P2533: Ignition Switch On/Start Position Circuit

P2533 is the general fault of the circuit that is live in both the on and the start position of the ignition switch, often called run/crank. Unlike the pure run line it must stay powered while the starter turns, so modules rely on it to remain awake during cranking. Ford lists P2533 in its 2014 BOSS 302S code table with the M marker for the MIL. Ford also published bulletin 21-2244 for 2021 Mustang Mach-E built before 7 July 2021: the MIL could come on with P061A, P1A1E and/or P2533 because of parameters in the powertrain control module, and the remedy is reprogramming the PCM and other modules. Wiring checks still come first on older vehicles. Low and high are P2534 and P2535.

Medium severity. Can I keep driving?Drive as little as possible. If you feel jerking or the light flashes, stop: a misfire can damage the catalytic converter.

Symptoms

MIL on
Possible no-start or stall during cranking

Most likely causes

Powertrain module software or parameters (Ford Mach-E 2021, reprogramming per TSB 21-2244)
Fuse or relay fault in the run/crank feed
Loose or corroded terminal at the module

What to check, in order

Start with the simplest. You can tick off each step.

Check the connector and wiring of the coil indicated
Check the condition of the spark plug
Swap the coil with another cylinder and see if the code changes
Measure the power supply and control signal using the manufacturer's wiring diagram

Good to know

Repair difficulty: medium

What each character of P2533 means

P: Powertrain: engine and transmission
2: Generic code: same on every make
5: Speed and idle
33: Specific fault in that system

Frequently asked questions

Can I keep driving with code P2533?

Drive as little as possible. If you feel jerking or the light flashes, stop: a misfire can damage the catalytic converter.

What causes code P2533?

The most common causes are: powertrain module software or parameters (Ford Mach-E 2021, reprogramming per TSB 21-2244); fuse or relay fault in the run/crank feed; loose or corroded terminal at the module.

Related codes

Sources

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.