AutoCodes – GMC – P1050 GMC

P1050 GMC Code - Reductant Level Sensor Invalid Range

Quick Answer

The reductant level sensor provides discrete information about the diesel exhaust fluid quantity present in the reductant tank. 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: P1050 GMC indicates Reductant Level Sensor Invalid Range.
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 4,518

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 P1050 GMC Description

The reductant level sensor provides discrete information about the diesel exhaust fluid quantity present in the reductant tank. The sensor signal provides information to the reductant control module to determine 4 different states: FULL, OK, WARNING1, and WARNING2. The reductant control module diagnoses the sensor for open circuit, short to ground and short to voltage electrical faults. The sensor is also checked for invalid range output by determining if the float is mechanically stuck in a plausible position. The Diagnostic Trouble Code (DTC) will be set when the reductant level sensor value is outside a calibrated range.

OBDII Code P1050 GMC - Reductant Level Sensor Invalid Range - AutoCodes.com — P1050 GMC Code - Reductant Level Sensor Invalid Range

What does this mean?

What are the Possible Causes of the DTC P1050 GMC?

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

How to Fix the DTC P1050 GMC?

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 P1050 GMC 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 P1050 GMC Code

1. What does the OBDII code P1050 mean on a GMC vehicle?

P1050 indicates "Reductant Level Sensor Invalid Range," meaning the vehicle's diesel exhaust fluid (DEF) level sensor is reporting values outside the expected range.

2. What are the common symptoms of the P1050 code on a GMC?

Symptoms may include a check engine light, DEF warning messages on the dashboard, reduced engine performance, or the vehicle entering limp mode.

3. What causes the P1050 code to appear on a GMC?

Common causes include a faulty DEF level sensor, wiring issues like damaged or corroded connectors, or a malfunction in the DEF tank or control module.

4. Can I drive my GMC with the P1050 code active?

Driving is possible but not recommended, as the vehicle may enter limp mode or face emission compliance issues if the DEF system is not functioning correctly.

5. How is the P1050 code diagnosed?

A mechanic will inspect the DEF level sensor, check for wiring or connector damage, and use a scan tool to monitor sensor readings and verify system operation.

6. How can I fix the P1050 code on my GMC?

Repairs may involve replacing the DEF level sensor, repairing damaged wiring, or cleaning connectors. In some cases, reprogramming or updating the control module may be necessary.

7. How much does it cost to fix the P1050 code on a GMC?

Repair costs can range from $200 to $600, depending on whether the DEF sensor needs replacement or if additional repairs, such as wiring fixes, are required.

8. Can a faulty DEF level sensor damage my GMC's engine?

While it won't directly damage the engine, ignoring the issue can lead to reduced performance, emission compliance problems, or the vehicle going into limp mode.

9. Is the P1050 code covered under warranty for GMC vehicles?

It depends on your vehicle's warranty. DEF system components may be covered under the emissions warranty, so check with your dealer.

10. Can I reset the P1050 code without fixing the problem?

Clearing the code without addressing the underlying issue may temporarily turn off the check engine light, but the code will likely return as the problem persists.