B2473 Buick 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 Buick 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.
Code B2473 Buick Description
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.
What are the Possible Causes of the DTC B2473 Buick?
- 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 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 B2473 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.
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Frequently Asked Questions about B2473 Buick Code
1. What does OBDII code B2473 mean on a Buick?
Code B2473 indicates a High Beam Output Fault, suggesting an issue with the high beam circuit or related components.
2. What are the common symptoms of code B2473 in a Buick?
Symptoms may include high beams not functioning, flickering headlights, or the high beam indicator not illuminating on the dashboard.
3. What causes the B2473 High Beam Output Fault code?
Common causes include a blown fuse, faulty high beam bulb, damaged wiring, a malfunctioning headlight relay, or a defective body control module (BCM).
4. Can a faulty high beam bulb trigger code B2473 in a Buick?
Yes, a burned-out or faulty high beam bulb can trigger this code because the circuit is unable to complete its function.
5. How can I diagnose code B2473 on my Buick?
Check the high beam bulbs, inspect the wiring and connectors for damage, test the fuses, and use a multimeter to verify the relay and circuit continuity.
6. Is code B2473 specific to the high beams on both sides or just one side?
Code B2473 typically applies to the high beam circuit as a system, but further diagnosis can determine if the issue is isolated to one side.
7. Can a bad headlight relay cause code B2473 in a Buick?
Yes, a malfunctioning headlight relay can disrupt the high beam circuit and trigger this fault code.
8. Will clearing the B2473 code fix the issue?
Clearing the code without addressing the root cause will not fix the issue, and the code is likely to reappear.
9. How much does it cost to repair a B2473 code on a Buick?
Repair costs vary depending on the cause but can range from $20 for a bulb replacement to $200+ for wiring or module repairs.
10. Can I drive my Buick with code B2473 active?
While the car may still be drivable, driving without functioning high beams can be unsafe and may not comply with local lighting regulations.
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