AutoCodes – GMC – P1051 GMC

P1051 GMC Code - Reductant Heater 1 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: P1051 GMC indicates Reductant Heater 1 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 598

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 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 P1051 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 P1051 GMC - Reductant Heater 1 Driver High Temperature - AutoCodes.com — P1051 GMC Code - Reductant Heater 1 Driver High Temperature

What does this mean?

What are the Possible Causes of the DTC P1051 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 P1051 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 P1051 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.

Need more information about the P1051 GMC code?

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Need Help with the Code?

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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 P1051 GMC Code

1. What are the common symptoms of OBDII code P1051 in a GMC vehicle?

The common symptoms include the check engine light coming on, reduced engine performance, and potential issues with the vehicle's exhaust system.

2. What is the likely cause of OBDII code P1051 in a GMC, indicating Reductant Heater 1 Driver High Temperature?

The most likely cause of this code is a malfunction in the reductant heater 1 driver circuit, leading to high temperature readings.

3. How can I diagnose the issue related to OBDII code P1051 in my GMC?

Diagnosing this issue typically involves checking the wiring and connections related to the reductant heater 1 driver circuit, as well as testing the heater itself for proper functionality.

4. Can I continue driving my GMC with OBDII code P1051 present?

It is not recommended to drive the vehicle with this code present, as it can lead to more serious issues with the exhaust system and emissions control.

5. What are some repair tips for fixing OBDII code P1051 in a GMC?

Repair tips may include checking and repairing any damaged wiring, replacing the reductant heater if necessary, and clearing the error code to see if the issue persists.

6. Is it possible to reset the OBDII code P1051 in a GMC without fixing the underlying issue?

While it is possible to clear the code temporarily, it is important to address the root cause of the problem to prevent further issues down the line.

7. How much does it typically cost to repair OBDII code P1051 in a GMC?

The cost of repair can vary depending on the exact cause of the issue, but it may involve replacing the reductant heater or repairing the wiring, which can range from moderate to high cost.

8. Can a DIY enthusiast fix OBDII code P1051 in a GMC, or is it better to take it to a professional mechanic?

While some DIY enthusiasts may attempt to fix this issue, it is recommended to consult a professional mechanic with experience in diagnosing and repairing emissions control system problems.

9. Are there any recalls or technical service bulletins related to OBDII code P1051 in GMC vehicles?

It is advisable to check with the manufacturer or authorized dealerships for any recalls or technical service bulletins related to this specific OBDII code in GMC vehicles.

10. How can I prevent OBDII code P1051 from recurring in my GMC after repair?

To prevent the code from recurring, it is essential to ensure proper maintenance of the vehicle's emissions control system, including routine inspections and timely repairs of any related issues.