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Engine Fault Code P2537

Ignition Switch Accessory Position Circuit Low

Care Engine Code Reader
The engine fault code P2537 refers to an issue with the ignition switch accessory position circuit being too low. This code typically means that the vehicle`s computer has detected a problem with the signal coming from the ignition switch when it`s in the accessory position.

General Meaning:
– Ignition Switch Accessory Position Circuit Low: The vehicles computer is receiving a voltage that is lower than expected when the ignition switch is in the accessory position. This can affect the operation of various electrical systems.

Possible Causes:
– Faulty ignition switch
– Poor wiring or connections in the ignition circuit
– Issues with the vehicles body control module (BCM)
– Short circuits or open circuits in the wiring

Manufacturer-Specific Meanings:
While P2537 generally has the same meaning across different vehicles, some manufacturers might have unique interpretations or additional troubleshooting steps. Here are some possible variations:

1. Porsche: Similar to the general interpretation, but may also include specific checks for the ignition control module.
2. Mini: May indicate a need to check the vehicle`s electronic control unit (ECU) for software updates or compatibility issues.
3. Mercedes: Could involve checking the key fob battery or the key itself, as some models have advanced keyless entry systems.
4. Audi: Might require a scan tool to check for additional codes that could indicate related issues in the electrical system.
5. Jaguar: May suggest checking for issues with the instrument cluster, as it can be integrated with the ignition system.
6. Land Rover: Could involve more complex diagnostics due to the advanced electrical systems, potentially requiring specialized tools.

What to Do:
1. Inspect the Ignition Switch: Check for any visible damage or wear.
2. Check Wiring: Look for frayed or damaged wiring and ensure all connections are secure.
3. Scan for Additional Codes: Use an OBD-II scanner to check for any other related codes that might provide more context.
4. Consult a Professional: If the issue persists, it may be best to take the vehicle to a qualified mechanic who specializes in your specific make and model.

Always refer to the vehicle`s service manual for specific troubleshooting steps and wiring diagrams.
The Engine Fault Code P2537 indicates an issue with the ignition switch accessory position circuit being too low. This code can show up in various vehicles, including European brands like Porsche, Mini, Mercedes, Audi, Jaguar, and Land Rover. Here are some common causes for this code, along with any manufacturer-specific variations:

Common Causes:
1. Faulty Ignition Switch: The ignition switch itself may be defective, preventing the accessory position from functioning correctly.

2. Wiring Issues: Damaged or corroded wires in the ignition circuit can lead to low voltage readings. Check for frayed wires or bad connectors.

3. Poor Ground Connection: A bad ground connection can affect the circuit`s performance, causing a low voltage signal.

4. Battery Issues: A weak battery or poor battery connections can lead to insufficient voltage in the ignition circuit.

5. Faulty Relay: If the vehicle uses a relay for the accessory position, a faulty relay can cause this code.

Manufacturer-Specific Considerations:
Porsche: In some Porsches, the issue could be related to the steering column electronics, as they often have complex ignition systems.

Mini: Minis may experience this issue due to their unique keyless entry systems, which can sometimes interfere with the ignition switch.

Mercedes: In Mercedes vehicles, the issue might also stem from the Electronic Ignition Switch (EIS) system, which can fail and cause this code.

Audi: Audi models might have specific issues with the central electronic module that controls the ignition switch circuit.

Jaguar: Jaguars may have additional complications with their advanced keyless systems, which can lead to miscommunication with the ignition switch.

Land Rover: In Land Rovers, the problem might be linked to the Terrain Response system, which can affect the ignition circuit if there`s a fault.


If you encounter code P2537, it`s essential to start with a thorough inspection of the ignition switch, wiring, and connections. Depending on the make and model, you may need to consider manufacturer-specific components that could be causing the issue. Always consult a repair manual or a professional mechanic for detailed diagnostics tailored to your specific vehicle.
The engine fault code P2537 indicates a problem with the ignition switch accessory position circuit being too low. This can be somewhat common across various European car brands, including Porsche, Mini, Mercedes, Audi, Jaguar, and Land Rover. Heres how to troubleshoot and fix this issue, along with manufacturer-specific notes.

General Steps to Fix P2537:

1. Check the Battery:
– Ensure the battery is fully charged and in good condition. A weak battery can cause electrical issues.

2. Inspect the Ignition Switch:
– Look for any signs of wear or damage. If the ignition switch is faulty, it may need to be replaced.

3. Examine Wiring and Connectors:
– Check the wiring harness connected to the ignition switch for frays, corrosion, or loose connections. Repair or replace as necessary.

4. Test the Ignition Switch:
– Use a multimeter to test the ignition switch. Check for continuity in the accessory position. If theres no continuity, the switch may need replacement.

5. Check Fuses:
– Inspect the fuses related to the ignition system. Replace any blown fuses.

6. Scan for Other Codes:
– Use an OBD-II scanner to check for additional trouble codes. This can help identify if there are related issues.

7. Clear the Code:
– After making repairs, clear the code using an OBD-II scanner and see if it returns.

Manufacturer-Specific Notes:

Porsche:
– Check for software updates. Sometimes, a software issue can cause false codes.

Mini:
– Ensure to check the connection to the Body Control Module (BCM) as it may affect the ignition switch operation.

Mercedes:
– Look into the possibility of a faulty Electronic Ignition Switch (EIS). This component is crucial in newer models.

Audi:
– Audi vehicles may have a more complex wiring system. Ensure to follow the wiring diagrams specific to your model.

Jaguar:
– Some Jaguar models may have specific issues with the key fob or smart key system. Ensure the key is functioning properly.

Land Rover:
– Check for any software updates for the vehicle`s central electronics module, as this can sometimes resolve electrical faults.


Fixing the P2537 code involves a systematic approach to checking the ignition switch, wiring, and other related components. Always refer to the specific repair manual for your vehicle model for detailed instructions. If youre unsure or uncomfortable with any step, its best to consult a professional mechanic.
The P2537 code indicates an issue with the ignition switch accessory position circuit, which can affect the electrical systems in your car. While it might be safe to drive in the short term, it`s not recommended for a few reasons:

1. Electrical Systems: The accessory position controls things like the radio, power windows, and other electronic features. If these systems are not working properly, it can be inconvenient and distracting.

2. Starting Issues: If the ignition switch is malfunctioning, it might not allow the engine to start or could cause it to stall unexpectedly.

3. Potential for Further Damage: Ignoring the code could lead to more serious issues down the line, especially if the problem worsens.

Manufacturer-Specific Considerations:

Porsche: In Porsches, a faulty ignition switch can lead to more complex electrical problems. It`s best to have it checked quickly.

Mini: Mini vehicles often have integrated systems that rely heavily on the ignition switch. If you`re experiencing issues with starting or electrical features, it`s wise to address it soon.

Mercedes: Mercedes cars might show additional warning lights or issues with the dashboard. It`s crucial to diagnose the problem to avoid further complications.

Audi: Audis often have advanced electronic systems that could be impacted. If you notice any unusual behavior, get it checked.

Jaguar: Jaguars may experience erratic electrical behavior if the ignition switch is failing. It`s advisable to have it inspected to prevent potential breakdowns.

Land Rover: In Land Rovers, this code could affect off-road capabilities if electronic systems fail. Addressing the issue promptly is recommended.


While you might be able to drive with the P2537 code for a short time, it`s best to get it diagnosed and repaired as soon as possible to avoid any safety risks or further damage to your vehicle.

OBD Codes Explained

Engine Codes

P is for PowerTrain - Engine and Transmission.

P0 Indicates Generic Powertrain Codes

P0 Codes indicate problems with the powertrain and are common for all vehicles using the OBD-II Standard.

P1 Enhanced Manufacturer Specific Codes

P1 Codes are specific to manufacturers.

Sub-System

The 3rd Digit indicates the Sub-System

1 – Emission Management

2 – Injector Circuit

3 – Ignition

4 – Emission Control

5 – Vehicle Speed and Idle

6 – Computer and Output

7 – Transmission

8 – Transmission

9 – Reserved

0 – Reserved

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