P1591 2015 GMC Sierra Code - Body Control Module Engine Speed Request Signal Message Counter Incorrect
Quick Answer
The P1591 diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates that the Body Control Module (BCM) has detected an issue with the engine speed request signal message counter being incorrect. Common causes include Faulty engine speed sensor, Wiring or connection issues between the engine speed sensor and BCM, BCM software malfunction. 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
- P1591 2015 GMC Sierra indicates Body Control Module Engine Speed Request Signal Message Counter Incorrect.
- Common causes
- Common causes include Faulty engine speed sensor, Wiring or connection issues between the engine speed sensor and BCM, BCM software malfunction.
- 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 P1591 2015 GMC Sierra Description
The P1591 diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates that the Body Control Module (BCM) has detected an issue with the engine speed request signal message counter being incorrect. The BCM is responsible for controlling various electrical systems in the vehicle, including lighting, power windows, and door locks. In this case, the BCM is not receiving the correct number of engine speed request signal messages, which could lead to a variety of performance issues.
Common Causes of P1591 2015 GMC Sierra
- Faulty engine speed sensor
- Wiring or connection issues between the engine speed sensor and BCM
- BCM software malfunction
- Electrical interference or signal disruption
- Faulty BCM
Symptoms of P1591 2015 GMC Sierra
- Engine stalling or rough idling
- Difficulty starting the engine
- Inconsistent or erratic engine performance
- Malfunctioning electrical systems (e.g., lighting, power windows)
- Check Engine Light illuminated on the dashboard
How to Fix P1591 2015 GMC Sierra
- Begin by using a diagnostic scanner to retrieve the specific trouble codes and confirm the presence of P1591.
- Inspect the engine speed sensor and its wiring for any visible damage or loose connections. Replace or repair as necessary.
- Check the BCM for any signs of malfunction or software issues. Perform a software update or replace the BCM if needed.
- Clear the trouble codes from the vehicle's memory using the diagnostic scanner.
- Test drive the vehicle to ensure that the issue has been resolved and that the code does not return.
Cost to Fix P1591 2015 GMC Sierra
The cost of repairing a P1591 code on a 2015 GMC Sierra can vary depending on the specific cause of the issue. In general, the repair costs may range from $100 to $500, including parts and labor. However, it is important to note that diagnostic time and labor rates at auto repair shops can vary significantly. It is recommended to consult with a qualified mechanic or dealership to get an accurate estimate based on your location and vehicle specifics.
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Frequently Asked Questions about P1591 2015 GMC Sierra Code
What are the common symptoms of OBDII code P1591 in a 2015 GMC Sierra?
Common symptoms of OBDII code P1591 in a 2015 GMC Sierra may include engine stalling, rough idling, poor acceleration, and the inability to start the vehicle.
What can cause the OBDII code P1591 to trigger in a 2015 GMC Sierra?
The OBDII code P1591 in a 2015 GMC Sierra is typically triggered when the Body Control Module detects an incorrect engine speed request signal message counter. This can be caused by issues with the Body Control Module itself, wiring problems, or a faulty engine speed sensor.
How can I diagnose the OBDII code P1591 in my 2015 GMC Sierra?
Diagnosing the OBDII code P1591 in a 2015 GMC Sierra involves using a diagnostic scanner to retrieve the code and then performing a thorough inspection of the Body Control Module, wiring, and engine speed sensor to identify the root cause of the issue.
What are some repair tips for fixing the OBDII code P1591 in a 2015 GMC Sierra?
Repairing the OBDII code P1591 in a 2015 GMC Sierra may involve resetting the code, checking and repairing any damaged wiring, replacing a faulty engine speed sensor, or reprogramming the Body Control Module if necessary.
Is it safe to continue driving my 2015 GMC Sierra with the OBDII code P1591 present?
It is not recommended to continue driving your 2015 GMC Sierra with the OBDII code P1591 present, as it can lead to potential engine performance issues and further damage if left unresolved. It's best to address the issue promptly to avoid any additional problems.
Can I reset the OBDII code P1591 in my 2015 GMC Sierra by disconnecting the battery?
While disconnecting the battery may reset the OBDII code temporarily, it may not fix the underlying issue causing the code to trigger. It's important to diagnose and address the root cause of the problem to prevent the code from reappearing.
How much does it typically cost to repair the OBDII code P1591 in a 2015 GMC Sierra?
The cost of repairing the OBDII code P1591 in a 2015 GMC Sierra can vary depending on the specific cause of the issue. Costs may range from a simple sensor replacement to more extensive repairs involving the Body Control Module.
Can a DIY enthusiast fix the OBDII code P1591 in a 2015 GMC Sierra?
While some DIY enthusiasts may be able to address simple causes of the OBDII code P1591, such as checking and repairing wiring connections, more complex issues involving the Body Control Module or engine speed sensor may require professional assistance.
How long does it take to repair the OBDII code P1591 in a 2015 GMC Sierra?
The time needed to repair the OBDII code P1591 in a 2015 GMC Sierra can vary depending on the specific cause of the issue and the extent of the repairs needed. Simple fixes may take a few hours, while more complex issues could take longer to diagnose and repair.
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