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Engine-Codes – Generic – P1845

P1845 Code - 2-3 Shift Solenoid Circuit Low Input Voltage

Quick Answer

The P1845 code indicates a problem with the 2-3 shift solenoid circuit in the vehicle's transmission. Common causes include Faulty 2-3 shift solenoid, Wiring or connector issues in the shift solenoid circuit, Low transmission fluid levels or dirty fluid. 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
P1845 indicates 2-3 Shift Solenoid Circuit Low Input Voltage.
Common causes
Common causes include Faulty 2-3 shift solenoid, Wiring or connector issues in the shift solenoid circuit, Low transmission fluid levels or dirty fluid.
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 Aug 19, 2024
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Code P1845 Description

The P1845 code indicates a problem with the 2-3 shift solenoid circuit in the vehicle's transmission. The shift solenoid is responsible for controlling the flow of transmission fluid to engage the appropriate gears during shifting. A low input voltage in this circuit can lead to issues with shifting between gears, causing erratic or harsh shifting patterns. This can result in poor performance, decreased fuel efficiency, and potential damage to the transmission if left unaddressed.

OBDII Code P1845 - 2-3 Shift Solenoid Circuit Low Input Voltage
P1845 Code - 2-3 Shift Solenoid Circuit Low Input Voltage

Common Causes of P1845

  1. Faulty 2-3 shift solenoid
  2. Wiring or connector issues in the shift solenoid circuit
  3. Low transmission fluid levels or dirty fluid
  4. Internal transmission problems
  5. Faulty transmission control module

Symptoms of P1845

  1. Erratic or harsh shifting between gears
  2. Delayed or sluggish acceleration
  3. Transmission slipping
  4. Illumination of the check engine light
  5. Overheating of the transmission fluid

How to Fix P1845

  1. Check transmission fluid level and condition, top up or replace if necessary.
  2. Inspect wiring and connectors in the shift solenoid circuit, repair or replace as needed.
  3. Test the 2-3 shift solenoid for proper function, replace if faulty.
  4. Clear the diagnostic trouble codes and test drive the vehicle to ensure the issue has been resolved.
  5. If the problem persists, further diagnostics may be needed to identify any internal transmission issues.

Cost to Fix P1845

The cost of repairing a 2-3 shift solenoid circuit low input voltage issue can vary depending on the specific cause of the problem and the make and model of the vehicle. In general, the cost for parts such as a new shift solenoid can range from $50 to $200, while labor costs can range from $100 to $300. Overall, the total repair cost can range from $150 to $500. It's important to note that these are rough estimates and actual costs may vary based on various factors. It is recommended to consult with a professional mechanic for a more accurate cost estimate.

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Code P1845 Information for Specific Makes

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.

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