AutoCodes – Buick – P1052 Buick

P1052 Buick 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 Buick 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 328

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

What does this mean?

What are the Possible Causes of the DTC P1052 Buick?

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 Buick?

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 Buick 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 Buick Code

What does the OBDII code P1052 mean on a Buick?

The P1052 code indicates an issue with the Reductant Heater 2 circuit, specifically a high temperature condition detected in its driver.

What are the common symptoms of the P1052 code?

Symptoms may include the check engine light turning on, poor DEF (Diesel Exhaust Fluid) system performance, and possible limp mode activation.

What causes the P1052 code to appear?

Common causes include a faulty reductant heater, damaged wiring or connectors in the heater circuit, or a malfunctioning engine control module (ECM).

Can I drive my Buick with the P1052 code?

It is not recommended to drive for an extended period with this code as it could lead to inefficiency in the SCR (Selective Catalytic Reduction) system and potential further damage.

How do I diagnose the P1052 code?

Diagnosis involves checking the reductant heater circuit for continuity, inspecting wiring and connectors for damage, and testing the heater's resistance using a multimeter.

How do I fix the P1052 code?

Repairs may include replacing the reductant heater, repairing or replacing damaged wiring, or reprogramming/repairing the ECM if necessary.

How much does it cost to fix the P1052 code?

Repair costs vary, but replacing a reductant heater typically costs $200-$600, depending on parts and labor costs.

Can a dirty DEF tank cause the P1052 code?

While unlikely, contamination in the DEF system can cause related issues. However, the P1052 code specifically points to a heater circuit problem.

Does the P1052 code require ECM replacement?

Not usually. ECM replacement is only necessary if it's confirmed to be the source of the issue after ruling out the reductant heater and wiring problems.

How can I prevent the P1052 code from recurring?

Regularly inspect and maintain the reductant heater system, check wiring for damage, and ensure the DEF system is free of contamination.