AutoCodes – GMC – P1052 GMC

P1052 GMC Code - Reductant Heater 2 Driver High Temperature

Quick Answer

As reductant will freeze at temperatures below -11°C (12°F), there are 2 reductant heaters. Common causes include Faulty Reductant Line Heater, Reductant Line Heater harness is open or shorted, Reductant Line Heater 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: P1052 GMC indicates Reductant Heater 2 Driver High Temperature.
Common causes: Common causes include Faulty Reductant Line Heater, Reductant Line Heater harness is open or shorted, Reductant Line Heater 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 469

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 P1052 GMC Description

As reductant will freeze at temperatures below -11°C (12°F), there are 2 reductant heaters. Reductant heater 1 is integral to the Emission Reduction Fluid Supply Pump Module, located in the reductant tank. Reductant heater 2 is located in the supply line to the reductant injector. The Engine Control Module (ECM) monitors the reductant temperature in the tank in order to determine if the fluid is below its freeze point. If the ECM determines that the reductant may be frozen, it activates a "defrost strategy", by energizing the reductant heaters. The heaters are deactivated when the fluid temperature exceeds a calibrated value. The Diagnostic Trouble Code (DTC) will be set when the ECM indicates the reductant tank heater temperature is over the calibrated threshold for greater than 5 s.

OBDII Code P1052 GMC - Reductant Heater 2 Driver High Temperature - AutoCodes.com — P1052 GMC Code - Reductant Heater 2 Driver High Temperature

What does this mean?

What are the Possible Causes of the DTC P1052 GMC?

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

How to Fix the DTC P1052 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 P1052 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 P1052 GMC Code

1. What does the OBDII code P1052 mean on a GMC vehicle?

P1052 indicates an issue with the Reductant Heater 2 circuit, specifically that the driver is detecting a high temperature condition.

2. What are the common symptoms of the P1052 code?

Symptoms include the Check Engine Light being illuminated, issues with the diesel exhaust fluid (DEF) system, and possible difficulty meeting emissions standards.

3. What causes the P1052 code to be triggered?

Common causes include a malfunctioning reductant heater, damaged wiring, poor electrical connections, or a failure in the reductant control module.

4. Can you drive with the P1052 code active?

While the vehicle may still be driveable, prolonged driving with this code can lead to increased emissions and potential DEF system failure.

5. How is the P1052 code diagnosed?

A mechanic will typically use a scan tool to confirm the code, inspect the DEF system heater and wiring, and test the reductant heater circuit for continuity and resistance.

6. What repairs can fix the P1052 code?

Repairs may include replacing the reductant heater, repairing or replacing damaged wiring or connectors, or replacing the reductant control module if necessary.

7. How much does it cost to fix the P1052 code?

The cost varies, but replacing a reductant heater can range from $200 to $500, depending on labor and parts costs.

8. Can a bad reductant heater cause other problems?

Yes, a faulty reductant heater can prevent the DEF system from functioning properly, leading to increased emissions and potential limp mode activation.

9. Is the P1052 code specific to GMC vehicles?

The P1052 code is not exclusive to GMC but may appear on other diesel vehicles with similar DEF systems. However, diagnostic and repair steps may vary.

10. How can I prevent the P1052 code from occurring?

Regular maintenance of the DEF system, inspecting wiring for damage, and using high-quality DEF fluid can help prevent this issue.