AutoCodes – GMC – B2473 GMC

B2473 GMC Code - High Beam Output Fault

Quick Answer

High beams are commanded by Platform Zone Module (PZM) through an output to HI/LO beam relay. Common causes include Faulty High/Low Headlamp Relay, High/Low Headlamp Relay harness is open or shorted, High/Low Headlamp Relay 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: B2473 GMC indicates High Beam Output Fault.
Common causes: Common causes include Faulty High/Low Headlamp Relay, High/Low Headlamp Relay harness is open or shorted, High/Low Headlamp Relay 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 892

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 B2473 GMC Description

High beams are commanded by Platform Zone Module (PZM) through an output to HI/LO beam relay. When headlight relay is energized, HI/LO beam relay provides power source to low beams or high beams.
The Diagnostic Trouble Code (DTC) B2473 will set when commanded state of high beams does not match the feedback state. When DTC B2473 is set, PZM will continue to command state requested until IPC revokes request. DTC B2473 will clear when the commanded state matches the feedback state.

OBDII Code B2473 GMC - High Beam Output Fault - AutoCodes.com — B2473 GMC Code - High Beam Output Fault

What does this mean?

What are the Possible Causes of the DTC B2473 GMC?

Faulty High/Low Headlamp Relay
High/Low Headlamp Relay harness is open or shorted
High/Low Headlamp Relay circuit poor electrical connection
Faulty Platform Zone Module (PZM)

How to Fix the DTC B2473 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 B2473 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 B2473 GMC Code

1. What are the common symptoms of OBDII code B2473 GMC (High Beam Output Fault)?

Common symptoms include malfunctioning high beam headlights, dim or flickering high beams, or high beams that do not turn on at all.

2. What are the possible causes of OBDII code B2473 GMC?

Possible causes include a faulty high beam relay, a damaged high beam switch, wiring issues in the high beam circuit, or a problem with the high beam bulb.

3. How can I diagnose the High Beam Output Fault (B2473) in my GMC vehicle?

A thorough visual inspection of the high beam components, testing the relay and switch functionality, and checking the wiring for any signs of damage are good starting points for diagnosis.

4. Can I repair the High Beam Output Fault (B2473) in my GMC vehicle myself?

Depending on your experience and comfort level with automotive electrical systems, you may be able to repair the issue yourself by replacing the faulty component or fixing the wiring problem.

5. Is it safe to drive with the OBDII code B2473 GMC (High Beam Output Fault) active?

It is generally safe to drive with this fault, but you may experience reduced visibility at night or in low-light conditions due to the high beams not functioning properly.

6. What are some tips for preventing the recurrence of OBDII code B2473 GMC (High Beam Output Fault)?

Regularly inspecting and maintaining your vehicle's lighting system, promptly addressing any issues with high beam operation, and using high-quality replacement parts can help prevent this fault from reoccurring.

7. Can a mechanic reset the OBDII code B2473 GMC (High Beam Output Fault) after repairs have been made?

Yes, a mechanic or automotive technician can use a diagnostic scanner to reset the trouble code after the necessary repairs have been completed successfully.

8. Are there any specific models of GMC vehicles known to be more prone to experiencing the High Beam Output Fault (B2473)?

While this fault can occur in various GMC models, some older vehicles with higher mileage may be more susceptible due to wear and tear on the electrical components.

9. What should I do if the High Beam Output Fault (B2473) persists after attempting repairs?

If the fault persists after repairs, it may indicate a more complex underlying issue that requires further diagnosis by a qualified mechanic or dealership service center.

10. How much can I expect to pay for repairs related to the OBDII code B2473 GMC (High Beam Output Fault)?

The cost of repairs can vary depending on the specific cause of the fault, the labor rates in your area, and whether you choose to repair the issue yourself or seek professional assistance.