P2B85 GMC Code - Engine Coolant Pump Underspeed
Quick Answer
The P2B85 diagnostic trouble code (DTC) for GMC vehicles indicates that the engine coolant pump is running at an underspeed. Common causes include Faulty engine coolant pump, Low coolant level, Electrical issues with the coolant pump. 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
- P2B85 GMC indicates Engine Coolant Pump Underspeed.
- Common causes
- Common causes include Faulty engine coolant pump, Low coolant level, Electrical issues with the coolant pump.
- 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.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code P2B85 GMC Description
The P2B85 diagnostic trouble code (DTC) for GMC vehicles indicates that the engine coolant pump is running at an underspeed. This means that the engine coolant pump, which is responsible for circulating coolant through the engine to maintain optimal operating temperature, is not functioning at the expected speed. This can lead to inadequate cooling of the engine, potentially causing overheating and other issues.
Common Causes of P2B85 GMC
- Faulty engine coolant pump
- Low coolant level
- Electrical issues with the coolant pump
- Cooling system blockage
- Engine belt issues
Symptoms of P2B85 GMC
- Engine overheating
- Reduced engine performance
- Increased coolant consumption
- Check engine light illuminated
How to Fix P2B85 GMC
- Inspect the coolant pump for any signs of damage or wear.
- Check the coolant level and top off if necessary.
- Test the electrical connections to the coolant pump for any faults.
- Inspect the cooling system for any blockages or leaks.
- Replace the engine coolant pump if deemed necessary.
Cost to Fix P2B85 GMC
The cost of repairing an engine coolant pump underspeed issue can vary depending on the specific cause of the problem and the make and model of the vehicle. On average, the cost of replacing an engine coolant pump can range from $200 to $600, including parts and labor. However, this cost can fluctuate based on the severity of the issue and the rates charged by the auto repair shop. As mentioned earlier, it's advisable to check with local repair shops for a more precise estimate.
Tech Notes for P2B85 GMC
Technical Article: Water Pump Failure and DTC P2B85
Need more information about the P2B85 GMC code?
Need more information on how to fix the P2B85 GMC code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P2B85 GMC code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P2B85 GMC Code
What does the OBDII code P2B85 mean on a GMC vehicle?
The P2B85 code indicates that the engine coolant pump is operating at a speed lower than expected, which may affect proper cooling system performance.
What are the common symptoms of the P2B85 code?
Symptoms may include engine overheating, an illuminated check engine light, reduced engine performance, and unusual noises from the coolant pump area.
What causes the P2B85 code to appear?
Common causes include a failing engine coolant pump, a faulty pump motor, electrical issues like damaged wiring or connectors, or a malfunctioning engine control module (ECM).
Can I keep driving with the P2B85 code active?
It is not recommended, as continued driving with this code could lead to engine overheating and potentially severe engine damage.
How is the P2B85 code diagnosed?
A mechanic will inspect the coolant pump, test the electrical circuit, check for proper pump operation, and use a scan tool to monitor system data and confirm the issue.
How can the P2B85 code be fixed?
Repairs may include replacing the coolant pump, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the ECM if necessary.
How much does it cost to fix the P2B85 code?
Costs vary depending on the underlying issue, but replacing an engine coolant pump typically ranges from $300 to $700, including parts and labor.
Can a faulty thermostat cause the P2B85 code?
A faulty thermostat is unlikely to trigger this code, as it specifically relates to the coolant pump’s speed rather than coolant flow regulation.
Is the P2B85 code specific to GMC vehicles?
While P2B85 is more commonly seen in GMC vehicles, it can also appear in other vehicles that use similar cooling system designs.
Does resetting the check engine light fix the P2B85 code?
No, resetting the light will not fix the underlying issue. The root cause of the code must be diagnosed and repaired to prevent it from returning.
Discuss the causes and fixes for P2B85 GMC OBDII Code
Code P2B85 GMC comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.