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P2537 OBD2: Ignition Switch Accessory Position Circuit Low

P2537 OBD2: Ignition Switch Accessory Position Circuit Low

What Does the P2537 Code Mean?

The P2537 OBD-II code indicates an issue with the Ignition Switch Accessory Position Circuit, specifically that the circuit voltage is too low when the vehicle is turned on. This code is primarily monitored by the Transmission Control Module (TCM), which ensures that all electrical systems receive the correct voltage.

What Causes the P2537 Code?

  • Ignition switch failure
  • Transmission Control Module (TCM) failure
  • Wiring issues

What Are the Symptoms of the P2537 Code?

  • Transmission may not shift properly

How Serious Is the P2537 Code?

This code is considered urgent. It indicates a significant malfunction that can lead to severe damage to the vehicle or pose safety risks to the driver and passengers. Immediate action is necessary to address this issue.

How to Diagnose the P2537 Code

Diagnosing the P2537 code involves the following steps:

  1. Check the vehicle’s battery voltage to ensure it is within the correct range.
  2. Inspect wiring and connectors related to the ignition switch and TCM for damage or corrosion.
  3. Test the ignition switch for proper operation.
  4. Perform a scan of the vehicle’s computer to check for any additional codes that may provide context.

Common Repairs for the P2537 Code

  • Ignition Switch Replacement (Electrical)

How Much Does It Cost to Fix the P2537 Code?

The cost to repair the P2537 code can vary widely depending on the specific issue. Replacing an ignition switch can range from $100 to $400, depending on the make and model of the vehicle and labor costs in your area.

Can I Fix the P2537 Code Myself?

While some DIY enthusiasts may be able to replace the ignition switch themselves, it is important to understand the risks involved. If you are not experienced with automotive electrical systems, it is advisable to seek professional help to ensure proper diagnosis and repair.

About JC Landry

JC spent 15+ years as a certified Master Mechanic before trading the shop for the keyboard. He's worked across dealerships, owned and operated his own independent garage, and consulted on automotive trade school curricula, reviewing technical textbooks used in vocational programs. He now serves as Editor-in-Chief at eManualOnline.com, where he oversees the platform's technical content. He's one of the few voices in automotive publishing who has actually turned wrenches professionally on the vehicles he covers. He didn't learn automotive repair to write about it. He learned to write after spending over a decade doing it.

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