AutoCodes – Hummer – P0801 Hummer

P0801 Hummer Code - Reverse Inhibit Solenoid Control Circuit

Quick Answer

An ignition voltage is supplied to the Reverse Inhibit solenoid. Common causes include Faulty Reverse Inhibit Solenoid, Reverse Inhibit Solenoid harness is open or shorted, Reverse Inhibit 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: P0801 Hummer indicates Reverse Inhibit Solenoid Control Circuit.
Common causes: Common causes include Faulty Reverse Inhibit Solenoid, Reverse Inhibit Solenoid harness is open or shorted, Reverse Inhibit 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 3,290

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 08, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0801 Hummer Description

An ignition voltage is supplied to the Reverse Inhibit solenoid. The Powertrain Control Module (PCM) controls the solenoid by grounding the control circuit via an internal switch called a driver. The driver supplies the ground for the component being controlled. Each driver has a fault line which the PCM monitors. When the PCM commands a component ON, the voltage of the control circuit should be low (near 0 volts). When the PCM commands the control circuit to a component OFF, the voltage potential of the circuit should be high (near battery voltage). If the fault detection circuit senses a voltage other than what is expected, the fault line status changes causing the P0801 code to set.

OBDII Code P0801 Hummer - Reverse Inhibit Solenoid Control Circuit - AutoCodes.com — P0801 Hummer Code - Reverse Inhibit Solenoid Control Circuit

What does this mean?

What are the Possible Causes of the DTC P0801 Hummer?

Faulty Reverse Inhibit Solenoid
Reverse Inhibit Solenoid harness is open or shorted
Reverse Inhibit Solenoid circuit poor electrical connection

How to Fix the DTC P0801 Hummer?

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 P0801 Hummer 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 P0801 Hummer Code

1. What are the common symptoms of OBDII code P0801 in a Hummer?

- Common symptoms include difficulty shifting gears, erratic shifting behavior, and the vehicle not going into reverse.

2. What does the OBDII code P0801 in a Hummer indicate?

- This code indicates a problem with the Reverse Inhibit Solenoid Control Circuit.

3. What are the possible causes of OBDII code P0801 in a Hummer?

- Possible causes include a faulty reverse inhibit solenoid, damaged wiring or connectors in the circuit, or a problem with the transmission control module.

4. How can I diagnose the issue causing OBDII code P0801 in my Hummer?

- A thorough inspection of the reverse inhibit solenoid, checking the wiring and connectors for damage, and testing the transmission control module can help diagnose the issue.

5. Can I still drive my Hummer with OBDII code P0801 present?

- It is not recommended to drive your vehicle with this code present, as it can lead to further transmission issues and potential safety risks.

6. How can I fix OBDII code P0801 in my Hummer?

- Repairing or replacing the faulty reverse inhibit solenoid, fixing any damaged wiring or connectors, and addressing any issues with the transmission control module are typical steps to resolve this code.

7. Will resetting the OBDII code P0801 in my Hummer make it go away permanently?

- Simply resetting the code may temporarily clear it, but if the underlying issue causing the code is not fixed, it is likely to reappear.

8. Is it safe to ignore OBDII code P0801 in my Hummer?

- Ignoring this code can lead to further transmission problems and potential safety hazards, so it is best to address it promptly.

9. Can a DIY enthusiast repair OBDII code P0801 in a Hummer?

- Depending on your level of automotive expertise, you may be able to perform the necessary repairs for this code. However, working on transmission-related issues can be complex, so professional assistance is often recommended.

10. How much does it typically cost to fix OBDII code P0801 in a Hummer?

- The cost of fixing this code can vary depending on the specific issue causing it, but it may range from a couple of hundred dollars to over a thousand dollars, including parts and labor.