AutoCodes – GMC – P1F18 GMC

P1F18 GMC Code - Hybrid/EV Battery Pack Coolant Pump Enable Circuit

Quick Answer

The hybrid/EV battery pack coolant pump circulates coolant through the drive motor battery coolant radiator, drive motor battery coolant cooler and the hybrid/EV battery pack to control the temperature of the hybrid/EV battery pack. Common causes include Faulty Hybrid/EV Battery Pack Coolant Pump, Hybrid/EV Battery Pack Coolant Pump harness is open or shorted, Hybrid/EV Battery Pack Coolant Pump 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
P1F18 GMC indicates Hybrid/EV Battery Pack Coolant Pump Enable Circuit.
Common causes
Common causes include Faulty Hybrid/EV Battery Pack Coolant Pump, Hybrid/EV Battery Pack Coolant Pump harness is open or shorted, Hybrid/EV Battery Pack Coolant Pump 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 946
How popular is this code, among other codes? Low
Table of contents Created and updated by William Orellana on Apr 25, 2020
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Code P1F18 GMC Description

The hybrid/EV battery pack coolant pump circulates coolant through the drive motor battery coolant radiator, drive motor battery coolant cooler and the hybrid/EV battery pack to control the temperature of the hybrid/EV battery pack. An enable signal from the hybrid/EV powertrain control module 2 to the hybrid/EV battery pack coolant pump provides overall control of the pump. When this circuit is high, the pump can operate. The pump is controlled with a pulse-width modulated signal from the hybrid/EV powertrain control module 2 to the hybrid/EV battery pack coolant pump. The higher the duty cycle the higher the pump speed. The hybrid/EV battery pack coolant pump provides a hard-wired pulse-width modulated feedback signal to the hybrid/EV powertrain control module 2. During normal operation, this feedback signal provides pump speed information to the hybrid/EV powertrain control module 2. The hybrid/EV battery pack coolant pump has some self-diagnostic capability. If the hybrid/EV battery pack coolant pump determines there is an internal fault it provides this information on this same feedback circuit instead of pump speed information.
OBDII Code P1F18 GMC - Hybrid/EV Battery Pack Coolant Pump Enable Circuit - AutoCodes.com
P1F18 GMC Code - Hybrid/EV Battery Pack Coolant Pump Enable Circuit

What are the Possible Causes of the DTC P1F18 GMC?

  • Faulty Hybrid/EV Battery Pack Coolant Pump
  • Hybrid/EV Battery Pack Coolant Pump harness is open or shorted
  • Hybrid/EV Battery Pack Coolant Pump circuit poor electrical connection

How to Fix the DTC P1F18 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 P1F18 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 P1F18 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 P1F18 GMC Code

1. What are the common symptoms of OBDII code P1F18 in a GMC Hybrid/EV vehicle?

- Common symptoms include illuminated check engine light, reduced hybrid/EV system performance, and potential coolant pump failure.

2. What could be the possible causes of OBDII code P1F18 in a GMC Hybrid/EV vehicle?

- The code P1F18 typically indicates a fault in the Hybrid/EV battery pack coolant pump enable circuit, which can be caused by a malfunctioning coolant pump, wiring issues, or a faulty control module.

3. How can I diagnose the Hybrid/EV battery pack coolant pump enable circuit issue related to code P1F18 in my GMC vehicle?

- Diagnosis involves using a scan tool to retrieve the specific trouble code, performing a visual inspection of the coolant pump and related wiring, and testing the circuit for continuity and proper voltage.

4. Can I continue driving my GMC Hybrid/EV vehicle with OBDII code P1F18 present?

- It is not recommended to continue driving the vehicle with the code P1F18 present, as it can lead to further damage to the hybrid/EV system components.

5. What are some repair tips for resolving OBDII code P1F18 in a GMC Hybrid/EV vehicle?

- Repair tips include checking and repairing any damaged wiring, testing and potentially replacing the coolant pump, and reprogramming or replacing the control module if necessary.

6. How much does it typically cost to repair OBDII code P1F18 in a GMC Hybrid/EV vehicle?

- The cost of repairs for code P1F18 can vary depending on the extent of the issue, but it may involve parts replacement and labor costs that can range from a few hundred to over a thousand dollars.

7. Can I reset the OBDII code P1F18 in my GMC Hybrid/EV vehicle using a simple OBDII scanner?

- While you can clear the code using an OBDII scanner, it is important to address the underlying issue causing the code to prevent it from reoccurring.

8. Is OBDII code P1F18 specific to GMC Hybrid/EV vehicles only?

- The code P1F18 related to the Hybrid/EV battery pack coolant pump enable circuit is specific to GMC Hybrid/EV vehicles and may not apply to other vehicle makes and models.

9. What steps can I take to prevent OBDII code P1F18 from recurring in my GMC Hybrid/EV vehicle?

- Regular maintenance of the hybrid/EV system, including checking coolant pump operations and monitoring system performance, can help prevent the recurrence of code P1F18.

10. How long does it typically take to repair OBDII code P1F18 in a GMC Hybrid/EV vehicle?

- The repair time for code P1F18 can vary depending on the diagnostic process, parts availability, and the complexity of the repair, but it may take a few hours to a full day to complete the repair.

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