P1891 Chevrolet Code - Throttle Position Sensor PWM Signal Low
Quick Answer
P1891 Chevrolet indicates Throttle Position Sensor PWM Signal Low. Common causes include Faulty Throttle Position Sensor, Throttle Position Sensor harness is open or shorted, Throttle Position Sensor circuit poor electrical connection. 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, Throttle Position Sensor harness is open or shorted, Throttle Position Sensor circuit poor electrical connection.
- 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.
Code P1891 Chevrolet Description
What are the Possible Causes of the DTC P1891 Chevrolet?
- Faulty Throttle Position Sensor
- Throttle Position Sensor harness is open or shorted
- Throttle Position Sensor circuit poor electrical connection
How to Fix the DTC P1891 Chevrolet?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1891 Chevrolet code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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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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