B1420 GMC Code - Device Voltage Circuit
Quick Answer
The Body Control Module (BCM) monitors the battery voltage on the battery voltage signal circuit. Common causes include Faulty Body Control Module (BCM), Body Control Module harness is open or shorted, Body Control Module 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
- B1420 GMC indicates Device Voltage Circuit.
- Common causes
- Common causes include Faulty Body Control Module (BCM), Body Control Module harness is open or shorted, Body Control Module 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 B1420 GMC Description
What are the Possible Causes of the DTC B1420 GMC?
- Faulty Body Control Module (BCM)
- Body Control Module harness is open or shorted
- Body Control Module circuit poor electrical connection
How to Fix the DTC B1420 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 B1420 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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Frequently Asked Questions about B1420 GMC Code
1. What does the OBDII code B1420 mean on a GMC?
B1420 indicates a problem in the device voltage circuit, typically related to low or inconsistent voltage in a specific system or module.
2. What are the common symptoms of the B1420 code on a GMC vehicle?
Symptoms may include malfunctioning electronic components, warning lights on the dashboard, or erratic system behavior.
3. What causes the B1420 code to appear in a GMC?
Common causes include a weak or failing battery, faulty wiring, loose or corroded electrical connections, or a malfunctioning control module.
4. Can a low battery trigger the B1420 code in a GMC?
Yes, a low or failing battery can cause insufficient voltage, leading to the B1420 code.
5. How do I diagnose the B1420 code on my GMC?
Start by checking the battery voltage, inspecting wiring and connectors for damage or corrosion, and using a scan tool to identify the affected module or circuit.
6. What tools are needed to fix the B1420 code in a GMC vehicle?
You may need a multimeter to test voltage, a scan tool to read and clear codes, and basic tools for repairing wiring or connectors.
7. Can I still drive my GMC with the B1420 code active?
Driving may be possible, but it’s not recommended as the issue could lead to further electrical problems or affect critical systems.
8. How can I fix the B1420 code in a GMC?
Repairs may involve replacing a weak battery, repairing damaged wiring, cleaning corroded connections, or replacing a faulty control module.
9. Does the B1420 code always mean a faulty module in a GMC?
No, while a faulty module is one possibility, the issue is more commonly caused by wiring problems or low system voltage.
10. How much does it cost to repair the B1420 code on a GMC?
Costs can range from $50 to $300, depending on whether the issue is related to simple wiring repairs or replacement of a module.
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