P162B Buick 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 Buick 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 Buick 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 Buick?
- 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 Buick?
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 Buick 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 Buick Code
1. What does the OBDII code P162B mean in a Buick?
P162B indicates an issue with the Remote Vehicle Speed Limiting Signal Message Counter, where the data sent between control modules is incorrect or invalid.
2. What are common symptoms of the P162B code in a Buick?
Symptoms may include reduced engine power, activation of the check engine light, and limited vehicle speed functionality.
3. What causes the P162B code to appear in a Buick?
Common causes include faulty communication between control modules, a malfunctioning speed limiter module, damaged wiring, or software glitches.
4. Can a failing battery cause the P162B code in a Buick?
Yes, a weak or failing battery can cause communication errors between modules, potentially triggering the P162B code.
5. How can I diagnose the P162B code in my Buick?
Start by inspecting the wiring and connectors related to the speed limiter module and control modules. Use a scan tool to monitor communication data for inconsistencies.
6. Is the P162B code related to the vehicle’s speed limiter system?
Yes, it directly relates to the system that controls and monitors the vehicle’s speed-limiting functionality via remote signals.
7. Can the P162B code cause drivability issues in a Buick?
Yes, it can limit vehicle speed, reduce engine performance, or trigger limp mode, affecting drivability.
8. How do I fix the P162B code in my Buick?
Repairs may involve reprogramming the control module software, replacing a faulty speed limiter module, or repairing damaged wiring and connectors.
9. Can the P162B code be cleared without repairs?
Clearing the code without addressing the underlying issue may temporarily remove the check engine light, but the code is likely to return.
10. Is it safe to drive with the P162B code in my Buick?
Driving with this code may be unsafe if the vehicle enters limp mode or experiences reduced performance. It’s best to address the issue promptly.
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