Powertrain, generic · Transmission

P0956 Auto Shift Manual Mode Circuit Range/Performance

Check engine lightOn
EmissionsNot relevant
Drive cycleRequired
Limp modeNo

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.

Likely causes

Mode switch or its actuating foot misaligned on the lever
Worn switch contacts giving contradictory states on both inputs
Transmission range sensor out of adjustment, disagrees with the mode signal
Worn selector lever bushings allowing side play

Symptoms

  • 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

Repair estimate

DifficultyMediumDIY possible
Parts and labour€50–600
Time0.5–2.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

auto shift manual switchwiring harnesstcm

Related codes

P0955P0957P0958P0959P0951P0705

References: law.cornell.edu, patents.google.com, patents.google.com.