costs for addressing a P0122 code can range from $100 to $300, depending on the extent of the issue and the rates of individual auto repair shops.
You’ll need to factor in the cost of parts, such as a new TPS sensor, and potential labor charges for diagnosis and repair.
Some key cost factors to weigh:
- Location: Repair shops in urban areas may charge more than those in rural areas.
- Vehicle make and model: Luxury vehicles may require more expensive parts and labor.
- Extent of the issue: If the problem is complex, you may need to pay for additional diagnostic tests or repairs.
More OBD-II Codes
| P0123 | P0131 | P0132 | P0133 |
| P0137 | P0138 | P0140 | P0172 |
| P0220 | P0222 | P0223 | P0261 |
| P0262 | P0264 | P0265 | P0267 |
| P0268 | P0462 | P0463 | P0480 |
| P0481 | P0629 | P1199 | P1504 |
Frequently Asked Questions
Can I Drive My Car With a P0122 Code?
You can drive your car with a P0122 code, but be aware of potential driving risks, such as poor acceleration and inconsistent engine performance, which may affect fuel efficiency and overall safety; it’s recommended to address the issue as soon as possible.
Will a P0122 Code Cause My Car to Fail an Emissions Test?
When you’re driving with a faulty throttle position sensor, your vehicle’s performance suffers, which can lead to increased emissions, potentially causing you to fail an emissions test, as it can’t meet emissions standards due to poor engine performance.
Is It Possible to Repair a Faulty TPS Sensor or Must It Be Replaced?
“An ounce of prevention is worth a pound of cure” – when dealing with a faulty TPS sensor, you’re likely wondering if it can be repaired. While it’s possible to try sensor cleaning or calibration adjustment, often replacement is the most effective solution to guarantee accurate throttle position data.
Can a P0122 Code Be Caused by Low Battery Voltage?
You’re wondering if low battery voltage can cause a P0122 code. Yes, it’s possible; voltage fluctuations can impact the Throttle Position Sensor’s performance, and poor battery health can lead to low voltage output, triggering the code.
Will a P0122 Code Reset Itself if the Issue Is Intermittent?
You might be wondering if an intermittent glitch will cause the code to reset itself. Unfortunately, it’s unlikely, as the issue needs to be consistently resolved for the code to clear; try sensor cleaning or further diagnosis to identify the root cause.
Conclusion
You’ve finally reached the finish line in diagnosing and fixing the P0122 code! Like a well-tuned engine, your persistence has paid off, and you’re now ready to hit the road with a smooth-running vehicle. Remember, a healthy TPS sensor is the spark that ignites peak engine performance. By following these steps, you’ve guaranteed your ride is firing on all cylinders, and you can drive away with confidence, leaving the P0122 code in the dust.
