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P1847 Buick Code - 2-3 Shift Solenoid Circuit High Input Voltage

Quick Answer

The P1847 Buick code indicates a problem with the 2-3 shift solenoid circuit in the vehicle's transmission system. Common causes include Faulty 2-3 shift solenoid, Wiring issues in the solenoid circuit, Malfunctioning PCM. 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
P1847 Buick indicates 2-3 Shift Solenoid Circuit High Input Voltage.
Common causes
Common causes include Faulty 2-3 shift solenoid, Wiring issues in the solenoid circuit, Malfunctioning PCM.
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 P1847 Buick Description

The P1847 Buick code indicates a problem with the 2-3 shift solenoid circuit in the vehicle's transmission system. The shift solenoid is responsible for controlling the flow of transmission fluid that enables the shifting of gears. When the PCM (Powertrain Control Module) detects a high input voltage in the circuit, it means that the solenoid is receiving more power than it should, which can lead to erratic shifting or a failure to shift gears altogether.

OBDII Code P1847 Buick - 2-3 Shift Solenoid Circuit High Input Voltage
P1847 Buick Code - 2-3 Shift Solenoid Circuit High Input Voltage

Common Causes of P1847 Buick

  1. Faulty 2-3 shift solenoid.
  2. Wiring issues in the solenoid circuit.
  3. Malfunctioning PCM.
  4. Low transmission fluid levels.
  5. Clogged transmission filter.

Symptoms of P1847 Buick

  1. Harsh or delayed shifting between gears.
  2. Transmission slipping or failing to shift.
  3. Check Engine light illuminated on the dashboard.
  4. Reduced fuel efficiency.
  5. Transmission overheating.

How to Fix P1847 Buick

  1. Diagnose the issue by using a scan tool to retrieve the fault codes and inspecting the 2-3 shift solenoid circuit for any visible damage.
  2. Test the 2-3 shift solenoid for proper function by applying power and ground to the solenoid manually.
  3. Inspect the wiring harness for any frayed or damaged wires and repair or replace as necessary.
  4. Check the transmission fluid level and condition, topping up or flushing and replacing if needed.
  5. Clear the fault codes from the PCM and perform a test drive to ensure that the issue has been resolved.

Cost to Fix P1847 Buick

The typical repair costs for addressing a P1847 Buick code can range from $200 to $600, depending on the specific cause of the issue and the extent of the repairs needed. This estimate includes the cost of parts such as a new shift solenoid, wiring harness repairs, and any necessary transmission fluid changes. However, it's important to note that labor rates can vary significantly between auto repair shops, so it's advisable to get quotes from multiple sources to ensure you're getting a fair price for the repairs.

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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 P1847 Buick Code

1. What are the common symptoms of OBDII code P1847 in a Buick related to the 2-3 Shift Solenoid Circuit High Input Voltage?

- Common symptoms include harsh shifting, transmission slipping, delayed or erratic shifting, and possibly the transmission going into failsafe mode.

2. What are the possible causes of OBDII code P1847 in a Buick indicating a high input voltage in the 2-3 Shift Solenoid Circuit?

- Potential causes can include a faulty shift solenoid, damaged wiring or connectors in the circuit, a malfunctioning transmission control module (TCM), or a short circuit.

3. How can I diagnose the issue causing OBDII code P1847 in my Buick?

- Diagnosis typically involves using a scan tool to retrieve the fault code, checking the wiring and connectors for any damage or corrosion, testing the shift solenoid for proper operation, and verifying the TCM's functionality.

4. Are there any specific repair tips for addressing OBDII code P1847 in a Buick related to the 2-3 Shift Solenoid Circuit High Input Voltage?

- Repair tips may include repairing or replacing damaged wiring and connectors, replacing the faulty shift solenoid, resetting the TCM, and clearing the fault code to see if it returns.

5. Can driving with OBDII code P1847 in a Buick be harmful to the vehicle?

- Continuing to drive with this code may lead to further transmission issues, reduced fuel efficiency, and potential damage to other transmission components over time. It is recommended to address the issue promptly.

6. How critical is it to fix OBDII code P1847 in a Buick indicating a high input voltage in the 2-3 Shift Solenoid Circuit?

- Addressing this code is important as it directly affects the transmission's shifting behavior and overall performance. Ignoring the issue can lead to more severe transmission problems and potential safety concerns.

7. Is it possible to reset OBDII code P1847 in a Buick without repairing the underlying issue?

- While clearing the fault code may temporarily turn off the check engine light, the underlying problem causing the code will persist. It is recommended to diagnose and repair the issue to prevent future complications.

8. Can extreme weather conditions or driving habits trigger OBDII code P1847 in a Buick?

- While extreme conditions may exacerbate existing issues, the code is typically triggered by faults within the 2-3 Shift Solenoid Circuit rather than external factors like weather or driving habits.

9. How long does it typically take to repair OBDII code P1847 in a Buick related to the 2-3 Shift Solenoid Circuit High Input Voltage?

- The repair time can vary depending on the exact cause of the issue, availability of parts, and the expertise of the technician. In general, it may take a few hours to a full day to diagnose and fix the problem.

10. Can I drive my Buick with OBDII code P1847 if the transmission is still functioning normally?

- While the vehicle may still be driveable with this code, it is advisable to address the underlying issue promptly to prevent potential transmission damage or safety hazards in the long run.

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