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P1056 Chevrolet Code - Reductant Pump Low Speed

Quick Answer

The P1056 code for Chevrolet vehicles specifically refers to an issue with the Reductant Pump Low Speed. Common causes include Faulty reductant pump, Wiring issues or electrical faults, Clogged reductant pump filter. 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
P1056 Chevrolet indicates Reductant Pump Low Speed.
Common causes
Common causes include Faulty reductant pump, Wiring issues or electrical faults, Clogged reductant pump filter.
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 10, 2024
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Code P1056 Chevrolet Description

The P1056 code for Chevrolet vehicles specifically refers to an issue with the Reductant Pump Low Speed. The reductant pump is a crucial component of the selective catalytic reduction (SCR) system, which plays a key role in reducing harmful emissions from the vehicle. The reductant pump is responsible for supplying the necessary diesel exhaust fluid (DEF) to the SCR system, which then helps convert harmful nitrogen oxides (NOx) into harmless nitrogen and water vapor.

OBDII Code P1056 Chevrolet - Reductant Pump Low Speed
P1056 Chevrolet Code - Reductant Pump Low Speed

Common Causes of P1056 Chevrolet

  1. Faulty reductant pump
  2. Wiring issues or electrical faults
  3. Clogged reductant pump filter
  4. Low DEF fluid levels
  5. Software or calibration issues with the SCR system

Symptoms of P1056 Chevrolet

  1. Check engine light illuminated on the dashboard
  2. Decreased fuel efficiency
  3. Reduced power and acceleration
  4. Increased emissions output
  5. Difficulty starting the vehicle

How to Fix P1056 Chevrolet

  1. Diagnose the specific cause of the P1056 code using a diagnostic scanner to pinpoint the exact issue with the reductant pump.
  2. Inspect the wiring and electrical connections related to the reductant pump for any damage or corrosion.
  3. Check the DEF fluid levels and refill if necessary, ensuring that the reductant pump has an adequate supply to function properly.
  4. Clean or replace the reductant pump filter to remove any clogs that may be restricting flow.
  5. If the reductant pump itself is faulty, it may need to be replaced to resolve the issue completely.

Cost to Fix P1056 Chevrolet

The cost of repairing a P1056 code for a Chevrolet vehicle can vary depending on the specific cause of the issue and the extent of the repairs needed. On average, the cost of replacing a faulty reductant pump can range from $500 to $1000, including parts and labor. Additional costs may be incurred if other components of the SCR system need to be repaired or replaced. It's important to factor in diagnostic time and labor rates, which can vary between auto repair shops. It's advisable to consult with a professional mechanic to get an accurate estimate for your specific vehicle.

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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 P1056 Chevrolet Code

1. What are the common symptoms of OBDII code P1056 in a Chevrolet related to the Reductant Pump Low Speed?

The common symptoms include the illumination of the check engine light, reduced engine performance, and potential issues with the vehicle's emissions system.

2. What could be the possible causes of the OBDII code P1056 in a Chevrolet indicating Reductant Pump Low Speed?

Possible causes may include a faulty reductant pump, wiring issues, a malfunctioning reductant pump control module, or a problem with the reductant pump relay.

3. How can I diagnose the OBDII code P1056 in a Chevrolet related to the Reductant Pump Low Speed?

Diagnosis typically involves using a diagnostic scanner to retrieve the specific fault code, inspecting the reductant pump and its components for any visible damage, and testing the electrical connections for proper voltage and continuity.

4. Can I continue driving my Chevrolet if the OBDII code P1056 for Reductant Pump Low Speed is present?

It is not recommended to continue driving the vehicle with this fault code present, as it can lead to increased emissions, reduced fuel efficiency, and potential damage to other components in the emissions system.

5. What are some repair tips for addressing the OBDII code P1056 in a Chevrolet related to Reductant Pump Low Speed?

Repair tips may include checking and replacing the reductant pump if necessary, inspecting and repairing any damaged wiring or connections, resetting the fault code after repairs, and conducting a test drive to ensure the issue is resolved.

6. Is it possible to reset the OBDII code P1056 in a Chevrolet indicating Reductant Pump Low Speed without repairing the issue?

While you can clear the fault code with a diagnostic scanner, it is not recommended to do so without addressing the underlying problem, as it may lead to continued issues with the vehicle's emissions system.

7. How much does it typically cost to repair the OBDII code P1056 in a Chevrolet for Reductant Pump Low Speed?

Repair costs can vary depending on the exact cause of the issue, but they may range from a few hundred to over a thousand dollars, including parts and labor.

8. Can a DIY enthusiast fix the OBDII code P1056 in a Chevrolet related to Reductant Pump Low Speed?

While some DIY enthusiasts may be able to diagnose and address simpler causes of the code, it is recommended to consult a professional mechanic for proper diagnosis and repair, especially when dealing with emissions-related issues.

9. Will the OBDII code P1056 in a Chevrolet for Reductant Pump Low Speed affect the vehicle's overall performance?

Yes, the presence of this fault code can impact the vehicle's overall performance by reducing engine efficiency, increasing emissions output, and potentially triggering a limp mode to protect the engine.

10. How often does the OBDII code P1056 in a Chevrolet indicating Reductant Pump Low Speed occur?

The occurrence of this fault code can vary depending on the vehicle's age, maintenance history, and driving conditions, but it is relatively common in Chevrolet vehicles with emissions system issues.

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