B0873 - Understanding DTC B0873 - Common in 2015-2018 Chevrolet Silverado and GMC Sierra

Quick Answer

B0873 means: DTC B0873 indicates a problem with the transmission range switch circuit.

Fix: Check and replace faulty components Cost: $150 - $300 Time: 90-180 minutes

Can I drive with B0873? Immediate attention is recommended to avoid potential safety issues.

Common Questions

What does B0873 mean and how does it affect my car?

The B0873 code indicates a fault with the transmission range switch circuit, which can prevent your vehicle from starting or shifting gears properly. If ignored, it can lead to more serious transmission issues or safety hazards.

What are the most common causes of B0873 and how much does it cost to fix?

The most common cause of DTC B0873 is a faulty transmission range switch, which can cost between $150 and $300 to replace. Wiring issues and transmission control module failures are other potential causes, with repair costs varying based on the extent of the problem.

Can I drive my car with B0873 or should I stop immediately?

While you may be able to drive short distances, it is not advisable to continue driving with the B0873 code as it can lead to stalling or shifting issues that pose safety risks.

How can I diagnose B0873 myself using GeekOBD APP?

You can use the GeekOBD APP to scan for DTC codes, view freeze frame data, and monitor live sensor data to pinpoint issues related to the transmission range switch. Look for any anomalies in the readings that could indicate a fault.

What vehicles are most commonly affected by B0873?

The B0873 code is commonly found in 2015-2018 Chevrolet Silverado and GMC Sierra models, but it can also appear in other GM vehicles from that era with similar transmission systems.

How can I prevent B0873 from happening again?

Regular maintenance, including checking and replacing the transmission fluid and inspecting wiring connections, can help prevent the occurrence of the B0873 code in your vehicle.

What is B0873?

DTC B0873 refers to a diagnostic trouble code related to the transmission control system, specifically indicating a fault in the transmission range switch circuit. This code is prevalent in vehicles like the 2015-2018 Chevrolet Silverado and GMC Sierra. The transmission range switch, also known as the neutral safety switch, is responsible for telling the Engine Control Module (ECM) what gear the transmission is in. When the ECM detects an issue with this switch, it triggers the B0873 code, which can lead to various symptoms such as difficulty in shifting gears or the inability to start the vehicle. This code can also affect the vehicle's overall performance and safety, as it may cause the engine to stall or not respond properly during acceleration. If left unaddressed, the issue could escalate, leading to more significant transmission problems or safety hazards on the road. It is crucial for vehicle owners to understand the implications of DTC B0873, as timely diagnosis and repair can prevent further complications and ensure safe operation of the vehicle.

System: B - Body (Airbags, Lighting, Security, Climate Control)

Symptoms

Common symptoms when B0873 is present:

The check engine light illuminates continuously, indicating a fault in the transmission control system.
You may experience difficulty shifting gears, especially when trying to move from park to drive or reverse.
The engine may hesitate or stall unexpectedly during acceleration, which can be dangerous in traffic.
You could notice irregularities in the transmission's performance, such as slipping or delayed engagement.
In some cases, the vehicle may fail to start, as the transmission range switch may not communicate the correct gear position.

Possible Causes

Most common causes of B0873 (ordered by frequency):

{'cause': 'Faulty transmission range switch', 'likelihood': '60%', 'details': 'The most common cause of DTC B0873 is a malfunctioning transmission range switch, which may wear out over time or become damaged due to exposure to heat and vibrations.'}
{'cause': 'Wiring issue or poor connection', 'details': 'Damaged wiring or corroded connectors in the transmission control circuit can interrupt the signal to the ECM, leading to this trouble code.'}
{'cause': 'Transmission control module failure', 'details': 'Less commonly, a failure in the transmission control module itself can cause this code. Regular maintenance can help prevent such issues.'}
{'cause': 'Fluid leaks affecting transmission performance', 'details': 'Fluid leaks can cause low transmission fluid levels, affecting the range switch operation. Regularly checking and maintaining fluid levels can help prevent this.'}
{'cause': 'Internal transmission damage', 'details': 'Although rare, internal transmission damage can lead to false signals being sent to the ECM, triggering the B0873 code.'}

B0873 Repair Costs

Cost Breakdown by Repair Type

Transmission Range Switch Replacement

Replacing the faulty transmission range switch with a new one.

Total: $150 - $300
Success rate: 90%

Wiring Repair or Replacement

Repairing or replacing damaged wiring or connectors in the transmission circuit.

Total: $100 - $200
Success rate: 85%

Money-Saving Tips for B0873

Start with the most common and least expensive repairs first
Use GeekOBD APP to confirm diagnosis before replacing expensive parts
Consider preventive maintenance to avoid future occurrences
Compare prices for OEM vs aftermarket parts based on your needs
Address the issue promptly to prevent more expensive secondary damage

Diagnostic Steps

Professional B0873 Diagnosis Process

Follow these systematic steps to accurately diagnose B0873. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes)

Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes).