AutoCodes – GMC – P1633 GMC

P1633 GMC 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 GMC 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 10,533

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
FAQs
Comments
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Code P1633 GMC 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 GMC - Ignition Supply Power Circuit Low Voltage - AutoCodes.com — P1633 GMC Code - Ignition Supply Power Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1633 GMC?

Low battery voltage
Blown fuse

How to Fix the DTC P1633 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 P1633 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 P1633 GMC code?

Need more information on how to fix the P1633 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1633 GMC code diagnosed by a professional: Find a repair shop in your area

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.

Frequently Asked Questions about P1633 GMC Code

1. What are the common symptoms of OBDII code P1633 GMC (Ignition Supply Power Circuit Low Voltage)?

- Common symptoms include intermittent or permanent check engine light illumination, difficulty starting the vehicle, and potential loss of engine power.

2. What are the possible causes of OBDII code P1633 GMC?

- The code P1633 GMC can be triggered by issues such as a faulty ignition switch, damaged wiring or connectors in the ignition supply circuit, or a malfunctioning powertrain control module (PCM).

3. How can I diagnose the reason behind OBDII code P1633 GMC?

- Diagnosing the code typically involves checking the condition of the ignition switch, inspecting the wiring and connectors for any damage, and using a diagnostic scanner to analyze the PCM's data.

4. Can a low vehicle battery voltage cause OBDII code P1633 GMC to appear?

- Yes, a low vehicle battery voltage can potentially trigger the code P1633 GMC due to insufficient power supply to the ignition circuit. It is advisable to ensure the battery is in good condition.

5. What are some repair tips for addressing OBDII code P1633 GMC?

- Repair tips may include repairing or replacing damaged wiring, connectors, or the ignition switch, ensuring proper battery voltage, and resetting the PCM after making necessary repairs.

6. Is it safe to continue driving with OBDII code P1633 GMC present?

- It is not recommended to continue driving with the code P1633 GMC active, as it can lead to potential issues like stalling or further damage to the vehicle's components. It's best to address the underlying problem promptly.

7. Can a DIY enthusiast fix OBDII code P1633 GMC at home?

- Depending on the specific cause of the code, some DIY enthusiasts with automotive repair experience may be able to address OBDII code P1633 GMC at home by following diagnostic procedures and making necessary repairs.

8. How much does it typically cost to repair OBDII code P1633 GMC at a mechanic's shop?

- The cost of repairing OBDII code P1633 GMC at a mechanic's shop can vary based on the exact cause of the issue, the labor rates in your area, and the cost of any parts that may need to be replaced. It's advisable to get a quote from a trusted mechanic.

9. Can weather conditions affect the appearance of OBDII code P1633 GMC?

- Extreme weather conditions, especially cold temperatures, can potentially impact the electrical components related to the ignition supply circuit, leading to the appearance of OBDII code P1633 GMC. It's important to keep the vehicle protected in such conditions.

10. Should I reset the PCM after resolving OBDII code P1633 GMC?

- Yes, it is recommended to reset the PCM after resolving OBDII code P1633 GMC to clear the stored trouble codes and ensure the system recognizes the repairs. This can often be done using a diagnostic scanner or by disconnecting the battery for a short period.