AutoCodes – Buick – P1845 Buick

P1845 Buick Code - 2-3 Shift Solenoid Circuit Low Input Voltage

Quick Answer

With the engine runtime over 5 seconds, system voltage from 8-1 8v, Fuel Cutoff inactive, the Powertrain Control Module (PCM) detects an open circuit or a short to ground on the 2-3 Shift Solenoid feedback circuit for 4.3 seconds. Common causes include Faulty 2-3 Shift Solenoid, 2-3 Shift Solenoid harness is open or shorted, 2-3 Shift Solenoid 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: P1845 Buick indicates 2-3 Shift Solenoid Circuit Low Input Voltage.
Common causes: Common causes include Faulty 2-3 Shift Solenoid, 2-3 Shift Solenoid harness is open or shorted, 2-3 Shift Solenoid 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 3,380

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Sep 22, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1845 Buick Description

OBDII Code P1845 Buick - 2-3 Shift Solenoid Circuit Low Input Voltage - AutoCodes.com — P1845 Buick Code - 2-3 Shift Solenoid Circuit Low Input Voltage

What does this mean?

What are the Possible Causes of the DTC P1845 Buick?

Faulty 2-3 Shift Solenoid
2-3 Shift Solenoid harness is open or shorted
2-3 Shift Solenoid circuit poor electrical connection

How to Fix the DTC P1845 Buick?

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 P1845 Buick 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 P1845 Buick code?

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Need Help with the Code?

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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.

Frequently Asked Questions about P1845 Buick Code

What does the OBDII code P1845 mean for a Buick?

P1845 indicates a problem with the 2-3 shift solenoid circuit, specifically a low input voltage, which impacts the transmission's ability to shift gears properly.

What are common symptoms of the P1845 code in a Buick?

Symptoms may include erratic or delayed shifting, inability to shift into certain gears, transmission slipping, or the check engine light turning on.

What causes the P1845 code in a Buick?

Common causes include a faulty 2-3 shift solenoid, wiring issues such as damaged or corroded connectors, low transmission fluid, or a malfunctioning transmission control module (TCM).

Can driving with the P1845 code damage my Buick's transmission?

Yes, prolonged driving with this code can lead to increased wear on the transmission or further mechanical damage due to improper shifting.

How is the P1845 code diagnosed in a Buick?

A mechanic typically uses a scan tool to verify the code, inspects the wiring and connectors for damage, checks the transmission fluid level, and tests the functionality of the 2-3 shift solenoid.

How do you fix the P1845 code on a Buick?

Repairs may include replacing the 2-3 shift solenoid, repairing or replacing damaged wiring, cleaning corroded connectors, refilling or replacing transmission fluid, or addressing issues with the TCM.

Can low transmission fluid trigger the P1845 code in a Buick?

Yes, low or contaminated transmission fluid can cause inadequate pressure, which may contribute to solenoid circuit issues and trigger the P1845 code.

How much does it cost to repair the P1845 code in a Buick?

Repair costs vary but typically range from $200 to $600 depending on whether the solenoid, wiring, or TCM needs replacement.

Is the P1845 code specific to Buick vehicles?

No, while P1845 is common in certain Buick models, it can also appear in other vehicles with similar transmission systems.

Can I fix the P1845 code on my Buick myself?

If you have mechanical knowledge, you might be able to inspect wiring, connectors, or replace the solenoid. However, complex diagnostics and repairs should be handled by a professional.