Powertrain, generic · Transmission

P0955 Auto Shift Manual Mode Circuit

Check engine lightOn
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

Fault in the circuit that tells the transmission control whether the driver has moved the selector lever from D into the manual gate. A Nissan patent shows a dedicated manual mode switch with two contacts on separate inputs, so a break or a short to ground can be told apart; a Hyundai patent uses a microswitch on the lever. Genesis bulletins for 2017-18 G80 and G90 automatics list Auto Shift Manual Mode Circuit for the cable-shift version, with a check engine light and a part from the shift lever group as repair, though the table prints the code as P0995 and P095500. So at least Hyundai uses ASM for the manual mode of a torque converter automatic. P0956 to P0959 are the detailed variants, P0950 the up/down request circuit.

Likely causes

Failed manual mode switch or microswitch in the selector lever
Corroded or loose connector at the selector lever assembly
Damaged wiring between selector lever and transmission control module

Symptoms

  • Manual mode cannot be selected or is not displayed
  • Check engine or transmission warning light on
  • Driving in D remains possible

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

P0956P0957P0958P0959P0950P0705

References: static.nhtsa.gov, patents.google.com, patents.google.com.