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Engine-Codes – GMC – P0801 GMC

P0801 GMC Code - Reverse Inhibit Solenoid Control Circuit

Quick Answer

The P0801 code for GMC vehicles indicates a problem with the Reverse Inhibit Solenoid Control Circuit. Common causes include Faulty Reverse Inhibit Solenoid, Wiring or connection issues in the solenoid control circuit, Low transmission fluid level. 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
P0801 GMC indicates Reverse Inhibit Solenoid Control Circuit.
Common causes
Common causes include Faulty Reverse Inhibit Solenoid, Wiring or connection issues in the solenoid control circuit, Low transmission fluid level.
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 11, 2024
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Code P0801 GMC Description

The P0801 code for GMC vehicles indicates a problem with the Reverse Inhibit Solenoid Control Circuit. The Reverse Inhibit Solenoid is responsible for controlling the engagement of reverse gear in the transmission. When this circuit malfunctions, it can lead to issues with shifting into reverse or staying in reverse gear. This can result in difficulty or inability to engage reverse gear, which can be a major safety concern.

OBDII Code P0801 GMC - Reverse Inhibit Solenoid Control Circuit
P0801 GMC Code - Reverse Inhibit Solenoid Control Circuit

Common Causes of P0801 GMC

  1. Faulty Reverse Inhibit Solenoid
  2. Wiring or connection issues in the solenoid control circuit
  3. Low transmission fluid level
  4. Transmission control module malfunction
  5. Electrical issues such as blown fuses or relays

Symptoms of P0801 GMC

  1. Difficulty shifting into reverse gear
  2. Vehicle hesitates or jerks when engaging reverse
  3. Inability to move in reverse
  4. Check Engine Light illuminated on the dashboard

How to Fix P0801 GMC

  1. Diagnose the issue by connecting a scan tool to retrieve the trouble code and inspecting the Reverse Inhibit Solenoid and its wiring.
  2. Check the transmission fluid level and condition. Top up or replace the fluid if necessary.
  3. Test the Reverse Inhibit Solenoid for proper function and replace if faulty.
  4. Inspect the wiring and connections in the solenoid control circuit for any damage or corrosion. Repair or replace as needed.
  5. Clear the trouble code from the vehicle's computer and test drive to ensure the issue has been resolved.

Cost to Fix P0801 GMC

The cost of repairing a P0801 code for a GMC vehicle can vary depending on the specific cause of the issue. On average, the repair cost for this type of problem can range from $150 to $500. This estimate includes the cost of parts such as a new Reverse Inhibit Solenoid, transmission fluid, and any necessary wiring repairs. Labor costs can also vary, with rates typically ranging from $80 to $150 per hour. It is recommended to consult with a professional mechanic for a more accurate cost estimate based on your specific vehicle and location.

When is the Code Detected?

When the Reverse Inhibit solenoid energizes, the operator can shift the transmission into reverse. The Powertrain Control Module (PCM) enables the Reverse Inhibit solenoid whenever vehicle speed is below 5 mph. When the vehicle speed is above 5 mph, the PCM de-energizes the solenoid, which prevents the operator from shifting the transmission into reverse.

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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.

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