AutoCodes – Ford – P2042 Ford

P2042 Ford Code - Reductant Temperature Sensor Circuit

Quick Answer

The reductant heater and sender assembly contains pickup tube for reductant pump module, an electric heating element, a reductant temperature sensor and an electrode type level sensor. Common causes include Faulty Reductant Temperature Sensor, Reductant Temperature Sensor harness is open or shorted, Reductant Temperature Sensor 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: P2042 Ford indicates Reductant Temperature Sensor Circuit.
Common causes: Common causes include Faulty Reductant Temperature Sensor, Reductant Temperature Sensor harness is open or shorted, Reductant Temperature Sensor 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 1,973

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 Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2042 Ford Description

The reductant heater and sender assembly contains pickup tube for reductant pump module, an electric heating element, a reductant temperature sensor and an electrode type level sensor. The heating element is directly above pickup tubes inlet filter. When reductant temperature sensor detects the diesel exhaust fluid temperature dropping to the freezing point of 12°F (-11°C), the PCM will command the glow plug control module to provide voltage to heating element. The heating element thaws liquid reductant within reductant heater and sender assembly reservoir during cold ambient temperatures.

OBDII Code P2042 Ford - Reductant Temperature Sensor Circuit - AutoCodes.com — P2042 Ford Code - Reductant Temperature Sensor Circuit

What does this mean?

What are the Possible Causes of the DTC P2042 Ford?

Faulty Reductant Temperature Sensor
Reductant Temperature Sensor harness is open or shorted
Reductant Temperature Sensor circuit poor electrical connection

How to Fix the DTC P2042 Ford?

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 P2042 Ford 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 P2042 Ford code?

Need more information on how to fix the P2042 Ford code? Get Access to Factory Service Manuals

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Get the P2042 Ford code diagnosed by a professional: Find a repair shop in your area

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 P2042 Ford Code

1. What are the common symptoms of OBDII code P2042 in a Ford vehicle?

The common symptoms of OBDII code P2042 in a Ford vehicle include the malfunction indicator light (MIL) turning on, reduced engine performance, and potential issues with the exhaust system.

2. What does the OBDII code P2042 indicate in a Ford vehicle?

OBDII code P2042 in a Ford vehicle indicates a problem with the Reductant Temperature Sensor Circuit, specifically related to the reductant (DEF or AdBlue) system.

3. What are the possible causes of OBDII code P2042 in a Ford vehicle?

Possible causes of OBDII code P2042 in a Ford vehicle include a faulty reductant temperature sensor, damaged wiring or connectors in the sensor circuit, issues with the reductant heater, or a malfunctioning powertrain control module (PCM).

4. How can I diagnose the OBDII code P2042 in my Ford vehicle?

Diagnosing OBDII code P2042 in a Ford vehicle typically involves using a diagnostic scan tool to retrieve the specific fault code, checking the reductant temperature sensor and its circuit for any visible damage, and testing the sensor's resistance and voltage readings.

5. Can I continue driving my Ford vehicle with OBDII code P2042?

It is not recommended to continue driving your Ford vehicle with OBDII code P2042, as it can lead to reduced engine performance and potential damage to the reductant system components. It's best to address the issue promptly.

6. How can I repair OBDII code P2042 in my Ford vehicle?

Repairing OBDII code P2042 in a Ford vehicle may involve replacing the faulty reductant temperature sensor, repairing or replacing damaged wiring or connectors, addressing issues with the reductant heater, or reprogramming the PCM if necessary.

7. Is OBDII code P2042 a common issue in Ford vehicles?

OBDII code P2042 related to the Reductant Temperature Sensor Circuit is not extremely common in Ford vehicles, but it can occur due to sensor or system malfunctions. Regular maintenance and proper care of the reductant system can help prevent this issue.

8. Can I reset the OBDII code P2042 in my Ford vehicle on my own?

While you can clear the OBDII code P2042 using a diagnostic scan tool, it's important to address the underlying issue causing the fault code to prevent it from recurring. Clearing the code without fixing the problem may lead to further complications.

9. How much does it cost to repair OBDII code P2042 in a Ford vehicle?

The cost to repair OBDII code P2042 in a Ford vehicle can vary depending on the specific cause of the issue, the extent of the repairs needed, and labor costs. It's recommended to consult a professional mechanic for an accurate estimate.

10. Can a DIY enthusiast fix OBDII code P2042 in a Ford vehicle?

While some DIY enthusiasts may be able to diagnose and repair OBDII code P2042 in a Ford vehicle, it's a complex issue related to the reductant system. It's advisable to have the expertise and tools required for working on such components to ensure proper repair and avoid further damage.