AutoCodes – Pontiac – P1842 Pontiac

P1842 Pontiac 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 Pontiac 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 1,205

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 Pontiac Description

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

What does this mean?

What are the Possible Causes of the DTC P1842 Pontiac?

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 Pontiac?

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 Pontiac 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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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 Pontiac Code

1. What does the P1842 code mean on a Pontiac?

The P1842 code indicates a low input voltage in the 1-2 shift solenoid circuit, which can affect transmission shifting.

2. What are the common symptoms of the P1842 code?

Symptoms may include harsh or delayed shifting, inability to shift between gears, transmission stuck in one gear, and the check engine light being illuminated.

3. What causes the P1842 code to appear?

Common causes include a faulty 1-2 shift solenoid, damaged wiring or connectors in the solenoid circuit, low transmission fluid, or issues with the powertrain control module (PCM).

4. Can low transmission fluid cause the P1842 code?

Yes, low or dirty transmission fluid can lead to improper solenoid operation and trigger the P1842 code.

5. How can I diagnose the P1842 code on my Pontiac?

Start by checking the transmission fluid level and condition, inspecting the wiring and connectors for damage, and testing the 1-2 shift solenoid for functionality.

6. Is it safe to drive with the P1842 code active?

Driving with this code may cause further transmission damage or unsafe driving conditions due to improper shifting. It's best to address the issue promptly.

7. How do I fix the P1842 code?

Repairs may involve replacing the 1-2 shift solenoid, repairing damaged wiring or connectors, topping off or changing the transmission fluid, or reprogramming the PCM if needed.

8. How much does it cost to repair the P1842 code?

The cost varies depending on the repair needed. Replacing a shift solenoid typically costs $150 to $400, while wiring repairs may cost less.

9. Can a faulty PCM trigger the P1842 code?

Although rare, a malfunctioning PCM or incorrect programming can potentially cause this code.

10. How do I prevent the P1842 code from recurring?

Regularly maintain your transmission system by checking fluid levels, replacing fluid as needed, and inspecting wiring and connectors for wear or damage.