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

Quick Answer

The P1842 Pontiac code refers to a 1-2 Shift Solenoid Circuit Low Input Voltage. Common causes include Faulty wiring or connections, Defective 1-2 shift solenoid, Malfunctioning transmission control module (TCM). 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 wiring or connections, Defective 1-2 shift solenoid, Malfunctioning transmission control module (TCM).
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 09, 2024
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Code P1842 Pontiac Description

The P1842 Pontiac code refers to a 1-2 Shift Solenoid Circuit Low Input Voltage. This indicates that there is an issue with the electrical circuit that controls the 1-2 shift solenoid in the transmission. The shift solenoid is responsible for directing transmission fluid flow to engage the correct gear for smooth shifting. When the input voltage to the solenoid is low, it can lead to improper shifting, harsh shifting, or even transmission slipping.

OBDII Code P1842 Pontiac - 1-2 Shift Solenoid Circuit Low Input Voltage
P1842 Pontiac Code - 1-2 Shift Solenoid Circuit Low Input Voltage

Common Causes of P1842 Pontiac

  1. Faulty wiring or connections
  2. Defective 1-2 shift solenoid
  3. Malfunctioning transmission control module (TCM)
  4. Low battery voltage
  5. Corrosion or damage to electrical components

Symptoms of P1842 Pontiac

  1. Harsh or delayed shifting
  2. Transmission slipping
  3. Inability to shift gears
  4. Check engine light illuminated
  5. Reduced fuel efficiency

How to Fix P1842 Pontiac

  1. Diagnose the issue by performing a thorough inspection of the wiring, connections, shift solenoid, and TCM.
  2. Test the voltage at the shift solenoid to determine if it is within the correct range.
  3. Replace any damaged wiring or connectors.
  4. Replace the 1-2 shift solenoid if it is found to be faulty.
  5. Clear the diagnostic trouble codes and test drive the vehicle to ensure proper shifting functionality.

Cost to Fix P1842 Pontiac

The typical repair costs for addressing a P1842 Pontiac code can vary depending on the specific cause of the issue and the labor rates in your area. Generally, replacing a shift solenoid can cost between $150 to $300, while diagnosing and repairing wiring issues or replacing the TCM can increase the cost further. Overall, you can expect to pay between $200 to $500 for parts and labor to resolve this issue. However, it's recommended to obtain quotes from local auto repair shops to get a more accurate estimate based on your vehicle's make and model. Labor rates can range from $80 to $150 per hour, so it's essential to consider these factors when budgeting for this repair.

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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.

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