P1239 Infiniti Code - Throttle Position Sensor Circuit Range/Performance
Quick Answer
The P1239 code in Infiniti vehicles indicates an issue with the Throttle Position Sensor (TPS) circuit's range or performance. Common causes include TPS sensor wear: Over time, the TPS sensor can wear out or develop internal faults, leading to inaccurate readings, Wiring issues: Corrosion, damage, or loose connections in the wiring harness connected to the TPS can cause circuit range/performance problems, ECM malfunction: A faulty ECM can also contribute to TPS circuit issues, as it may not be able to interpret the sensor's signals correctly. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P1239 Infiniti indicates Throttle Position Sensor Circuit Range/Performance.
- Common causes
- Common causes include TPS sensor wear: Over time, the TPS sensor can wear out or develop internal faults, leading to inaccurate readings, Wiring issues: Corrosion, damage, or loose connections in the wiring harness connected to the TPS can cause circuit range/performance problems, ECM malfunction: A faulty ECM can also contribute to TPS circuit issues, as it may not be able to interpret the sensor's signals correctly.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
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Code P1239 Infiniti Description
The P1239 code in Infiniti vehicles indicates an issue with the Throttle Position Sensor (TPS) circuit's range or performance. The TPS is a crucial component of the vehicle's fuel injection system, as it communicates with the engine control module (ECM) to determine the appropriate fuel delivery based on the driver's throttle input. When the TPS circuit is not functioning correctly, it can lead to a range of performance issues that affect the vehicle's drivability and fuel efficiency.
Common Causes of P1239 Infiniti
- TPS sensor wear: Over time, the TPS sensor can wear out or develop internal faults, leading to inaccurate readings.
- Wiring issues: Corrosion, damage, or loose connections in the wiring harness connected to the TPS can cause circuit range/performance problems.
- ECM malfunction: A faulty ECM can also contribute to TPS circuit issues, as it may not be able to interpret the sensor's signals correctly.
- Throttle body issues: If the throttle body is dirty or malfunctioning, it can affect the TPS's performance and accuracy.
Symptoms of P1239 Infiniti
- Poor acceleration: A faulty TPS can cause delays in throttle response, leading to sluggish acceleration.
- Rough idling: The engine may idle erratically or stall due to incorrect fuel delivery.
- Reduced fuel efficiency: Incorrect fuel delivery can result in decreased fuel efficiency, leading to more frequent visits to the gas station.
- Check Engine Light: The illumination of the Check Engine Light is a common symptom of TPS-related issues.
How to Fix P1239 Infiniti
- Diagnose the issue: Use a diagnostic scanner to retrieve the trouble codes and perform a thorough inspection of the TPS and its wiring.
- Replace the TPS: If the TPS sensor is faulty, replace it with a new one according to the manufacturer's specifications.
- Check wiring: Inspect the wiring harness for any damage, corrosion, or loose connections, and repair or replace as necessary.
- Reset ECM: Clear the trouble codes and reset the ECM to ensure it can relearn the new TPS sensor's parameters.
- Test drive: After the repair, test drive the vehicle to ensure that the TPS circuit range/performance issue has been resolved.
Cost to Fix P1239 Infiniti
The cost of repairing a Throttle Position Sensor circuit range/performance issue in an Infiniti vehicle can vary depending on the specific model and year of the vehicle, as well as the location and labor rates of the auto repair shop. On average, replacing a TPS sensor can cost between $100 and $300, including parts and labor. Additional costs may apply if wiring repairs or ECM replacement are necessary. It's recommended to obtain quotes from local auto repair shops to get a more accurate estimate for this repair. Labor rates typically range from $80 to $150 per hour, with dealership rates and metropolitan area rates potentially higher.
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