B356A GMC Code - Vehicle Direction Warning Switch Circuit
Quick Answer
The lane departure warning system is controlled by the Active Safety Control Module. Common causes include Faulty Vehicle Direction Warning Switch, Vehicle Direction Warning Switch harness is open or shorted, Vehicle Direction Warning 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
- B356A GMC indicates Vehicle Direction Warning Switch Circuit.
- Common causes
- Common causes include Faulty Vehicle Direction Warning Switch, Vehicle Direction Warning Switch harness is open or shorted, Vehicle Direction Warning 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 B356A GMC Description
When the Frontview Camera module is operating and can detect the lane markings, the Frontview Camera module will request via serial data communications that the instrument panel cluster illuminate the green lane departure ready–to–assist indicator. If the Frontview Camera module detects that the vehicle has crossed a lane marking without the turn signal being used, the module will request that the instrument cluster flash the yellow lane departure warning indicator. An audible warning may also sound three times, or the haptic seat (if equipped) may pulse when the yellow Instrument Cluster indicator is flashing. The driver can select between audible or haptic alerts in the vehicle personalization menu. The Diagnostic Trouble Code (DTC) will be set when the Active Safety Control Module has detected a short to ground, short to voltage, or an open/high resistance for more than 10 s.
What are the Possible Causes of the DTC B356A GMC?
- Faulty Vehicle Direction Warning Switch
- Vehicle Direction Warning Switch harness is open or shorted
- Vehicle Direction Warning Switch circuit poor electrical connection
- Faulty Frontview Camera Module
- Faulty Active Safety Control Module
How to Fix the DTC B356A 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 B356A 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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Information for Specific GMC Models
- B356A 2014 GMC Sierra — Vehicle Direction Warning Switch Circuit
- B356A 2015 GMC Sierra — Vehicle Direction Warning Switch Circuit
- B356A 2016 GMC Sierra — Vehicle Direction Warning Switch Circuit
- B356A 2017 GMC Sierra — Vehicle Direction Warning Switch Circuit
- B356A 2018 GMC Sierra — Vehicle Direction Warning Switch Circuit
Frequently Asked Questions about B356A GMC Code
1. What does the OBDII code B356A mean on a GMC vehicle?
B356A refers to a fault in the Vehicle Direction Warning Switch Circuit, which is part of the system responsible for providing directional warning functionality.
2. What are common symptoms of the B356A code in GMC vehicles?
Symptoms may include malfunctioning directional warning indicators, an illuminated check engine light, or warnings on the dashboard related to driver assistance systems.
3. What causes the B356A code to appear?
Possible causes include a faulty vehicle direction warning switch, damaged wiring or connectors in the circuit, or a malfunction in the related control module.
4. How do I diagnose the B356A code on my GMC?
Start by inspecting the wiring and connections around the direction warning switch for damage or corrosion, then test the switch itself for proper functionality using a multimeter.
5. Can I drive my GMC with the B356A code active?
While the vehicle may still be drivable, the directional warning system may not function properly, which could compromise safety. It’s best to address the issue promptly.
6. How is the B356A code repaired?
Repairs may involve replacing the faulty direction warning switch, repairing or replacing damaged wiring, or reprogramming or replacing the control module if necessary.
7. How much does it cost to fix the B356A code on a GMC?
Repair costs vary depending on the exact issue but may range from $100 to $500, depending on parts and labor.
8. Can clearing the B356A code fix the issue?
Clearing the code may turn off the warning temporarily, but if the underlying issue isn’t resolved, the code will likely reappear.
9. What tools are needed to troubleshoot the B356A code?
You’ll need an OBDII scanner, a multimeter for testing electrical components, and potentially a wiring diagram specific to your GMC model.
10. Does the B356A code affect other vehicle systems?
It can, especially if the directional warning system is integrated with advanced driver-assistance systems (ADAS) like blind-spot monitoring or lane departure warnings.
Discuss the causes and fixes for B356A GMC OBDII Code
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