Powertrain, generic · Transmission

P0934 Hydraulic Pressure Sensor Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

The pressure sensor signal sits below its valid window. Chrysler RFE transmissions feed the line pressure sensor with a 5 V reference and expect 0.35 to 4.75 V; P0934 sets when the signal stays at or below 0.35 V for 0.18 s, monitored continuously with the engine running. Typical reasons are a signal wire shorted to ground, a lost 5 V reference or a failed sensor. Ferrari also uses P0934 on its DCT, described as hydraulic pressure sensor signal too low. P0935 is the opposite high fault, P0932 the general circuit fault, P0933 plausibility and P0936 intermittent. Without a usable pressure signal the control usually raises pressure to a safe maximum, so shifts turn harsh.

Likely causes

Sensor signal wire shorted to ground
5 V reference open or shorted
Pressure sensor or the solenoid pack carrying it failed
Control module fault

Symptoms

  • Warning light on
  • Harsh shifts due to default maximum pressure
  • Possible limp mode

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€100–900
Time0.5–3 h

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

Parts involved

hydraulic pressure sensorwiring harnesstcm

Related codes

P0932P0933P0935P0936

References: law.cornell.edu, gearsmagazine.com, static.nhtsa.gov.