AutoCodes – GMC – P1601 GMC

P1601 GMC Code - Serial Communication Malfunction

Quick Answer

CAN data bus, Engine Control Module (ECM)/Antilock Brake System (ABS)/Traction Control System (TCS)/Instrumentation Control Module/Diagnostic Control Module – some communication lost Common causes include Serial Communication lost between Engine Control Module (ECM) and other control units. 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: P1601 GMC indicates Serial Communication Malfunction.
Common causes: Common causes include Serial Communication lost between Engine Control Module (ECM) and other control units.
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 5,018

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 20, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
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Code P1601 GMC Description

CAN data bus, Engine Control Module (ECM)/Antilock Brake System (ABS)/Traction Control System (TCS)/Instrumentation Control Module/Diagnostic Control Module – some communication lost

OBDII Code P1601 GMC - Serial Communication Malfunction - AutoCodes.com — P1601 GMC Code - Serial Communication Malfunction

What does this mean?

What are the Possible Causes of the DTC P1601 GMC?

Serial Communication lost between Engine Control Module (ECM) and other control units

How to Fix the DTC P1601 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 P1601 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.

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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.