AutoCodes – Generic – P1841

P1841 Code - Automatic Transmission Fluid Pressure Switch 1

Quick Answer

The Fail-safe function to detect front brake clutch solenoid valve condition. Common causes include Faulty Automatic Transmission Fluid (ATF) Pressure Switch 1, Automatic Transmission Fluid (ATF) Pressure Switch 1 harness is open or shorted, Automatic Transmission Fluid (ATF) Pressure Switch 1 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: P1841 indicates Automatic Transmission Fluid Pressure Switch 1.
Common causes: Common causes include Faulty Automatic Transmission Fluid (ATF) Pressure Switch 1, Automatic Transmission Fluid (ATF) Pressure Switch 1 harness is open or shorted, Automatic Transmission Fluid (ATF) Pressure Switch 1 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.

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Code Popularity 23,934

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 22, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P1841 Description

The Fail-safe function to detect front brake clutch solenoid valve condition. Diagnostic Trouble Code (DTC) P1841 is detected when Transmission Control Module (TCM) detects that actual gear ratio is normal, and relation between gear position and condition of Automatic Transmission Fluid (ATF) Pressure Switch 1 is irregular during depressing accelerator pedal.

OBDII Code P1841 - Automatic Transmission Fluid Pressure Switch 1 - AutoCodes.com — P1841 Code - Automatic Transmission Fluid Pressure Switch 1

What does this mean?

What are the Possible Causes of the DTC P1841?

Faulty Automatic Transmission Fluid (ATF) Pressure Switch 1
Automatic Transmission Fluid (ATF) Pressure Switch 1 harness is open or shorted
Automatic Transmission Fluid (ATF) Pressure Switch 1 circuit poor electrical connection

How to Fix the DTC P1841?

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 P1841 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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Information for Specific Makes

P1841 Buick — Internal Mode Switch 'S' Circuit High Voltage
P1841 Cadillac — Internal Mode Switch 'S' Circuit High Voltage
P1841 Chevrolet — Internal Mode Switch 'S' Circuit High Voltage
P1841 Ford — Transfer Case Shift Motor Short Circuit To Ground
P1841 GMC — Internal Mode Switch 'S' Circuit High Voltage
P1841 Infiniti — Automatic Transmission Fluid Pressure Switch 1
P1841 Nissan — Automatic Transmission Fluid Pressure Switch 1

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.