AutoCodes – GMC – B2472 GMC

B2472 GMC Code - Low Beam Output Fault

Quick Answer

Low beams are commanded by Platform Zone Module (PZM) through an output to headlight relay. Common causes include Faulty Headlight Switch, Headlight Switch harness is open or shorted, Headlight Switch 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: B2472 GMC indicates Low Beam Output Fault.
Common causes: Common causes include Faulty Headlight Switch, Headlight Switch harness is open or shorted, Headlight Switch 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 570

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 Dec 09, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2472 GMC Description

Low beams are commanded by Platform Zone Module (PZM) through an output to headlight relay. When the output is grounded, headlight input to IPC is also grounded.
A short to ground will be tested when exterior lights power is active, low beam output is inactive, headlight switch is not active, and Diagnostic Trouble Code (DTC) B1970 is not set as current. A short to the battery will be tested when exterior lights power is active, low beam output is active, and DTC B1970 is not set as current.
DTC B2472 will set when commanded state of low beams does not match the feedback state. When DTC B2472 is set, PZM will continue to command the state requested until IPC revokes request. DTC B2472 will clear when the commanded state matches the feedback state.

OBDII Code B2472 GMC - Low Beam Output Fault - AutoCodes.com — B2472 GMC Code - Low Beam Output Fault

What does this mean?

What are the Possible Causes of the DTC B2472 GMC?

Faulty Headlight Switch
Headlight Switch harness is open or shorted
Headlight Switch circuit poor electrical connection
Faulty Headlight Relay
Faulty Platform Zone Module (PZM)

How to Fix the DTC B2472 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 B2472 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.

Frequently Asked Questions about B2472 GMC Code

1. What are common symptoms of OBDII code B2472 GMC (Low Beam Output Fault)?

- Dim or non-functioning low beam headlights, flickering lights, or erratic beam patterns.

2. What are the possible causes of OBDII code B2472 GMC?

- Faulty low beam headlight bulbs, defective headlight assembly, wiring issues, or a malfunctioning control module.

3. How can I diagnose a Low Beam Output Fault (B2472) on a GMC vehicle?

- Use a multimeter to check the voltage at the headlight bulb connector, inspect the headlight assembly for any physical damage, and scan for trouble codes using an OBDII scanner.

4. Can a loose connection cause the OBDII code B2472 GMC to appear?

- Yes, loose or corroded connections at the headlight bulb, wiring harness, or control module can trigger a Low Beam Output Fault.

5. What are some repair tips for resolving OBDII code B2472 GMC?

- Start by checking and replacing faulty headlight bulbs, inspect and repair any damaged wiring, and reset the fault code using an OBDII scanner.

6. Is it safe to continue driving with OBDII code B2472 GMC active?

- It is not recommended to drive with malfunctioning low beam headlights, as it can compromise visibility and safety, especially at night or in low-light conditions.

7. Can extreme weather conditions trigger the Low Beam Output Fault (B2472) on a GMC vehicle?

- Yes, extreme cold or moisture can affect the electrical components of the headlight system, leading to a low beam output fault.

8. How much does it typically cost to repair OBDII code B2472 GMC at a mechanic or dealership?

- The cost can vary depending on the specific issue, but it may range from $50 for a simple bulb replacement to a few hundred dollars for more extensive repairs.

9. Are there any recalls related to the Low Beam Output Fault (B2472) in GMC vehicles?

- It is advisable to check with the manufacturer or visit the NHTSA website to see if there are any recalls related to this specific OBDII code.

10. Can resetting the OBDII code B2472 GMC using a scanner fix the issue permanently?

- Resetting the code may clear the fault temporarily, but it is crucial to address the underlying cause of the low beam output fault to prevent it from reoccurring.