P0956 code meaning
Auto Shift Manual Mode Circuit Range/Performance
Powertrain system Generic code P09xx codes Check engine light
What P0956 means
The manual mode signal is electrically valid but contradicts other information, for example manual mode reported while the range sensor reads P, R or N, or the mode switch never changing although the up/down requests arrive. A Hyundai patent uses a microswitch with two opposing contacts and treats identical or missing signals on both inputs as a defect; a Nissan patent likewise compares two contacts of the manual mode switch. No manufacturer documents this exact code publicly, and Hyundai's mode circuit fault is only documented as the general code P0955. CARB requires rationality checks on such inputs. P0957 to P0959 cover low, high and intermittent faults. Manual mode is usually blocked.
P0956 at a glance
- Check engine lightYes, usually on
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 2.5 hours
- Clears after repairAfter a drive cycle
Symptoms of P0956
- Manual mode drops out or will not engage
- Display shows manual mode while lever is in D, or the reverse
- Warning lamp depending on manufacturer
Common causes of P0956
- Most likelyMode switch or its actuating foot misaligned on the lever
- PossibleWorn switch contacts giving contradictory states on both inputs
- PossibleTransmission range sensor out of adjustment, disagrees with the mode signal
- Less likelyWorn selector lever bushings allowing side play
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Auto shift manual switchWiring harnessTCM
What each part of P0956 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 9 | Area: transmission. |
| 56 | The exact fault in that area. |
What to do next
- Note P0956 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 P0956
What does P0956 mean?
P0956 means "Auto Shift Manual Mode Circuit Range/Performance". The manual mode signal is electrically valid but contradicts other information, for example manual mode reported while the range sensor reads P, R or N, or the mode switch never changing although the up/down requests arrive. It is a generic code, so it means the same on every make.
Is it safe to drive with P0956?
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 P0956 fail an emissions test?
P0956 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 P0956 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P0956 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.