P162B 2016 GMC Sierra Code - Remote Vehicle Speed Limiting Signal Message Counter Incorrect
Quick Answer
When a remote slow-down request is sent from OnStar, the vehicle communication interface module sends a serial data message to the Engine Control Module (ECM) indicating that reduced vehicle speed has been requested. Common causes include Faulty Vehicle Communication Interface Module, Vehicle Communication Interface Module harness is open or shorted, Vehicle Communication Interface 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
- P162B 2016 GMC Sierra indicates Remote Vehicle Speed Limiting Signal Message Counter Incorrect.
- Common causes
- Common causes include Faulty Vehicle Communication Interface Module, Vehicle Communication Interface Module harness is open or shorted, Vehicle Communication Interface 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 P162B 2016 GMC Sierra Description
The Diagnostic Trouble Code (DTC) will be set when the VIN embedded in the slow-down request does not match the VIN stored in the ECM or the rolling code counter embedded in the slow-down request does not increment for ten consecutive messages.
What are the Possible Causes of the DTC P162B 2016 GMC Sierra?
- Faulty Vehicle Communication Interface Module
- Vehicle Communication Interface Module harness is open or shorted
- Vehicle Communication Interface Module circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P162B 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 P162B 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 P162B 2016 GMC Sierra Code
1. What does the OBDII code P162B mean on a 2016 GMC Sierra?
P162B indicates an issue with the Remote Vehicle Speed Limiting Signal Message Counter being incorrect, meaning the vehicle’s computer is detecting a mismatch or error in the signal related to speed limiting functions.
2. What are the common symptoms of the P162B code?
Symptoms may include the check engine light turning on, reduced engine performance, activation of a speed limiter, or issues with cruise control functionality.
3. What causes the P162B code to appear on a 2016 GMC Sierra?
The code is typically caused by faulty communication between the modules, a malfunctioning speed limiter control system, damaged wiring or connectors, or software issues in the control module.
4. Can a faulty vehicle speed sensor cause the P162B code?
While the speed sensor itself is not directly related, issues with the vehicle speed sensor could contribute to communication errors that trigger this code.
5. Is the P162B code serious?
Yes, it can be serious if it affects vehicle performance or safety systems. It should be diagnosed and repaired promptly to avoid further issues.
6. How is the P162B code diagnosed?
A technician will use a scan tool to check for related codes, inspect wiring and connectors for damage, and perform tests on the communication signals between the control modules.
7. How can I fix the P162B code on my 2016 GMC Sierra?
Repairs may involve updating module software, repairing or replacing damaged wiring, addressing faulty connectors, or replacing a malfunctioning control module.
8. Can the P162B code be triggered by a low battery?
Yes, a weak or low battery can cause communication issues between modules, potentially triggering this code.
9. Will clearing the code with a scanner fix the issue?
Clearing the code may temporarily turn off the check engine light, but the root cause must be addressed to prevent the code from returning.
10. How much does it cost to repair a P162B code on a 2016 GMC Sierra?
The cost varies depending on the root cause, but typical repairs can range from $150 to $500, including diagnostics, wiring repairs, or module updates.
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