AutoCodes – Buick – P1633 Buick

P1633 Buick Code - Ignition Supply Power Circuit Low Voltage

Quick Answer

With the key on, no Class 2 serial data received, the Powertrain Control Module (PCM) detects an improper Supplement Power Circuit (Circuit 0) voltage Common causes include Low battery voltage, Blown fuse. 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: P1633 Buick indicates Ignition Supply Power Circuit Low Voltage.
Common causes: Common causes include Low battery voltage, Blown fuse.
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 4,623

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 02, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
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Code P1633 Buick Description

With the key on, no Class 2 serial data received, the Powertrain Control Module (PCM) detects an improper Supplement Power Circuit (Circuit 0) voltage

OBDII Code P1633 Buick - Ignition Supply Power Circuit Low Voltage - AutoCodes.com — P1633 Buick Code - Ignition Supply Power Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1633 Buick?

Low battery voltage
Blown fuse

How to Fix the DTC P1633 Buick?

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 P1633 Buick 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 P1633 Buick 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.