AutoCodes – Hummer – P0804 Hummer

P0804 Hummer Code - Skip Shift Lamp Control Circuit

Quick Answer

An ignition voltage is supplied to the Skip Shift Lamp. Common causes include Faulty Skip Shift Lamp, Skip Shift Lamp harness is open or shorted, Skip Shift Lamp 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: P0804 Hummer indicates Skip Shift Lamp Control Circuit.
Common causes: Common causes include Faulty Skip Shift Lamp, Skip Shift Lamp harness is open or shorted, Skip Shift Lamp 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 3,187

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 P0804 Hummer Description

An ignition voltage is supplied to the Skip Shift Lamp. The Powertrain Control Module (PCM) controls the lamp 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).

OBDII Code P0804 Hummer - Skip Shift Lamp Control Circuit - AutoCodes.com — P0804 Hummer Code - Skip Shift Lamp Control Circuit

What does this mean?

What are the Possible Causes of the DTC P0804 Hummer?

Faulty Skip Shift Lamp
Skip Shift Lamp harness is open or shorted
Skip Shift Lamp circuit poor electrical connection

How to Fix the DTC P0804 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 P0804 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 P0804 Hummer Code

1. What are the common symptoms of OBDII code P0804 (Hummer) related to the Skip Shift Lamp Control Circuit?

The common symptoms include the skip shift lamp not illuminating properly or staying on constantly, difficulty shifting gears, and potential issues with the skip shift function.

2. What are the possible causes of OBDII code P0804 in a Hummer?

The code P0804 in a Hummer is typically caused by a faulty skip shift lamp control circuit, a defective skip shift solenoid, wiring issues, or a malfunctioning PCM (powertrain control module).

3. How can I diagnose the cause of OBDII code P0804 in my Hummer?

Diagnosing OBDII code P0804 involves checking the skip shift lamp operation, inspecting the skip shift solenoid and its wiring for any damage, and using a scan tool to analyze the PCM data for any related faults.

4. Can I still drive my Hummer with OBDII code P0804 present?

It is generally safe to drive your Hummer with the P0804 code, but it is recommended to address the issue promptly to prevent potential transmission problems and ensure proper functionality of the skip shift system.

5. How do I repair OBDII code P0804 in my Hummer?

Repairing OBDII code P0804 may involve replacing the skip shift solenoid, repairing or replacing damaged wiring, or resetting the PCM to clear the fault code. It is advisable to seek professional help if you are not familiar with automotive electrical systems.

6. Is OBDII code P0804 a serious issue in a Hummer?

While OBDII code P0804 may not pose an immediate danger, it can lead to transmission-related issues if left unresolved. It is best to address the problem promptly to avoid further complications.

7. Can a DIY enthusiast fix OBDII code P0804 in a Hummer?

If you have experience working on automotive electrical systems and access to the necessary tools, you may be able to diagnose and repair OBDII code P0804 yourself. However, if you are unsure or uncomfortable with the process, it is recommended to consult a professional mechanic.

8. How much does it cost to repair OBDII code P0804 in a Hummer?

The cost of repairing OBDII code P0804 in a Hummer can vary depending on the specific cause of the issue, the labor rates in your area, and whether you choose to replace parts yourself or have a mechanic perform the repairs. It is advisable to get a few quotes from different repair shops.

9. Can OBDII code P0804 in a Hummer trigger other fault codes?

In some cases, OBDII code P0804 may trigger additional fault codes related to the transmission or communication issues. It is essential to address all fault codes present to ensure a comprehensive repair.

10. How can I prevent OBDII code P0804 from recurring in my Hummer?

To prevent OBDII code P0804 from recurring, it is essential to perform regular maintenance on the skip shift system, inspect the wiring for any damage periodically, and address any related issues promptly to avoid further complications.