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P1E45 GMC Code - 14 Volt Power Module Temperature Sensors 1-2 Not Plausible

Quick Answer

The P1E45 diagnostic trouble code (DTC) for GMC vehicles specifically relates to the 14 Volt Power Module Temperature Sensors 1-2 Not Plausible. Common causes include Faulty temperature sensors 1 or 2 within the 14 Volt Power Module, Wiring issues, such as a short circuit or loose connection, affecting the sensors' readings, Corrosion or damage to the connectors or terminals of the temperature sensors. 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
P1E45 GMC indicates 14 Volt Power Module Temperature Sensors 1-2 Not Plausible.
Common causes
Common causes include Faulty temperature sensors 1 or 2 within the 14 Volt Power Module, Wiring issues, such as a short circuit or loose connection, affecting the sensors' readings, Corrosion or damage to the connectors or terminals of the temperature sensors.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 11, 2024
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Code P1E45 GMC Description

The P1E45 diagnostic trouble code (DTC) for GMC vehicles specifically relates to the 14 Volt Power Module Temperature Sensors 1-2 Not Plausible. This code indicates that there is a discrepancy between the readings from the temperature sensors 1 and 2 within the 14 Volt Power Module. The 14 Volt Power Module is a crucial component in the vehicle's electrical system responsible for regulating and distributing power to various systems and components. The temperature sensors play a vital role in monitoring the temperature of the module to prevent overheating and ensure proper functioning.

OBDII Code P1E45 GMC - 14 Volt Power Module Temperature Sensors 1-2 Not Plausible
P1E45 GMC Code - 14 Volt Power Module Temperature Sensors 1-2 Not Plausible

Common Causes of P1E45 GMC

  1. Faulty temperature sensors 1 or 2 within the 14 Volt Power Module.
  2. Wiring issues, such as a short circuit or loose connection, affecting the sensors' readings.
  3. Corrosion or damage to the connectors or terminals of the temperature sensors.
  4. Internal circuitry problems within the 14 Volt Power Module.
  5. Overheating of the power module due to external factors or high electrical load.

Symptoms of P1E45 GMC

  1. Erratic electrical behavior, such as flickering lights or malfunctioning electrical components.
  2. Reduced power output from the vehicle's electrical systems.
  3. Check Engine Light (CEL) or other warning lights illuminated on the dashboard.
  4. Difficulty starting the vehicle or issues with the battery charging.

How to Fix P1E45 GMC

  1. Begin by conducting a visual inspection of the temperature sensors, wiring, and connectors for any visible damage or corrosion.
  2. Use a multimeter to test the resistance of the temperature sensors to determine if they are functioning correctly.
  3. Check the wiring harness for continuity and repair any damaged wires or connections.
  4. If the sensors are found to be faulty, replace them with OEM or high-quality aftermarket sensors.
  5. Clear the DTC and perform a test drive to ensure that the issue has been resolved.

Cost to Fix P1E45 GMC

The typical repair costs for addressing the P1E45 code can vary depending on the extent of the issue and the specific components that require replacement. In general, replacing the temperature sensors and addressing any wiring issues may cost between $200 to $500, including parts and labor. However, it's important to note that diagnosis time and labor rates at auto repair shops can fluctuate based on various factors, so it's recommended to obtain a personalized estimate from a trusted mechanic or dealership. Keep in mind that rates in metropolitan areas or at dealerships may be higher, while independent shops often offer more competitive pricing.

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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 P1E45 GMC Code

1. What does the OBDII code P1E45 mean on a GMC vehicle?

Code P1E45 indicates an issue with the 14 Volt Power Module, where temperature sensors 1 and 2 are providing readings that are not plausible or consistent with one another.

2. What are the common symptoms of GMC code P1E45?

Symptoms may include an illuminated check engine light, reduced charging system performance, poor fuel efficiency, or issues with the vehicle's electrical system.

3. What causes the P1E45 code to trigger?

This code can be caused by faulty temperature sensors, wiring issues, a defective 14 Volt Power Module, or software/communication errors in the vehicle's control modules.

4. Can I continue driving with a P1E45 code?

While the vehicle may still be drivable, ignoring this code can lead to further damage to the 14 Volt Power Module or other electrical components. It’s best to address the issue promptly.

5. How is the P1E45 code diagnosed?

Technicians diagnose this code by using a scan tool to check for additional codes, inspecting the wiring and connections, testing the temperature sensors, and verifying the functionality of the 14 Volt Power Module.

6. What repairs can resolve the P1E45 code on a GMC?

Repairs may include replacing faulty temperature sensors, repairing or replacing damaged wiring, updating the vehicle’s software, or replacing the 14 Volt Power Module if it is defective.

7. How much does it cost to fix the P1E45 code?

Repair costs vary depending on the specific issue, but sensor replacement typically costs $150–$300, while replacing the 14 Volt Power Module can cost $500–$1,000 or more.

8. Can a weak battery cause the P1E45 code?

While a weak battery is not a direct cause of this code, it can contribute to electrical system malfunctions that exacerbate the issue. A battery test is recommended during diagnosis.

9. Is the P1E45 code specific to GMC vehicles?

Yes, this code is specific to GMC vehicles and relates to the 14 Volt Power Module system used in certain GMC models.

10. Do I need to update my vehicle’s software to fix the P1E45 code?

In some cases, updating the vehicle’s control module software may resolve communication errors or incorrect readings, so it is worth considering during diagnosis.

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