AutoCodes – Cadillac – P1804 Cadillac

P1804 Cadillac Code - Ground Control Relay

Quick Answer

P1804 Cadillac indicates Ground Control Relay. Common causes include Faulty Ground Control Relay, Ground Control Relay harness is open or shorted, Ground Control Relay 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: P1804 Cadillac indicates Ground Control Relay.
Common causes: Common causes include Faulty Ground Control Relay, Ground Control Relay harness is open or shorted, Ground Control Relay 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 3,206

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 Sep 20, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P1804 Cadillac Description

OBDII Code P1804 Cadillac - Ground Control Relay - AutoCodes.com — P1804 Cadillac Code - Ground Control Relay

What does this mean?

What are the Possible Causes of the DTC P1804 Cadillac?

Faulty Ground Control Relay
Ground Control Relay harness is open or shorted
Ground Control Relay circuit poor electrical connection

How to Fix the DTC P1804 Cadillac?

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 P1804 Cadillac 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 P1804 Cadillac code?

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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.