AutoCodes – GMC – B3802 GMC

B3802 GMC Code - Park Lamps Request Circuit

Quick Answer

The Body Control Module (BCM) monitors the park lamp switch on signal circuit and the headlamp switch headlamps on signal circuit in order to determine when the park lamps and headlamps should be illuminated. Common causes include Faulty Headlamp Switch, Headlamp Switch harness is open or shorted, Headlamp 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: B3802 GMC indicates Park Lamps Request Circuit.
Common causes: Common causes include Faulty Headlamp Switch, Headlamp Switch harness is open or shorted, Headlamp 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 1,760

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 Mar 17, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B3802 GMC Description

The Body Control Module (BCM) monitors the park lamp switch on signal circuit and the headlamp switch headlamps on signal circuit in order to determine when the park lamps and headlamps should be illuminated. When the headlamp switch is turned to PARK, the BCM senses that the park lamp switch signal on circuit is grounded and the headlamps switch headlamps ON signal circuit is open. The BCM will then energize the park lamp relay illuminating the park lamps. When the headlamp switch is turned to HEAD, the BCM senses that the park lamp switch on signal circuit and the headlamp switch headlamps ON signal circuit are grounded. The BCM will then energize the park lamp relay and headlamp low beam relay or high beam relay illuminating the park lamps and headlamps. The Diagnostic Trouble Code (DTC) sets when the headlamp switch park lamps ON signal circuit is open or has a high resistance.

OBDII Code B3802 GMC - Park Lamps Request Circuit - AutoCodes.com — B3802 GMC Code - Park Lamps Request Circuit

What does this mean?

What are the Possible Causes of the DTC B3802 GMC?

Faulty Headlamp Switch
Headlamp Switch harness is open or shorted
Headlamp Switch circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B3802 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 B3802 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 B3802 GMC Code

1. What are the common symptoms of OBDII code B3802 GMC (Park Lamps Request Circuit)?

- Common symptoms include inoperative park lamps, dim or flickering park lamps, or the park lamps staying on constantly.

2. What could cause the OBDII code B3802 GMC to trigger?

- The code may be triggered by a faulty park lamp relay, a damaged park lamp circuit, or a malfunctioning body control module.

3. How can I diagnose the Park Lamps Request Circuit issue?

- You can diagnose the issue by checking the park lamp fuse, inspecting the park lamp wiring for any damage, and testing the park lamp relay for proper functionality.

4. Can a bad battery or alternator cause the B3802 GMC code to appear?

- Yes, a weak battery or a failing alternator can sometimes lead to electrical issues, including triggering the B3802 code related to the park lamps.

5. Are there any quick repair tips for fixing the Park Lamps Request Circuit problem?

- Quick repair tips include checking and replacing any blown fuses, ensuring all park lamp bulbs are in good condition, and resetting the trouble code after making repairs.

6. Is it safe to continue driving with the B3802 GMC trouble code active?

- It is generally safe to drive with the code as long as the park lamps are working properly. However, it is recommended to address the issue promptly to avoid potential safety hazards.

7. Can extreme weather conditions impact the Park Lamps Request Circuit and trigger the B3802 code?

- Yes, extreme weather conditions like heavy rain, snow, or extreme heat can potentially damage the park lamp circuit and cause the B3802 GMC trouble code to appear.

8. How much does it typically cost to repair the Park Lamps Request Circuit issue associated with the B3802 code?

- The cost of repair can vary depending on the underlying cause, but it may range from $100 to $300 for parts and labor at a repair shop.

9. Will resetting the trouble code make it go away permanently?

- Resetting the trouble code may clear it temporarily, but if the underlying issue causing the B3802 code is not fixed, the code is likely to reappear.

10. Can I fix the B3802 GMC code related to the Park Lamps Request Circuit myself, or should I seek professional help?

- If you have experience with automotive electrical systems, you may attempt to diagnose and fix the issue yourself. However, if you are unsure or encounter difficulty, it is advisable to seek professional help to ensure proper repair.