AutoCodes – Cadillac – P1051 Cadillac

P1051 Cadillac 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 Cadillac 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 399

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 Cadillac 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 Cadillac - Reductant Heater 1 Driver High Temperature - AutoCodes.com — P1051 Cadillac Code - Reductant Heater 1 Driver High Temperature

What does this mean?

What are the Possible Causes of the DTC P1051 Cadillac?

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 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 P1051 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 P1051 Cadillac Code

1. What are common symptoms of OBDII code P1051 Cadillac (Reductant Heater 1 Driver High Temperature)?

Symptoms may include the check engine light illuminating, reduced engine power, and potential issues with the vehicle's emissions system.

2. What are possible causes of OBDII code P1051 Cadillac?

Potential causes may include a faulty reductant heater 1 driver, wiring issues, a malfunctioning reductant temperature sensor, or a problem with the powertrain control module.

3. How can I diagnose OBDII code P1051 Cadillac?

Diagnosis typically involves using a scan tool to read the code, checking the wiring and connections related to the reductant heater 1 driver, testing the reductant heater circuit, and inspecting the reductant temperature sensor.

4. Can I still drive my Cadillac with OBDII code P1051?

It is not recommended to drive your Cadillac with this code present, as it can lead to further damage to the emissions system and potentially affect the vehicle's performance.

5. How can I repair OBDII code P1051 Cadillac?

Repair options may include replacing the reductant heater 1 driver, repairing any damaged wiring, replacing the reductant temperature sensor, or addressing any issues with the powertrain control module.

6. Will resetting the fault codes make OBDII code P1051 Cadillac disappear?

Simply resetting the fault codes may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear after driving the vehicle for a certain period of time.

7. Can a DIY enthusiast fix OBDII code P1051 Cadillac?

Depending on the individual's level of automotive knowledge and skills, some DIY enthusiasts may be able to address this code by following repair guides and using the necessary tools and equipment.

8. How much does it typically cost to repair OBDII code P1051 Cadillac at a mechanic or dealership?

Costs can vary depending on the specific cause of the code and the labor rates of the service provider, but repairs for this code may range from a couple of hundred to a few hundred dollars.

9. Are there any preventative measures to avoid OBDII code P1051 Cadillac in the future?

Regular maintenance, such as checking and replacing worn-out components in the emissions system, can help prevent issues that may lead to the occurrence of this code.

10. Is OBDII code P1051 Cadillac a serious problem that requires immediate attention?

While the severity of the issue may vary, it is recommended to address this code promptly to prevent potential damage to the emissions system and ensure the vehicle operates efficiently.