P162B 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 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 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?
- 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?
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 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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Information for Specific Makes
- P162B Buick — Remote Vehicle Speed Limiting Signal Message Counter Incorrect
- P162B Cadillac — Remote Vehicle Speed Limiting Signal Message Counter Incorrect
- P162B Chevrolet — Remote Vehicle Speed Limiting Signal Message Counter Incorrect
- P162B GMC — Remote Vehicle Speed Limiting Signal Message Counter Incorrect
Frequently Asked Questions about P162B Code
1. What are the common symptoms of OBDII code P162B?
- The common symptoms include the vehicle's speed being limited, reduced engine power, and the check engine light being illuminated.
2. What causes the OBDII code P162B to occur?
- The code is typically triggered when the remote vehicle speed limiting signal message counter is incorrect or inconsistent, often due to issues with the speed limiting system or communication errors.
3. How can I diagnose the root cause of OBDII code P162B?
- Diagnosing the issue involves checking the speed limiting system components, inspecting wiring for damage or loose connections, and using a diagnostic scanner to monitor the speed limiting signal messages.
4. Is it safe to continue driving with OBDII code P162B active?
- It is not recommended to drive with the code active as the speed limiting feature may compromise the vehicle's performance and safety. It's best to address the issue promptly.
5. What are some repair tips for resolving OBDII code P162B?
- Repair tips include checking and repairing any damaged wiring, ensuring all connections are secure, resetting the system, and updating any related software or modules.
6. Can a DIY enthusiast fix OBDII code P162B at home?
- While basic troubleshooting like checking connections and resetting the system can be done at home, resolving the code may require specialized tools and expertise, making it advisable to consult a professional mechanic.
7. How much does it typically cost to repair OBDII code P162B?
- The cost of repair can vary depending on the underlying issue, but it may involve expenses for diagnostics, parts replacement, and labor, typically ranging from $100 to $500 or more.
8. Are there any preventive measures to avoid OBDII code P162B in the future?
- Regular maintenance, such as inspecting wiring and connectors, keeping software up to date, and addressing speed limiting system issues promptly, can help prevent the recurrence of the code.
9. Can OBDII code P162B affect vehicle performance?
- Yes, the code can impact vehicle performance by limiting speed and engine power, potentially leading to driving difficulties and safety concerns.
10. How urgent is it to address OBDII code P162B once detected?
- It is recommended to address the code promptly to prevent any safety hazards, performance issues, or potential damage to the vehicle that may arise from the incorrect speed limiting signal message counter.
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