P1891 Chevrolet Code - Throttle Position Sensor PWM Signal Low
Quick Answer
The P1891 code for Chevrolet vehicles indicates a Throttle Position Sensor (TPS) PWM Signal Low. Common causes include Faulty throttle position sensor, Damaged wiring or connectors in the TPS circuit, Corrosion or poor electrical connections. 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
- P1891 Chevrolet indicates Throttle Position Sensor PWM Signal Low.
- Common causes
- Common causes include Faulty throttle position sensor, Damaged wiring or connectors in the TPS circuit, Corrosion or poor electrical connections.
- 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 P1891 Chevrolet Description
The P1891 code for Chevrolet vehicles indicates a Throttle Position Sensor (TPS) PWM Signal Low. This means that the powertrain control module (PCM) has detected a lower than expected voltage signal from the TPS. The TPS is a crucial component that monitors the position of the throttle valve and sends voltage signals to the PCM to adjust fuel delivery and ignition timing accordingly.
Common Causes of P1891 Chevrolet
- Faulty throttle position sensor
- Damaged wiring or connectors in the TPS circuit
- Corrosion or poor electrical connections
- Issues with the PCM or related control modules
- Environmental factors such as moisture or debris affecting the sensor
Symptoms of P1891 Chevrolet
- Engine hesitation during acceleration
- Rough idling or stalling
- Reduced fuel efficiency
- Surging or jerking while driving
- Difficulty starting the vehicle
How to Fix P1891 Chevrolet
- Begin by conducting a thorough inspection of the TPS sensor, wiring, and connectors for any visible damage or corrosion.
- Use a multimeter to test the voltage output of the TPS sensor to determine if it is within the manufacturer's specified range.
- If the TPS sensor is faulty, replace it with a new, OEM-quality sensor.
- Repair or replace any damaged wiring or connectors in the TPS circuit.
- Clear the diagnostic trouble codes from the PCM and perform a test drive to ensure the issue has been resolved.
Cost to Fix P1891 Chevrolet
The cost of repairing a Throttle Position Sensor PWM Signal Low issue can vary depending on the specific cause of the problem and the labor rates in your area. Typically, the cost of a TPS sensor replacement ranges from $50 to $200, depending on the vehicle make and model. Additional costs may include labor charges, which can range from $100 to $300, depending on the shop's hourly rates and the complexity of the repair. It is recommended to get a personalized quote from a trusted auto repair shop to determine the exact cost for your specific situation.
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Frequently Asked Questions about P1891 Chevrolet Code
1. What does the OBDII code P1891 mean on a Chevrolet?
P1891 indicates that the Throttle Position Sensor (TPS) Pulse Width Modulation (PWM) signal is lower than expected, suggesting an issue with the TPS circuit or related components.
2. What are the common symptoms of a P1891 code on a Chevrolet?
Symptoms include reduced engine performance, poor throttle response, hesitation during acceleration, and potentially the illumination of the Check Engine Light.
3. What causes the P1891 code to trigger on a Chevrolet?
Common causes include a malfunctioning throttle position sensor, damaged wiring or connectors in the TPS circuit, or issues with the engine control module (ECM).
4. Can a dirty throttle body cause the P1891 code on a Chevrolet?
Yes, a dirty or clogged throttle body can interfere with the TPS signal and potentially trigger the P1891 code.
5. How can I diagnose a P1891 code on my Chevrolet?
Start by visually inspecting the TPS wiring and connectors for damage. Use a multimeter to test the TPS signal output and check for proper voltage levels. If necessary, scan the ECM for additional codes.
6. Is it safe to drive with the P1891 code on my Chevrolet?
While the car may still be drivable, you could experience poor performance and reduced fuel efficiency. It’s best to address the issue promptly to avoid further damage.
7. How do I fix the P1891 code on a Chevrolet?
Repairs may include replacing the throttle position sensor, repairing or replacing damaged wiring or connectors, cleaning the throttle body, or reprogramming the ECM if necessary.
8. How much does it typically cost to fix the P1891 code on a Chevrolet?
The repair cost can vary but generally ranges from $100 to $300, depending on whether the issue is a faulty TPS, wiring repair, or throttle body cleaning.
9. Can I clear the P1891 code without fixing the issue?
Clearing the code without addressing the root cause will only result in the code returning and may lead to further performance issues.
10. How often should the throttle position sensor be replaced to avoid a P1891 code?
The TPS typically lasts a long time, but it may wear out or fail after 100,000 miles. Regular inspections during maintenance can help identify potential issues early.
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