AutoCodes – Buick – P1842 Buick

P1842 Buick Code - 1-2 Shift Solenoid Circuit Low Input Voltage

Quick Answer

With the engine runtime over 5 seconds, system voltage from 8-18v, Fuel Cutoff inactive, the Powertrain Control Module (PCM) detects an open circuit or a short to ground 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: P1842 Buick indicates 1-2 Shift Solenoid Circuit Low 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 3,177

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 P1842 Buick Description

OBDII Code P1842 Buick - 1-2 Shift Solenoid Circuit Low Input Voltage - AutoCodes.com — P1842 Buick Code - 1-2 Shift Solenoid Circuit Low Input Voltage

What does this mean?

What are the Possible Causes of the DTC P1842 Buick?

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 P1842 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 P1842 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 P1842 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 P1842 Buick Code

1. What are the common symptoms of OBDII code P1842 in a Buick related to the 1-2 Shift Solenoid Circuit Low Input Voltage?

- Common symptoms include harsh or delayed shifting, erratic transmission behavior, and potential illumination of the Check Engine Light.

2. What are some possible causes of the 1-2 Shift Solenoid Circuit Low Input Voltage code in a Buick?

- Causes may include a faulty shift solenoid, damaged wiring or connectors in the circuit, low transmission fluid level, or a malfunctioning transmission control module.

3. How can I diagnose the 1-2 Shift Solenoid Circuit Low Input Voltage issue in my Buick?

- Diagnosis typically involves using an OBDII scanner to retrieve the specific trouble code, conducting a visual inspection of the wiring and connectors, testing the shift solenoid for proper operation, and checking the transmission fluid level.

4. Is it safe to continue driving my Buick with OBDII code P1842 present?

- It is not recommended to drive your vehicle with this code present, as it can lead to further damage to the transmission and potentially result in unsafe driving conditions.

5. Can I repair the 1-2 Shift Solenoid Circuit Low Input Voltage issue in my Buick myself?

- Depending on your level of automotive repair experience, you may be able to address the issue yourself by replacing the faulty shift solenoid, repairing damaged wiring, or addressing other potential causes. However, professional diagnosis and repair may be necessary in some cases.

6. Will resetting the Check Engine Light make the P1842 code go away permanently?

- Resetting the Check Engine Light without addressing the underlying issue will not permanently resolve the P1842 code. The problem causing the code needs to be identified and fixed to prevent its recurrence.

7. How much does it typically cost to repair OBDII code P1842 related to the 1-2 Shift Solenoid Circuit Low Input Voltage in a Buick?

- The cost of repair can vary depending on the specific cause of the issue, parts needed for replacement, and labor costs. It is advisable to obtain quotes from reputable repair shops for an accurate estimate.

8. Can a low transmission fluid level trigger the P1842 code in a Buick?

- Yes, a low transmission fluid level can potentially trigger the 1-2 Shift Solenoid Circuit Low Input Voltage code by causing inadequate hydraulic pressure for proper solenoid operation. It is important to check and maintain the proper fluid level in the transmission.

9. How urgent is it to address the OBDII code P1842 in a Buick?

- It is recommended to address the P1842 code promptly to prevent further transmission damage and ensure safe and reliable vehicle operation. Ignoring the issue can lead to more severe problems over time.

10. Are there any preventive maintenance steps I can take to avoid encountering the P1842 code in my Buick?

- Regularly servicing your vehicle, including checking and maintaining proper transmission fluid levels, can help prevent issues that may trigger the P1842 code related to the 1-2 Shift Solenoid Circuit Low Input Voltage.