B133B 2015 GMC Sierra Code - Reverse Gear Status Not Plausible
Quick Answer
The B133B diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates that the reverse gear status is not plausible. Common causes include Faulty reverse gear position sensor, Damaged wiring or connectors in the reverse gear circuit, Malfunctioning transmission control module. 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
- B133B 2015 GMC Sierra indicates Reverse Gear Status Not Plausible.
- Common causes
- Common causes include Faulty reverse gear position sensor, Damaged wiring or connectors in the reverse gear circuit, Malfunctioning transmission control module.
- 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.
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Code B133B 2015 GMC Sierra Description
The B133B diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates that the reverse gear status is not plausible. This means that the vehicle's onboard computer system has detected an inconsistency or error in the reverse gear position signal. This issue can impact the vehicle's performance by causing problems with shifting into or out of reverse gear, leading to difficulty in maneuvering the vehicle in reverse. It can also affect the accuracy of the reverse gear indicator on the dashboard.
Common Causes of B133B 2015 GMC Sierra
- Faulty reverse gear position sensor
- Damaged wiring or connectors in the reverse gear circuit
- Malfunctioning transmission control module
- Low transmission fluid level
- Mechanical issues with the transmission components
Symptoms of B133B 2015 GMC Sierra
- Difficulty shifting into or out of reverse gear
- Inaccurate reverse gear indicator on the dashboard
- Grinding or clunking noises when engaging reverse gear
- Vehicle getting stuck in reverse gear
How to Fix B133B 2015 GMC Sierra
- Begin by conducting a thorough diagnostic scan to retrieve the specific trouble codes and pinpoint the exact cause of the issue.
- Inspect the reverse gear position sensor and its wiring for any signs of damage or corrosion. Replace the sensor if necessary.
- Check the transmission control module for any faults or errors. Reset or reprogram the module as needed.
- Ensure that the transmission fluid level is at the correct level and top up or replace the fluid if it is low or contaminated.
- Test drive the vehicle to confirm that the issue has been resolved and that the reverse gear status is now accurate.
Cost to Fix B133B 2015 GMC Sierra
The typical repair costs for addressing a B133B code on a 2015 GMC Sierra can range from $200 to $500, depending on the specific cause of the issue and the labor rates at the auto repair shop. It's important to note that diagnosis time and labor rates can vary, so it's advisable to check with local shops for a more accurate estimate.
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Frequently Asked Questions about B133B 2015 GMC Sierra Code
1. What does the OBDII code B133B mean on a 2015 GMC Sierra?
B133B indicates a "Reverse Gear Status Not Plausible" fault, meaning the vehicle's control module has detected an issue with the reverse gear signal or its plausibility.
2. What are the common symptoms of the B133B code?
Symptoms may include the reverse gear not engaging, malfunction of the reverse lights, or a "Check Engine" or other warning light on the dashboard.
3. What causes the B133B code to appear?
Common causes include faulty transmission range sensors, damaged wiring or connectors in the reverse gear circuit, or a malfunctioning transmission control module (TCM).
4. Can a faulty shifter cause the B133B code?
Yes, a faulty gear shifter or its position sensor can cause the reverse gear status to be read as implausible.
5. How can I diagnose the B133B code?
Start by checking the transmission range sensor, inspecting wiring and connectors for damage, and using a scan tool to monitor the reverse gear position signal.
6. Is the B133B code serious?
It can be serious if the reverse gear fails to engage, which may affect drivability and safety. Prompt diagnosis and repair are recommended.
7. Can I fix the B133B code myself?
If you're comfortable with basic diagnostics, you can inspect the wiring, connectors, and transmission range sensor. However, more complex repairs may require professional help.
8. How much does it cost to repair the B133B code?
Repair costs vary depending on the issue. Replacing a transmission range sensor may cost $150–$300, while complex wiring repairs or TCM replacement can cost more.
9. Will clearing the B133B code fix the problem?
Clearing the code without addressing the root cause will only temporarily remove the warning. The code will likely return until the issue is resolved.
10. Can a low battery cause the B133B code?
In some cases, a weak or failing battery may cause erratic signals in the transmission system, potentially triggering the code. Always ensure the battery is in good condition.
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