AutoCodes – Honda – P1891 Honda

P1891 Honda Code - Problem in Start Clutch System

Quick Answer

The start clutch control system controls the clutch piston hydraulic pressure which affects the amount of power transmission by the multiplate wet start clutch on the driven pulley shaft. Common causes include Faulty CVT Speed Sensor, CVT Speed Sensor harness is open or shorted, CVT Speed 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 Honda indicates Problem in Start Clutch System.
Common causes: Common causes include Faulty CVT Speed Sensor, CVT Speed Sensor harness is open or shorted, CVT Speed 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 10,504

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 26, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P1891 Honda Description

The start clutch control system controls the clutch piston hydraulic pressure which affects the amount of power transmission by the multiplate wet start clutch on the driven pulley shaft. The Transmission Control Module (TCM) activates the CVT start clutch pressure control solenoid to control the hydraulic pressure that is applied to the start clutch piston in accordance with vehicle conditions. The start clutch control system detects the overslip of the clutch. If the difference between the vehicle speed measured by the driven pulley speed sensor and one measured by the CVT speed sensor is excessive when driving the vehicle under Enable Conditions, a malfunction, excessive clutch slippage is detected and a DTC is stored.

OBDII Code P1891 Honda - Problem in Start Clutch System - AutoCodes.com — P1891 Honda Code - Problem in Start Clutch System

What does this mean?

What are the Possible Causes of the DTC P1891 Honda?

Faulty CVT Speed Sensor
CVT Speed Sensor harness is open or shorted
CVT Speed Sensor circuit poor electrical connection
Faulty Driven Pulley Speed Sensor
Driven Pulley Speed Sensor harness is open or shorted
Driven Pulley Speed Sensor circuit poor electrical connection

How to Fix the DTC P1891 Honda?

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 Honda 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.

Need more information about the P1891 Honda code?

Need more information on how to fix the P1891 Honda code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1891 Honda code diagnosed by a professional: Find a repair shop in your area

Information for Specific Honda Models

P1891 1996 Honda Civic — Problem in Start Clutch System
P1891 1997 Honda Civic — Problem in Start Clutch System
P1891 1998 Honda Civic — Problem in Start Clutch System
P1891 1999 Honda Civic — Problem in Start Clutch System
P1891 2000 Honda Civic — Problem in Start Clutch System

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.

Frequently Asked Questions about P1891 Honda Code

1. What does the OBDII code P1891 mean on a Honda?

P1891 indicates a problem in the start clutch system, which is responsible for transmitting power from the engine to the transmission during initial acceleration.

2. What are the common symptoms of the P1891 code on a Honda?

Symptoms may include poor acceleration, delayed or rough shifting, slipping during takeoff, and the Check Engine Light or transmission warning light turning on.

3. What causes the P1891 code to appear?

Common causes include a malfunctioning start clutch solenoid, worn-out start clutch components, low or contaminated transmission fluid, or issues with the transmission control module (TCM).

4. Can I drive my Honda with the P1891 code?

It's not advisable to continue driving with this code active, as it can lead to further damage to the transmission and reduced vehicle performance.

5. How do you diagnose the P1891 code on a Honda?

Diagnosis typically involves scanning for additional trouble codes, inspecting the transmission fluid condition, testing the start clutch solenoid, and checking wiring connections to the TCM.

6. What repairs can fix the P1891 code?

Repairs may include replacing the start clutch solenoid, repairing or replacing the start clutch, flushing and replacing the transmission fluid, or updating/replacing the TCM if necessary.

7. How much does it cost to fix the P1891 code on a Honda?

Repair costs can vary, but they typically range from $200 to $1,500 depending on the specific issue, such as solenoid replacement or more extensive transmission repairs.

8. Can low transmission fluid cause the P1891 code?

Yes, low or contaminated transmission fluid can cause improper clutch engagement, leading to the P1891 code.

9. Does the P1891 code require transmission replacement?

Not always. In some cases, repairing or replacing the start clutch or solenoid can resolve the issue without needing a full transmission replacement.

10. How can I prevent the P1891 code from recurring?

Regularly maintain your transmission by changing the fluid as recommended, addressing shifting issues promptly, and ensuring solenoid and electrical connections are in good condition.