AutoCodes – Cadillac – P105A Cadillac

P105A Cadillac Code - Reductant Pump Low Speed

Quick Answer

The reductant pump motor is controlled by the reductant control module. Common causes include Faulty Reductant Pump and Sensor Assembly, Reductant Pump and Sensor Assembly harness is open or shorted, Reductant Pump and Sensor Assembly 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: P105A Cadillac indicates Reductant Pump Low Speed.
Common causes: Common causes include Faulty Reductant Pump and Sensor Assembly, Reductant Pump and Sensor Assembly harness is open or shorted, Reductant Pump and Sensor Assembly 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.

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Code Popularity 609

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 24, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P105A Cadillac Description

The reductant pump motor is controlled by the reductant control module. The Engine Control Module (ECM) sends a command to the reductant control module via a direct wire connection. This command is converted by the reductant control module into the desired pump speed The ECM checks the state of the wire to the reductant control module for circuit continuity. The signal sent by the ECM to the reductant control module is diagnosed for open circuit, short circuit to ground, and short circuit to voltage. The Diagnostic Trouble Code (DTC) will be set when the reductant control module detects that the reductant pump rotor is stalled for greater than 5 s.

OBDII Code P105A Cadillac - Reductant Pump Low Speed - AutoCodes.com — P105A Cadillac Code - Reductant Pump Low Speed

What does this mean?

What are the Possible Causes of the DTC P105A Cadillac?

Faulty Reductant Pump and Sensor Assembly
Reductant Pump and Sensor Assembly harness is open or shorted
Reductant Pump and Sensor Assembly circuit poor electrical connection
Faulty Reductant Control Module

How to Fix the DTC P105A Cadillac?

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 P105A Cadillac 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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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 Cadillac Code

1. What are the common symptoms of OBDII code P105A in a Cadillac related to the Reductant Pump Low Speed?

- Common symptoms include the check engine light coming on, reduced engine performance, and potential issues with the vehicle's emissions system.

2. What could cause the Reductant Pump Low Speed code P105A in a Cadillac?

- The code P105A could be triggered by a faulty reductant pump, wiring issues, a defective reductant pump control module, or problems with the reductant fluid level sensor.

3. How can I diagnose the cause of the Reductant Pump Low Speed code P105A in my Cadillac?

- Diagnosing the code P105A involves checking the reductant pump and its wiring for any visible damage, testing the reductant pump control module, and inspecting the reductant fluid level sensor for proper operation.

4. What are the repair options for OBDII code P105A related to the Reductant Pump Low Speed in a Cadillac?

- Repair options include replacing the reductant pump, repairing any damaged wiring, replacing the reductant pump control module, or addressing any issues with the reductant fluid level sensor.

5. Can I continue driving my Cadillac with the Reductant Pump Low Speed code P105A?

- It is not recommended to continue driving with the code P105A active, as it can lead to further damage to the vehicle's emissions system and potentially affect engine performance.

6. How much does it typically cost to repair the Reductant Pump Low Speed code P105A in a Cadillac?

- The cost of repairing the code P105A can vary depending on the exact cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

7. Will resetting the check engine light make the Reductant Pump Low Speed code P105A go away?

- Resetting the check engine light may temporarily clear the code, but if the underlying issue causing the P105A code is not addressed, the check engine light is likely to come back on.

8. Are there any maintenance tips to prevent the Reductant Pump Low Speed code P105A in a Cadillac?

- Regularly checking and maintaining the reductant pump, its wiring, and the reductant fluid level sensor can help prevent issues that may trigger the P105A code.

9. Can a DIY enthusiast repair the Reductant Pump Low Speed code P105A in a Cadillac?

- Depending on the specific skills and tools available, some DIY enthusiasts may be able to address the issues related to the P105A code, such as replacing the reductant pump or checking wiring connections.

10. How urgent is it to address the Reductant Pump Low Speed code P105A in a Cadillac?

- It is recommended to address the P105A code as soon as possible to prevent potential damage to the vehicle's emissions system and ensure optimal engine performance.