What Does P2537 Mean?
The PCM has detected a low voltage signal in the ignition switch ACCESSORY position circuit. This indicates the voltage from the ACC position is below normal operating threshold, suggesting high resistance or poor connections.
Common Causes
35%
Corroded or high-resistance connections at ignition switch connector
30%
Worn ignition switch with degraded ACC position contacts
20%
Poor ground connection in ignition switch circuit
10%
Damaged wiring or excessive voltage drop in ACC circuit
5%
Weak battery or low system voltage affecting switch operation
Diagnostic Steps
1
Step 1: Measure voltage at ignition switch ACC circuit with key in ACC position (should match battery voltage)
2
Step 2: Clean and inspect all ignition switch connector terminals for corrosion or damage
3
Step 3: Perform voltage drop test between battery positive and ACC circuit output (should be less than 0.5V)
4
Step 4: Check ground circuit integrity and verify low resistance to chassis ground
5
Step 5: Test ignition switch internal resistance in ACC position per manufacturer specifications
Estimated Repair Cost
$80 - $450
Parts + labor, varies by vehicle and location
The PCM has detected a low voltage signal in the ignition switch ACCESSORY position circuit. This indicates the voltage from the ACC position is below normal operating threshold, suggesting high resistance or poor connections.
The most common cause of P2537 (Ignition Switch Accessory Position Circuit Low) is: Corroded or high-resistance connections at ignition switch connector
Typical repair costs for P2537 range from $80 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Low safety impact. May cause accessories to not function properly in ACC position, but does not affect vehicle drivability or starting.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2537 to identify the root cause.
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Quick Info
Category
Powertrain
System
Ignition System / Accessory Power System
Difficulty
Type
Generic (SAE)
Recommended Tools
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