AutoCodes – Chevrolet – P1603 Chevrolet

P1603 Chevrolet Code - Loss Of Sensing Diagnostic Mode Data Conditions

Quick Answer

With the engine running engine speed over 500 rpm for 10 continuous seconds, the Powertrain Control Module (PCM) did not receive any Sensing Diagnostic Module (SDM) data or received invalid data during a 1 second period. Common causes include Faulty Sensing Diagnostic Module (SDM), Sensing Diagnostic Module harness is open or shorted, Sensing Diagnostic Module 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: P1603 Chevrolet indicates Loss Of Sensing Diagnostic Mode Data Conditions.
Common causes: Common causes include Faulty Sensing Diagnostic Module (SDM), Sensing Diagnostic Module harness is open or shorted, Sensing Diagnostic Module 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 6,672

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
Comments
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Code P1603 Chevrolet Description

OBDII Code P1603 Chevrolet - Loss Of Sensing Diagnostic Mode Data Conditions - AutoCodes.com — P1603 Chevrolet Code - Loss Of Sensing Diagnostic Mode Data Conditions

What does this mean?

What are the Possible Causes of the DTC P1603 Chevrolet?

Faulty Sensing Diagnostic Module (SDM)
Sensing Diagnostic Module harness is open or shorted
Sensing Diagnostic Module circuit poor electrical connection

How to Fix the DTC P1603 Chevrolet?

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 P1603 Chevrolet 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 P1603 Chevrolet 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.