B101D 2018 GMC Sierra Code - Electronic Control Unit Hardware
Quick Answer
Internal fault detection is handled inside the device. Common causes include Faulty Electronic Control Unit, Electronic Control Unit harness is open or shorted, Electronic Control Unit 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
- B101D 2018 GMC Sierra indicates Electronic Control Unit Hardware.
- Common causes
- Common causes include Faulty Electronic Control Unit, Electronic Control Unit harness is open or shorted, Electronic Control Unit 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 B101D 2018 GMC Sierra Description
What are the Possible Causes of the DTC B101D 2018 GMC Sierra?
- Faulty Electronic Control Unit
- Electronic Control Unit harness is open or shorted
- Electronic Control Unit circuit poor electrical connection
How to Fix the DTC B101D 2018 GMC Sierra?
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.
Code Tech Notes
B101D:F0 set in the BCM after a dead battery event. The rare condition that sets B101D:F0 is an extremely dead battery case. It is NOT the cause of the dead battery, but the extremely low voltage is a trigger that causes this DTC to be set. If DTC B101D:F0 is set current in the Body Control Module (BCM), clear the codes. If DTC B101D:F0 clears with no other symptoms, DO NOT replace the BCM.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B101D 2018 GMC Sierra 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.
Need more information about the B101D 2018 GMC Sierra code?
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Precautions for SRS “AIR BAG” and “SEAT BELT PRE-TENSIONER” Service
- Never probe the electrical connectors on air bag, side air curtain modules or seat belts.
- Never disassemble or tamper with safety belt buckle/retractor pretensioners, adaptive load limiting retractors, safety belt inflators, or probe the electrical connectors.
- Do not use electrical test equipment to check SRS circuits unless instructed to in this Service Manual.
- Before servicing the SRS, turn ignition switch OFF, disconnect both battery cables and wait at least 3 minutes. For approximately 3 minutes after the cables are removed, it is still possible for the air bag and seat belt pre-tensioner to deploy. Therefore, do not work on any SRS connectors or wires until at least 3 minutes have passed.
Failure to follow this instruction may result in the accidental deployment of these modules, which increases the risk of serious personal injury or death.
Frequently Asked Questions about B101D 2018 GMC Sierra Code
1. What does the OBDII code B101D mean on a 2018 GMC Sierra?
The code B101D indicates an issue with the Electronic Control Unit (ECU) hardware, typically pointing to a malfunction or fault within the ECU itself.
2. What are common symptoms of code B101D in a 2018 GMC Sierra?
Symptoms may include warning lights on the dashboard, erratic vehicle behavior, communication errors between modules, or failure of certain systems like audio, HVAC, or lighting.
3. What causes the B101D code on a 2018 GMC Sierra?
Common causes include a defective ECU, internal hardware failure, poor electrical connections, or damage from voltage surges or moisture exposure.
4. Can a loose connection trigger the B101D code?
Yes, loose or corroded wiring and connectors to the ECU may cause communication issues, potentially triggering the B101D code.
5. How is the B101D code diagnosed on a 2018 GMC Sierra?
A professional technician uses a scan tool to read codes, inspects the ECU and wiring for damage, and performs tests to confirm if the ECU hardware is faulty.
6. Can the B101D code clear itself on a 2018 GMC Sierra?
The code typically won’t clear itself unless the underlying issue is resolved, such as fixing a wiring issue or replacing a faulty ECU.
7. How do you fix the B101D code on a 2018 GMC Sierra?
Repairs could involve inspecting and repairing wiring, cleaning connections, reprogramming the ECU, or replacing the ECU if it has a hardware failure.
8. Is it safe to drive a 2018 GMC Sierra with the B101D code?
While the vehicle may still be drivable, certain systems may not function properly, so it’s recommended to address the issue promptly.
9. How much does it cost to fix the B101D code on a 2018 GMC Sierra?
Repair costs vary, but ECU replacement can range from $500 to $1,500, depending on labor and parts pricing. Smaller fixes like connection repairs are generally less expensive.
10. Can reprogramming the ECU fix the B101D code on a 2018 GMC Sierra?
Reprogramming may resolve the issue if it's related to software, but if the hardware is damaged, the ECU will likely need to be replaced.
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