Powertrain, generic · Transmission

P0958 Auto Shift Manual Mode Circuit High

Check engine lightOn
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

The manual mode signal from the selector lever reads above its expected range. Possible causes are a short to supply voltage or, with an internally pulled-up input, an open circuit or missing switch ground that keeps the line high. A Nissan patent explains how two separately wired contacts let the control unit recognise a break in the manual mode switch, and a Hyundai patent shows the lever microswitch that reports the change from D to M. No manufacturer documents this exact code publicly; Hyundai's mode fault is only documented as P0955. CARB requires circuit checks on such inputs. P0957 is the low side, P0959 the intermittent variant. Usually the gearbox stays in automatic mode.

Likely causes

Broken mode signal wire or disconnected shifter plug
Missing ground at the mode switch
Mode signal shorted to a voltage-carrying wire

Symptoms

  • Manual gate has no effect, gearbox stays in automatic mode
  • Warning lamp depending on manufacturer
  • No manual gear shown on the display

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

P0955P0956P0957P0959P0953

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