Ignition Switch Accessory Position Circuit Low
The P2537 code indicates that the Powertrain Control Module (PCM) has detected a low voltage condition in the ignition switch accessory position circuit. This circuit supplies power to accessories like the radio, power windows, and climate control when the key is in the accessory position. A low voltage reading suggests a fault in the wiring, connector, or the ignition switch itself, which can cause intermittent or complete loss of accessory power.
1. Most Common Causes
- Faulty ignition switch
- Corroded or loose wiring/connectors in the accessory circuit
- Blown fuse or faulty relay
- Battery or charging system issue causing low voltage
2. Symptoms You Will Notice
- Accessories (radio, windows, etc.) not working in accessory position
- Intermittent accessory power loss
- Engine may not start or stall
- Dashboard warning lights illuminated
3. Step-by-Step Diagnosis
Step 1: Use a multimeter to check voltage at the ignition switch accessory terminal with key in ACC position (should be battery voltage).
Step 2: Inspect wiring and connectors for corrosion, damage, or looseness; repair as needed.
Step 3: Check fuses and relays related to the accessory circuit; replace if blown.
Step 4: Test the ignition switch for continuity and proper operation; replace if faulty.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended as the issue can cause loss of critical accessories and may lead to stalling or no-start conditions.
How much does it cost to fix?▼
Typically between $50 and $150 for parts and labor, depending on the specific cause and vehicle.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.