P0512 code meaning
Starter Request Circuit
Powertrain system Generic code P05xx codes Check engine light
What P0512 means
The engine module reads a start request – from the ignition switch, a start button via the body module, or start-stop – and drives the starter relay with it. P0512 flags a fault in this signal. Subaru (also in the Saab 9-2X) checks plausibility: if the engine runs above 500 rpm and the start signal stays active for more than 3 minutes, a short or sticking switch is assumed, MIL after two trips. On a Jeep Cherokee diesel a chafed harness caused P0512 with a no-start. The starter then does not crank – or with a short to positive keeps running.
P0512 at a glance
- Check engine lightYes, usually on
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 3 hours
- Clears after repairAfter a drive cycle
Symptoms of P0512
- Engine does not start, starter does not crank
- Starter keeps running after the start (noise)
- Check engine light (Subaru after two trips)
Common causes of P0512
- Most likelyIgnition or start switch, or start button, faulty or sticking
- PossibleHarness chafed, short to ground or positive
- Less likelySelector or clutch switch in the start path
- Less likelyStarter relay sticking
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Ignition start switchStarter relayStart request wiringEngine control module
What each part of P0512 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 5 | Area: vehicle speed, idle control and auxiliary inputs. |
| 12 | The exact fault in that area. |
What to do next
- Note P0512 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 P0512
What does P0512 mean?
P0512 means "Starter Request Circuit". The engine module reads a start request – from the ignition switch, a start button via the body module, or start-stop – and drives the starter relay with it. It is a generic code, so it means the same on every make.
Is it safe to drive with P0512?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P0512 fail an emissions test?
P0512 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 P0512 to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P0512 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.