Ignition Switch Accessory Position Circuit Low Voltage
The P2537 code indicates that the powertrain control module (PCM) has detected a low voltage condition in the ignition switch's 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 excessive resistance, a short to ground, or a failing ignition switch, which can cause intermittent or complete loss of accessory power.
01. Most Common Causes
- Faulty ignition switch
- Corroded or loose wiring/connectors in the accessory circuit
- Blown fuse or faulty relay for accessory power
- Short to ground in the accessory circuit
02. Symptoms You Will Notice
- Accessories (radio, windows, etc.) not working in accessory position
- Intermittent accessory power loss
- Engine may not start or stall
- Check Engine Light illuminated
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm code P2537 and check for related codes.
Step 2: Inspect the ignition switch and its wiring for damage, corrosion, or loose connections.
Step 3: Test voltage at the accessory circuit with the key in accessory position; should be near battery voltage.
Step 4: Check fuses and relays related to the accessory circuit.
Step 5: If wiring and fuses are good, replace the ignition switch.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended because the issue can cause accessories to fail and may lead to stalling or no-start conditions, posing a safety risk.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for parts and labor, depending on the vehicle and whether the ignition switch needs replacement.