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P0891 Chrysler Code - TCM Power Relay Sense Circuit High

Quick Answer

The P0891 Chrysler diagnostic trouble code (DTC) refers to the Transmission Control Module (TCM) Power Relay Sense Circuit High. Common causes include Faulty power relay: The power relay responsible for supplying power to the TCM may be faulty, causing a high voltage signal to be sent to the TCM, Wiring issues: Damaged or corroded wiring connections between the power relay and the TCM can result in high voltage readings, TCM failure: A malfunctioning TCM itself can sometimes trigger this code if it misinterprets signals from the power relay sense circuit. 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
P0891 Chrysler indicates TCM Power Relay Sense Circuit High.
Common causes
Common causes include Faulty power relay: The power relay responsible for supplying power to the TCM may be faulty, causing a high voltage signal to be sent to the TCM, Wiring issues: Damaged or corroded wiring connections between the power relay and the TCM can result in high voltage readings, TCM failure: A malfunctioning TCM itself can sometimes trigger this code if it misinterprets signals from the power relay sense circuit.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 11, 2024
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Code P0891 Chrysler Description

The P0891 Chrysler diagnostic trouble code (DTC) refers to the Transmission Control Module (TCM) Power Relay Sense Circuit High. This code is set when the TCM detects a high voltage signal from the power relay sense circuit, indicating an issue with the power relay or its related components. The TCM is responsible for controlling and coordinating the transmission's operation, including gear shifting, torque converter lockup, and other functions. The power relay plays a crucial role in supplying power to the TCM, and when a high voltage signal is detected, it can disrupt the TCM's ability to function properly.

OBDII Code P0891 Chrysler - TCM Power Relay Sense Circuit High
P0891 Chrysler Code - TCM Power Relay Sense Circuit High

Common Causes of P0891 Chrysler

  1. Faulty power relay: The power relay responsible for supplying power to the TCM may be faulty, causing a high voltage signal to be sent to the TCM.
  2. Wiring issues: Damaged or corroded wiring connections between the power relay and the TCM can result in high voltage readings.
  3. TCM failure: A malfunctioning TCM itself can sometimes trigger this code if it misinterprets signals from the power relay sense circuit.
  4. Poor electrical connections: Loose or poor electrical connections within the circuit can lead to voltage spikes and trigger the code.
  5. Water damage: Water infiltration into the TCM or power relay can cause electrical issues and trigger high voltage readings.

Symptoms of P0891 Chrysler

  1. Harsh or erratic shifting: The TCM may struggle to control the transmission's shifting patterns, resulting in harsh or erratic gear changes.
  2. Transmission slipping: The transmission may slip, making it difficult to accelerate smoothly or maintain speed.
  3. Engine stalling: The engine may stall unexpectedly, especially when coming to a stop or shifting gears.
  4. Reduced fuel efficiency: A malfunctioning TCM can lead to decreased fuel efficiency as the transmission fails to operate optimally.
  5. Illuminated warning light: The vehicle's check engine light may illuminate to indicate a problem with the transmission system.

How to Fix P0891 Chrysler

  1. Diagnose the issue: Use a diagnostic scan tool to retrieve the trouble codes and perform further testing to pinpoint the exact cause of the high voltage signal.
  2. Inspect wiring and connections: Check the wiring harness and connections between the power relay and TCM for any damage, corrosion, or loose connections.
  3. Test the power relay: Test the power relay to ensure it is functioning correctly. Replace it if necessary.
  4. Check TCM operation: Verify the TCM's operation and functionality to ensure it is not causing the issue.
  5. Clear codes and test drive: Clear the trouble codes after making repairs and test drive the vehicle to confirm the issue has been resolved.

Cost to Fix P0891 Chrysler

The cost of repairing a P0891 Chrysler code can vary depending on the specific cause of the issue and the labor rates in your area. On average, you can expect to pay between $150 to $400 for parts and labor. Keep in mind that labor rates can vary significantly, and additional diagnostic time may be needed to accurately diagnose and repair the problem. It's recommended to consult with a professional mechanic to get an accurate estimate for your specific vehicle.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

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