P1591 2016 GMC Sierra Code - Body Control Module Engine Speed Request Signal Message Counter Incorrect
Quick Answer
Control modules connected to the serial data circuits monitor the communication during normal vehicle operation. Common causes include Faulty Body Control Module, Body Control Module harness is open or shorted, Body Control Module circuit poor electrical connection. 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 2016 GMC Sierra indicates Body Control Module Engine Speed Request Signal Message Counter Incorrect.
- Common causes
- Common causes include Faulty Body Control Module, Body Control Module harness is open or shorted, Body Control Module circuit poor electrical connection.
- 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.
Code P1591 2016 GMC Sierra Description
What are the Possible Causes of the DTC P1591 2016 GMC Sierra?
- Faulty Body Control Module
- Body Control Module harness is open or shorted
- Body Control Module circuit poor electrical connection
How to Fix the DTC P1591 2016 GMC Sierra?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1591 2016 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P1591 2016 GMC Sierra Code
1. What does the OBDII code P1591 mean on a 2016 GMC Sierra?
P1591 indicates that the Body Control Module (BCM) has detected an issue with the engine speed request signal message counter, meaning the signal from the BCM to the Engine Control Module (ECM) is not functioning correctly.
2. What are the common symptoms of code P1591 in a 2016 GMC Sierra?
Symptoms may include erratic shifting, reduced engine performance, a check engine light, or communication errors between the BCM and ECM.
3. What causes the P1591 code to appear on a 2016 GMC Sierra?
Common causes include a faulty Body Control Module (BCM), wiring or connector issues, a malfunctioning Engine Control Module (ECM), or software glitches in the communication system.
4. Can a failing BCM cause the P1591 code?
Yes, a failing BCM can cause this code, as it may not properly communicate the engine speed request signal to the ECM.
5. How can I diagnose the P1591 code on my 2016 GMC Sierra?
Start by scanning for additional trouble codes, inspecting the BCM and ECM connectors and wiring for damage, and using a diagnostic tool to monitor signal data between the modules.
6. Is it safe to drive with the P1591 code on a 2016 GMC Sierra?
Driving with this code may lead to reduced performance or erratic behavior, which could pose safety risks. It’s best to address the issue promptly.
7. How can I fix the P1591 code on my 2016 GMC Sierra?
Repairs may include reprogramming or replacing the BCM or ECM, repairing or replacing damaged wiring or connectors, or updating software to resolve communication errors.
8. Can a software update fix the P1591 code?
Yes, in some cases, a software update for the BCM or ECM can resolve the communication issue causing the code.
9. What tools do I need to troubleshoot the P1591 code?
You’ll need an OBDII scanner with advanced diagnostic capabilities, a multimeter for testing wiring, and possibly manufacturer-specific software for programming or updates.
10. How much does it cost to fix the P1591 code on a 2016 GMC Sierra?
Repair costs can vary widely, ranging from $100 for wiring repairs to $600 or more for module replacement and programming.
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