AutoCodes – Land Rover – P1538 Land Rover

P1538 Land Rover Code - A/C Compressor Request High Input

Quick Answer

Request for Air Condition (A/C) operation is signaled to the Heating and Ventilation Air Conditioning (HVAC) control unit and Engine Control Module (ECM) when the A/C control panel switch is pressed, completing a ground path. Common causes include Faulty Air Condition (A/C) Compressor, Air Condition Compressor harness is open or shorted, Air Condition Compressor 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: P1538 Land Rover indicates A/C Compressor Request High Input.
Common causes: Common causes include Faulty Air Condition (A/C) Compressor, Air Condition Compressor harness is open or shorted, Air Condition Compressor 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 663

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Jan 19, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1538 Land Rover Description

Request for Air Condition (A/C) operation is signaled to the Heating and Ventilation Air Conditioning (HVAC) control unit and Engine Control Module (ECM) when the A/C control panel switch is pressed, completing a ground path. Battery voltage to A/C control panel switch is supplied via ECM connector. When an A/C operation request is received, the A/C compressor clutch will be engaged based on other operating requirements. If there is an A/C request failure, the A/C system will not work even if all other requirements are met.
The A/C compressor clutch relay is a 4-pin normally open relay located in the engine compartment fuse box. When the ECM grounds the A/C clutch relay coil the switching contacts close o allow the relay contacts to close and the A/C clutch to receive battery voltage. When the ECM opens the ground path, the clutch relay will be de-energized and shut down the A/C compressor clutch. Battery voltage to the A/C clutch relay is supplied via a fuse. Battery voltage to the A/C clutch relay coil is supplied from the main relay. A/C clutch relay coil ground is supplied via ECM. When the relay has energized the output from the switching contacts goes directly to the A/C compressor clutch. If there is an A/C clutch relay failure, the A/C system will not work even if all other requirements are met. If Diagnostic Trouble Code (DTC) P1538 is set, there is an A/C compressor operation request input signal that is too high caused by a short to battery voltage.

OBDII Code P1538 Land Rover - A/C Compressor Request High Input - AutoCodes.com — P1538 Land Rover Code - A/C Compressor Request High Input

What does this mean?

What are the Possible Causes of the DTC P1538 Land Rover?

Faulty Air Condition (A/C) Compressor
Air Condition Compressor harness is open or shorted
Air Condition Compressor circuit poor electrical connection

How to Fix the DTC P1538 Land Rover?

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 P1538 Land Rover 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 P1538 Land Rover code?

Need more information on how to fix the P1538 Land Rover code? Get Access to Factory Service Manuals

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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 P1538 Land Rover Code

1. What are the common symptoms of OBDII code P1538 in a Land Rover related to the A/C Compressor Request High Input?

- Common symptoms include the air conditioning system not working properly, insufficient cooling, or the A/C compressor not engaging when it should.

2. What are the possible causes of OBDII code P1538 in a Land Rover indicating A/C Compressor Request High Input?

- Potential causes can include a faulty A/C compressor clutch, a malfunctioning A/C compressor control module, wiring issues, or low refrigerant levels.

3. How can I diagnose the source of OBDII code P1538 in my Land Rover associated with A/C Compressor Request High Input?

- Diagnosis typically involves checking the A/C compressor clutch operation, inspecting wiring for damage, testing the A/C compressor control module, and verifying refrigerant levels.

4. Can OBDII code P1538 related to A/C Compressor Request High Input be cleared/reset without fixing the underlying issue?

- While you can clear the code temporarily, it is recommended to address the root cause to prevent long-term A/C system problems.

5. What repair tips can help resolve OBDII code P1538 in a Land Rover concerning A/C Compressor Request High Input?

- Repair tips may include inspecting and repairing damaged wiring, replacing a faulty A/C compressor clutch, resetting the A/C compressor control module, or recharging the refrigerant.

6. Are there any safety precautions to consider when diagnosing or repairing OBDII code P1538 in a Land Rover linked to A/C Compressor Request High Input?

- Safety precautions may include disconnecting the vehicle's battery before working on electrical components, using proper eye protection, and following manufacturer guidelines.

7. Can a DIY enthusiast with automotive knowledge fix OBDII code P1538 in a Land Rover tied to A/C Compressor Request High Input?

- Depending on the individual's skill level and access to tools, some DIY enthusiasts may be able to diagnose and repair this code, but professional assistance is recommended for complex issues.

8. How urgent is it to address OBDII code P1538 in a Land Rover regarding A/C Compressor Request High Input?

- While the vehicle may still be operational with this code, it is important to address it promptly to prevent further damage to the A/C system and ensure comfortable driving conditions.

9. Are there any recalls or service bulletins related to OBDII code P1538 in Land Rover models for A/C Compressor Request High Input?

- It's advisable to check with a Land Rover dealership or online resources for any relevant recalls or service bulletins specific to this OBDII code in your vehicle.

10. How much can I expect to pay for professional repairs of OBDII code P1538 in a Land Rover associated with A/C Compressor Request High Input?

- Repair costs can vary depending on the exact cause of the issue, but you may expect to pay anywhere from $200 to $800 for parts and labor, depending on the required repairs.