Powertrain, generic · Transmission

P0918 Gear Shift Position Circuit A Intermittent

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

Flags a gear shift position signal on circuit A that drops out or jumps for short moments in an automated manual gearbox. The module sees implausible steps or brief losses that are too short or too irregular for a lasting low or high fault. Typical triggers are terminals that lose contact under vibration, a chafed harness moving with the powertrain, or moisture at the actuator connector. No manufacturer documents this code publicly. Patents from Aisin AI and Nissan/Aichi show the shift stroke sensor as the feedback that confirms an engaged gear. CARB requires circuit checks on such inputs. P0914, P0916 and P0917 are the steady electrical faults of circuit A, P0915 the plausibility fault. Shifts may abort or the gearbox may briefly fall back to neutral.

Likely causes

Connector at the shift sensor or actuator unit losing contact under vibration
Chafed or partially broken sensor wire near the gearbox
Moisture or corrosion in the connector
Shift position sensor with an internal contact or track fault

Symptoms

  • Warning light comes and goes
  • Gear changes abort now and then or the gearbox drops to neutral
  • Fault often appears on rough roads or in wet weather

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–1,200
Time0.5–4 h

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

Parts involved

gear shift position sensor awiring harnesstcm

Related codes

P0914P0915P0916P0917P0919P091A

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