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Engine-Codes – GMC – P105A GMC

P105A GMC Code - Reductant Pump Low Speed

Quick Answer

The P105A diagnostic trouble code for GMC vehicles indicates an issue with the Reductant Pump Low Speed. Common causes include Faulty Reductant Pump: The most common cause of the P105A code is a malfunctioning reductant pump that is not operating at the required speed, Wiring Issues: Damaged or corroded wiring connections to the reductant pump can also trigger this code, Software Glitch: Sometimes, a software glitch in the vehicle's onboard computer can mistakenly trigger the P105A code. 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
P105A GMC indicates Reductant Pump Low Speed.
Common causes
Common causes include Faulty Reductant Pump: The most common cause of the P105A code is a malfunctioning reductant pump that is not operating at the required speed, Wiring Issues: Damaged or corroded wiring connections to the reductant pump can also trigger this code, Software Glitch: Sometimes, a software glitch in the vehicle's onboard computer can mistakenly trigger the P105A code.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 08, 2024
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Code P105A GMC Description

The P105A diagnostic trouble code for GMC vehicles indicates an issue with the Reductant Pump Low Speed. The reductant pump is a crucial component of the Selective Catalytic Reduction (SCR) system, which helps reduce harmful emissions in diesel engines. The reductant pump is responsible for supplying the Diesel Exhaust Fluid (DEF) to the SCR system to enable the conversion of nitrogen oxides into harmless nitrogen and water vapor.

OBDII Code P105A GMC - Reductant Pump Low Speed
P105A GMC Code - Reductant Pump Low Speed

Common Causes of P105A GMC

  1. Faulty Reductant Pump: The most common cause of the P105A code is a malfunctioning reductant pump that is not operating at the required speed.
  2. Wiring Issues: Damaged or corroded wiring connections to the reductant pump can also trigger this code.
  3. Software Glitch: Sometimes, a software glitch in the vehicle's onboard computer can mistakenly trigger the P105A code.
  4. Low DEF Fluid Levels: Insufficient DEF fluid in the tank can cause the reductant pump to operate at a lower speed.
  5. Environmental Factors: Extreme temperatures or exposure to contaminants can also affect the performance of the reductant pump.

Symptoms of P105A GMC

  1. Check Engine Light: The most common symptom associated with the P105A code is the illumination of the check engine light on the vehicle's dashboard.
  2. Reduced Engine Performance: The vehicle may experience reduced engine power or performance due to the inefficient emission control.
  3. Increased Emissions: The vehicle may produce higher emissions than usual, potentially failing emissions tests.
  4. Poor Fuel Economy: A malfunctioning reductant pump can lead to decreased fuel efficiency, resulting in more frequent refills at the gas station.

How to Fix P105A GMC

  1. Diagnose the Issue: Use a diagnostic scanner to retrieve the specific fault code and determine the root cause of the problem.
  2. Inspect the Reductant Pump: Check the reductant pump for any visible signs of damage or leaks. Ensure that it is receiving power and functioning properly.
  3. Check Wiring Connections: Inspect the wiring harness connected to the reductant pump for any damage or corrosion. Repair or replace any faulty wiring.
  4. Refill DEF Fluid: Ensure that the DEF tank is filled with an adequate amount of fluid to enable proper operation of the reductant pump.
  5. Clear Fault Codes: Once the issue has been resolved, clear the fault codes from the vehicle's computer to reset the check engine light.

Cost to Fix P105A GMC

The typical repair costs for addressing the P105A code related to the Reductant Pump Low Speed can range from $200 to $500, including parts and labor. However, specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It's recommended to inquire about local rates for a more accurate estimate.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P105A GMC Code

1. What are the common symptoms of OBDII code P105A GMC (Reductant Pump Low Speed)?

The common symptoms include poor engine performance, reduced fuel efficiency, and the illumination of the Check Engine Light.

2. What are the potential causes of OBDII code P105A GMC?

Potential causes of this code may include a faulty reductant pump, wiring issues, a defective reductant pump control module, or a problem with the reductant level sensor.

3. How can I diagnose OBDII code P105A GMC?

Diagnosing this code typically involves using a scan tool to retrieve the trouble code, inspecting the reductant pump and related components for any visible damage, and testing the wiring and connections for proper continuity.

4. What are some repair tips for addressing OBDII code P105A GMC?

Repair tips may include checking and replacing any damaged wiring or connectors, testing the reductant pump and control module for proper operation, and ensuring the reductant level sensor is functioning correctly.

5. Can I continue driving my vehicle with OBDII code P105A GMC?

It is not recommended to continue driving your vehicle with this code present, as it can lead to further damage and potential failure of emission control systems.

6. How serious is OBDII code P105A GMC?

While this code may not cause immediate drivability issues, it is important to address it promptly to prevent long-term damage to the vehicle's emissions system and ensure proper engine performance.

7. Will resetting the Check Engine Light clear OBDII code P105A GMC?

Resetting the Check Engine Light may temporarily turn it off, but if the underlying issue causing the P105A code is not addressed, the light is likely to come back on.

8. Can a DIY enthusiast fix OBDII code P105A GMC at home?

Depending on your skill level and access to tools, some DIY enthusiasts may be able to address this code at home by following repair guides and using diagnostic tools.

9. How much does it typically cost to repair OBDII code P105A GMC at a mechanic?

The cost of repairing this code can vary depending on the specific cause, but you can expect to pay for diagnostic time, parts, and labor, which may range from a few hundred to over a thousand dollars.

10. Is OBDII code P105A GMC covered under any warranties?

If your vehicle is still under warranty, the repair for this code may be covered, depending on the terms of your warranty. It's recommended to check with your dealership or warranty provider for more information.

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