AutoCodes – Generic – P0804

P0804 Code - 1-4 Upshift Skip Shift Lamp Control Circuit Malfunction

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 indicates 1-4 Upshift Skip Shift Lamp Control Circuit Malfunction.
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 11,291

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
Comments
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Code P0804 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 - 1-4 Upshift Skip Shift Lamp Control Circuit Malfunction - AutoCodes.com — P0804 Code - 1-4 Upshift Skip Shift Lamp Control Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC P0804?

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?

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 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.

Need more information about the P0804 code?

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Information for Specific Makes

P0804 Buick — Skip Shift Lamp Control Circuit
P0804 Cadillac — Skip Shift Lamp Control Circuit
P0804 Chevrolet — Skip Shift Lamp Control Circuit
P0804 GMC — Skip Shift Lamp Control Circuit
P0804 Hummer — Skip Shift Lamp Control Circuit
P0804 Mercedes-Benz — 1-4 Upshift Skip Shift Lamp Control Circuit Malfunction
P0804 Pontiac — Skip Shift Lamp Control Circuit
P0804 Saturn — Skip Shift Lamp Control Circuit

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.