P1591 2014 GMC Sierra Code - Body Control Module Engine Speed Request Signal Message Counter Incorrect
Quick Answer
The P1591 diagnostic trouble code (DTC) for a 2014 GMC Sierra indicates that the Body Control Module (BCM) has detected an incorrect engine speed request signal message counter. 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 2014 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 2014 GMC Sierra Description
The P1591 diagnostic trouble code (DTC) for a 2014 GMC Sierra indicates that the Body Control Module (BCM) has detected an incorrect engine speed request signal message counter. The BCM plays a crucial role in controlling various electrical systems in the vehicle, including lighting, power windows, door locks, and more. In this case, the BCM is receiving an engine speed request signal that does not match the expected message counter, leading to a communication error between the BCM and the engine control module (ECM).
Common Causes of P1591 2014 GMC Sierra
- Faulty engine speed sensor.
- Wiring or connection issues between the engine speed sensor and BCM.
- BCM software malfunction.
- ECM malfunction.
- Communication network issues within the vehicle's electrical system.
Symptoms of P1591 2014 GMC Sierra
- Check engine light illuminated on the dashboard.
- Engine running erratically or experiencing performance issues.
- Vehicle may stall or have difficulty starting.
- Inconsistent operation of electrical components controlled by the BCM.
- Fuel efficiency may decrease.
How to Fix P1591 2014 GMC Sierra
- Begin by using a diagnostic scanner to retrieve and record all fault codes present in the vehicle's system.
- Inspect the engine speed sensor and its wiring for any signs of damage or corrosion. Replace the sensor if necessary.
- Check the connections between the engine speed sensor and BCM for proper contact and secure wiring.
- Perform a software update or reprogramming of the BCM to ensure it is functioning correctly.
- If the issue persists, further diagnostic testing may be required to pinpoint the exact cause of the communication error.
Cost to Fix P1591 2014 GMC Sierra
The cost of repairing a P1591 code on a 2014 GMC Sierra can vary depending on the specific cause of the issue. In general, the replacement of an engine speed sensor can range from $100 to $300, including parts and labor. If additional repairs or software updates are needed, the total cost may increase. It is recommended to consult with a qualified mechanic or dealership to obtain an accurate estimate based on the specific circumstances of the vehicle. Keep in mind that labor rates and diagnostic fees can vary, so it's advisable to inquire about these costs upfront.
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Frequently Asked Questions about P1591 2014 GMC Sierra Code
What does the OBDII code P1591 mean on a 2014 GMC Sierra?
Code P1591 indicates that the Body Control Module (BCM) is detecting an incorrect message counter for the engine speed request signal.
What are common symptoms of code P1591 on a 2014 GMC Sierra?
Symptoms may include reduced engine performance, irregular idle, warning lights such as the check engine light, or limited communication between modules.
What causes code P1591 on a 2014 GMC Sierra?
Possible causes include a malfunctioning Body Control Module (BCM), wiring issues, poor electrical connections, or corrupted software within the BCM.
Can a faulty BCM cause code P1591 on a 2014 GMC Sierra?
Yes, a faulty BCM can misinterpret or fail to process the engine speed request signal correctly, triggering code P1591.
How do you diagnose code P1591 on a 2014 GMC Sierra?
Diagnosis involves scanning for trouble codes, inspecting wiring and connectors related to the BCM, and verifying the integrity of module communication protocols.
Can a software update fix code P1591 on a 2014 GMC Sierra?
In some cases, a BCM software update may resolve the issue by correcting communication errors between modules.
Is it safe to drive with code P1591 on a 2014 GMC Sierra?
Driving may be unsafe, as code P1591 can lead to reduced engine performance or erratic behavior, which could compromise vehicle control.
How much does it cost to repair code P1591 on a 2014 GMC Sierra?
Repair costs can vary widely depending on whether the issue is a simple wiring repair, BCM replacement, or software update, ranging from $100 to over $1,000.
Can disconnecting the battery clear code P1591 on a 2014 GMC Sierra?
Disconnecting the battery may temporarily clear the code, but it will likely return unless the underlying issue is resolved.
Should the BCM be replaced for code P1591 on a 2014 GMC Sierra?
Replacement may be necessary if the BCM is verified as faulty after thorough testing of wiring, connections, and software.
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