P1591 2017 GMC Sierra Code - Body Control Module Engine Speed Request Signal Message Counter Incorrect
Quick Answer
The P1591 code on a 2017 GMC Sierra indicates that the Body Control Module (BCM) has detected an incorrect engine speed request signal message counter. Common causes include Faulty Wiring: Damaged or corroded wiring between the ECM and BCM can disrupt the communication signals, triggering the P1591 code, Malfunctioning ECM or BCM: A defective ECM or BCM can result in incorrect engine speed request signal message counters being sent, Software Glitch: An issue with the software programming of the BCM could cause it to misinterpret the engine speed request signals. 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 2017 GMC Sierra indicates Body Control Module Engine Speed Request Signal Message Counter Incorrect.
- Common causes
- Common causes include Faulty Wiring: Damaged or corroded wiring between the ECM and BCM can disrupt the communication signals, triggering the P1591 code, Malfunctioning ECM or BCM: A defective ECM or BCM can result in incorrect engine speed request signal message counters being sent, Software Glitch: An issue with the software programming of the BCM could cause it to misinterpret the engine speed request signals.
- 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 2017 GMC Sierra Description
The P1591 code on a 2017 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, door locks, and more. In this case, the BCM is not receiving the expected number of engine speed request signals, which could disrupt the communication between the engine control module (ECM) and other modules in the vehicle.
Common Causes of P1591 2017 GMC Sierra
- Faulty Wiring: Damaged or corroded wiring between the ECM and BCM can disrupt the communication signals, triggering the P1591 code.
- Malfunctioning ECM or BCM: A defective ECM or BCM can result in incorrect engine speed request signal message counters being sent.
- Software Glitch: An issue with the software programming of the BCM could cause it to misinterpret the engine speed request signals.
- Engine Speed Sensor Malfunction: A malfunctioning engine speed sensor can send inaccurate signals to the ECM, leading to the BCM receiving incorrect data.
Symptoms of P1591 2017 GMC Sierra
- Check Engine Light: The most obvious symptom of the P1591 code is the illumination of the check engine light on the vehicle's dashboard.
- Erratic Electrical Behavior: The vehicle may experience erratic behavior in electrical components controlled by the BCM, such as interior lighting, door locks, or window operation.
- Security System Malfunction: Issues with the vehicle's security system, such as the alarm not arming or disarming correctly, may be observed.
- Engine Performance Problems: The vehicle may exhibit issues related to engine performance, such as rough idling or hesitation during acceleration.
How to Fix P1591 2017 GMC Sierra
- Diagnose the Issue: Use a diagnostic scanner to retrieve the trouble code and perform a thorough inspection of the wiring, connections, ECM, BCM, and engine speed sensor to identify the root cause.
- Repair or Replace Wiring: If faulty wiring is the culprit, repair or replace the damaged or corroded wires to ensure proper communication between the ECM and BCM.
- Test and Reset Modules: After addressing the wiring or component issues, test the vehicle to ensure the code does not reappear. Reset the BCM and ECM modules to clear the code.
- Replace Faulty Components: If the ECM, BCM, or engine speed sensor is found to be faulty, replace the defective component with a new or refurbished unit to restore proper functionality.
- Perform a Final Test: After completing the repairs, test drive the vehicle to confirm that the issue has been resolved and no further codes are present.
Cost to Fix P1591 2017 GMC Sierra
The typical repair costs for addressing the P1591 code on a 2017 GMC Sierra can vary depending on the specific cause of the issue and the labor rates of the auto repair shop. In general, the cost of parts for this repair can range from $100 to $500, depending on the component that needs to be replaced. The labor costs can vary between $150 and $300, with the total cost typically falling in the range of $250 to $800.
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Frequently Asked Questions about P1591 2017 GMC Sierra Code
1. What does the OBDII code P1591 mean on a 2017 GMC Sierra?
P1591 indicates that the Body Control Module (BCM) has detected an issue with the engine speed request signal message counter, which may be incorrect or out of sync.
2. What are the common symptoms of code P1591 in a 2017 GMC Sierra?
Common symptoms include reduced engine performance, erratic idle, loss of cruise control functionality, or the vehicle entering limp mode.
3. What causes the P1591 code to appear in a 2017 GMC Sierra?
This code can be caused by faulty communication between the BCM and the Engine Control Module (ECM), wiring or connector issues, a failing BCM, or software glitches.
4. Can a faulty BCM cause the P1591 code in a 2017 GMC Sierra?
Yes, a malfunctioning BCM can cause incorrect signal message counters, leading to the P1591 code being triggered.
5. How can wiring issues lead to the P1591 code?
Damaged, corroded, or loose wiring or connectors between the BCM and ECM can disrupt communication, causing the message counter to be incorrect.
6. Is it safe to drive a 2017 GMC Sierra with the P1591 code?
While the vehicle may still be drivable, it could experience reduced performance or enter limp mode, so addressing the issue promptly is recommended.
7. How do you diagnose the P1591 code on a 2017 GMC Sierra?
Diagnosis typically involves scanning for codes, inspecting BCM and ECM wiring and connectors, and testing the communication signals between the modules.
8. Can software updates fix the P1591 code in a 2017 GMC Sierra?
In some cases, reprogramming or updating the BCM or ECM software can resolve the issue if it's caused by a software glitch.
9. What repairs are commonly needed for the P1591 code?
Repairs may include fixing or replacing damaged wiring, cleaning corroded connectors, reprogramming the BCM or ECM, or replacing a faulty BCM.
10. How much does it cost to fix the P1591 code on a 2017 GMC Sierra?
Repair costs vary depending on the issue, but diagnosing and addressing wiring or connection problems might cost $100-$300, while a BCM replacement can cost $400-$900 or more.
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