P2537
Ignition Switch Accessory Position Circuit Low
Ignition switch circuit
Generic OBD-II
Medium
What it means
P2537 means the engine or body computer sees low voltage on the ignition switch's accessory-position circuit. This circuit tells the vehicle when the key is in the accessory position, so the fault usually traces to the ignition switch, its connector, or the wiring rather than to the engine itself.
Medium
Can I keep driving? Usually still drivable, but the computer isn't seeing the ignition switch accessory signal correctly, which can affect accessory power and, on some vehicles, starting behavior.
Common symptoms
What you'll notice
- Check-engine light on
- Accessory-powered items (radio, some circuits) may behave oddly
- Possible intermittent starting or key-position quirks on some vehicles
- Often no noticeable driving symptom
Common causes
Most likely first
- Faulty ignition switchLikely
- Short to ground or open in the accessory-position circuit wiringCommon
- Corroded or loose ignition switch connectorCommon
- Blown fuse feeding the accessory circuitLess often
- Rarely, an ECM/body control module faultLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and check the ignition switch input state with a scan tool across key positions.
- Inspect the ignition switch connector and accessory-circuit wiring for shorts, opens, or corrosion.
- Check the related fuse and confirm voltage in the accessory position.
- Test the ignition switch itself for correct contact in each position.
- Replace the ignition switch or repair wiring as indicated, then clear and re-test.
FAQ
Quick answers
Is it safe to drive with P2537?+
Usually yes, but starting or accessory power can become unreliable, so have the ignition switch circuit checked before it strands you.
Can I just clear P2537?+
It returns until the switch or wiring fault is fixed. Clearing only resets the light.
Related codes
Often seen with P2537
Read & clear P2537 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX