Powertrain, generic · Transmission

P0957 Auto Shift Manual Mode Circuit Low

Check engine lightOn
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

Voltage in the manual mode circuit, the signal that reports the selector lever in the manual gate, is below the expected range. Mostly the signal line has a short to ground or the switch contact hangs in its grounded position. A Nissan patent describes a manual mode switch whose moving contact is grounded and explains how the control unit spots a contact shorted to earth from its two inputs. No manufacturer documents this exact code publicly; Hyundai's mode circuit fault appears in Genesis bulletins only as the general code. CARB requires circuit checks on such inputs. P0958 is the high counterpart, P0955 the general and P0956 the plausibility fault. Expect manual mode to be unavailable or stuck on.

Likely causes

Mode signal wire chafed and shorted to ground
Mode switch stuck in the grounded position
Liquid or dirt in the selector lever housing

Symptoms

  • Manual mode not available or permanently indicated
  • Warning lamp depending on manufacturer
  • Automatic driving in D unaffected

Repair estimate

DifficultyMediumDIY possible
Parts and labour€40–600
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

P0955P0956P0958P0959P0952

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