P2536 code meaning
Ignition Switch Accessory Position Circuit
What P2536 means
P2536 is the general fault of the accessory input, the signal that is live when the key or start button is in the accessory position and that on many vehicles also acts as a wake-up line between body and powertrain modules. The code does not say whether the line is open, low or high, only that its state cannot be used. No manufacturer documents P2536 publicly. The best analogue is P2537, which GM evaluates in engine and transmission modules; in bulletin PIT5308 GM explains that the ECM and TCM receive a 12 V accessory wake-up from the body module on circuit 5985. A faulty accessory line can disable functions that need modules awake with the engine off, such as remote start. Low and high levels are P2537 and P2538.
P2536 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2536
- Remote start or key-off functions not working
- Accessories behave inconsistently in the accessory position
Common causes of P2536
- PossibleFault in the accessory feed or wake-up output of the body module
- PossibleLoose or corroded terminal on the accessory line
- Less likelyWorn accessory contact in the ignition switch
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Ignition switchWiring harness
What each part of P2536 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 5 | Area: vehicle speed, idle control and auxiliary inputs. |
| 36 | The exact fault in that area. |
What to do next
- Note P2536 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2536
What does P2536 mean?
P2536 means "Ignition Switch Accessory Position Circuit". P2536 is the general fault of the accessory input, the signal that is live when the key or start button is in the accessory position and that on many vehicles also acts as a wake-up line between body and powertrain modules. It is a generic code, so it means the same on every make.
Is it safe to drive with P2536?
P2536 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will P2536 fail an emissions test?
P2536 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is P2536 to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P2536 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.