AutoCodes – GMC – P1654 GMC

P1654 GMC Code - A/C Relay Control Circuit Conditions

Quick Answer

With the engine running, the Powertrain Control Module (PCM) detects an improper voltage level on ODM 'B' output 4 fault line circuit, all conditions met for 5-30 seconds (length of time to set vanes by engine family). Common causes include Faulty A/C Relay, A/C Relay harness is open or shorted, A/C Relay circuit poor electrical connection. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means: P1654 GMC indicates A/C Relay Control Circuit Conditions.
Common causes: Common causes include Faulty A/C Relay, A/C Relay harness is open or shorted, A/C Relay circuit poor electrical connection.
Severity: Moderate - service should be scheduled soon.
Can I drive?: The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

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Code Popularity 5,616

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 06, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P1654 GMC Description

OBDII Code P1654 GMC - A/C Relay Control Circuit Conditions - AutoCodes.com — P1654 GMC Code - A/C Relay Control Circuit Conditions

What does this mean?

What are the Possible Causes of the DTC P1654 GMC?

Faulty A/C Relay
A/C Relay harness is open or shorted
A/C Relay circuit poor electrical connection

How to Fix the DTC P1654 GMC?

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 P1654 GMC 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 P1654 GMC 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.