B2620 Chevrolet Code - Display Dimming Pulse Width Modulation Input Circuit
Quick Answer
The Body Control Module (BCM) directly sends a 5-volt reference voltage to the Instrument Panel (I/P) dimmer switch which is then adjusted based on the I/P dimmer switch position and returned as a dimming return and dimming input to the BCM. 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
- B2620 Chevrolet indicates Display Dimming Pulse Width Modulation Input 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.
Code B2620 Chevrolet Description
What are the Possible Causes of the DTC B2620 Chevrolet?
- 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 B2620 Chevrolet?
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 B2620 Chevrolet 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 B2620 Chevrolet Code
1. What does the OBDII code B2620 mean on a Chevrolet?
The B2620 code indicates a problem with the Display Dimming Pulse Width Modulation (PWM) Input Circuit, which controls the brightness of the dashboard display.
2. What are common symptoms of the B2620 code in a Chevrolet?
Common symptoms include the dashboard display not dimming or brightening properly, flickering lights, or the display being stuck at a single brightness level.
3. What causes the B2620 code to appear in a Chevrolet?
Causes can include a faulty dimmer switch, damaged wiring or connectors in the dimming circuit, a malfunctioning Body Control Module (BCM), or a blown fuse.
4. Can a faulty BCM cause the B2620 code?
Yes, a malfunctioning Body Control Module (BCM) can fail to process the PWM signal properly, triggering the B2620 code.
5. How do you diagnose the B2620 code on a Chevrolet?
Diagnose the code by checking for loose or damaged wires, inspecting the dimmer switch for proper functionality, and using a scan tool to monitor the PWM signal and BCM performance.
6. Is it safe to drive with the B2620 code?
Yes, it is generally safe to drive, but the inability to adjust display brightness can be inconvenient, especially in low-light or nighttime conditions.
7. How can you fix the B2620 code on a Chevrolet?
Fixes may include replacing the dimmer switch, repairing damaged wiring or connectors, resetting or reprogramming the BCM, or replacing a faulty BCM if necessary.
8. Can a blown fuse cause the B2620 code?
Yes, a blown fuse in the dimming circuit can interrupt the PWM signal and cause the B2620 code to appear.
9. How much does it cost to repair the B2620 code on a Chevrolet?
Repair costs can range from $50 to $500, depending on whether the issue is a simple wiring fix or requires BCM replacement.
10. Can clearing the B2620 code solve the issue permanently?
Clearing the code may reset the system temporarily, but the underlying issue must be resolved to prevent the code from returning.
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