AutoCodes – Saturn – P1843 Saturn

P1843 Saturn Code - 1-2 Shift Solenoid Circuit High Input Voltage

Quick Answer

With the engine runtime over 5 seconds, system voltage from 8-18v, Fuel Cutoff inactive, 1-2 Shift Solenoid commanded on by the Powertrain Control Module (PCM), the PCM detects a continuous short to power on the 1-2 Shift Solenoid feedback circuit for 4.3 seconds. Common causes include Faulty 1-2 Shift Solenoid, 1-2 Shift Solenoid harness is open or shorted, 1-2 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: P1843 Saturn indicates 1-2 Shift Solenoid Circuit High Input Voltage.
Common causes: Common causes include Faulty 1-2 Shift Solenoid, 1-2 Shift Solenoid harness is open or shorted, 1-2 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 1,653

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 P1843 Saturn Description

OBDII Code P1843 Saturn - 1-2 Shift Solenoid Circuit High Input Voltage - AutoCodes.com — P1843 Saturn Code - 1-2 Shift Solenoid Circuit High Input Voltage

What does this mean?

What are the Possible Causes of the DTC P1843 Saturn?

Faulty 1-2 Shift Solenoid
1-2 Shift Solenoid harness is open or shorted
1-2 Shift Solenoid circuit poor electrical connection

How to Fix the DTC P1843 Saturn?

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 P1843 Saturn 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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Need more information on how to fix the P1843 Saturn code? Get Access to Factory Service Manuals

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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 P1843 Saturn Code

What does the OBDII code P1843 mean for a Saturn?

The P1843 code indicates a problem with the 1-2 shift solenoid circuit, specifically that it is experiencing a high input voltage.

What are the common symptoms of the P1843 code?

Symptoms include harsh or delayed shifting, the transmission being stuck in one gear, reduced fuel efficiency, and an illuminated check engine light.

What causes the P1843 code to appear?

Common causes include a faulty 1-2 shift solenoid, damaged wiring or connectors in the shift solenoid circuit, a malfunctioning transmission control module (TCM), or low transmission fluid levels.

Can I drive my Saturn with the P1843 code?

Driving with this code is not recommended, as it can lead to further transmission damage and unsafe driving conditions.

How do I diagnose the P1843 code?

Diagnosis involves using a scan tool to confirm the code, visually inspecting the wiring and connectors, testing the 1-2 shift solenoid for proper resistance, and checking the TCM for faults.

What tools are needed to fix the P1843 code?

Typical tools include a code scanner, multimeter, wiring diagram for the vehicle, and basic hand tools for accessing transmission components.

How do I fix the P1843 code?

Repairs may include replacing the 1-2 shift solenoid, repairing or replacing damaged wiring or connectors, reprogramming or replacing the TCM, or topping off and inspecting the transmission fluid.

What is the cost to repair the P1843 code?

Repair costs vary widely but can range from $150 to $400 for solenoid replacement, with additional costs if TCM replacement or extensive wiring repairs are required.

Can low transmission fluid cause the P1843 code?

Yes, low or contaminated transmission fluid can affect solenoid operation and trigger the P1843 code.

How can I prevent the P1843 code from recurring?

Regular maintenance, including checking transmission fluid levels and quality, inspecting wiring and connectors, and addressing transmission issues promptly, can help prevent this code.