P2537

Ignition Switch Accessory Position Circuit Low

Q: 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.

Q: Can I just clear P2537?

It returns until the switch or wiring fault is fixed. Clearing only resets the light.

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.

Real-world scan data

Seen in

scans in the past year

Found in

<0.1%

of scans

<0.1%

of scans that found faults

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

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.

Read & clear P2537 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX