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.
Medium severity. Can I keep driving?If the car is running normally, drive in moderation to a repair shop. If it loses power or another warning appears, do not continue.
Symptoms
- Warning light on
- Harsh shifts due to default maximum pressure
- Possible limp mode
Most 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
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: medium
- It can trigger limp mode.
- It affects emissions.
What each character of P0934 means
- P: Powertrain: engine and transmission
- 0: Generic code: same on every make
- 9: Transmission
- 34: Specific fault in that system
Frequently asked questions
Can I keep driving with code P0934?
If the car is running normally, drive in moderation to a repair shop. If it loses power or another warning appears, do not continue.
What causes code P0934?
The most common causes are: sensor signal wire shorted to ground; 5 V reference open or shorted; pressure sensor or the solenoid pack carrying it failed.
Related codes
- P0932Hydraulic Pressure Sensor Circuit
- P0933Hydraulic Pressure Sensor Range/Performance
- P0935Hydraulic Pressure Sensor Circuit High
- P0936Hydraulic Pressure Sensor Circuit Intermittent
Sources
- law.cornell.edu: 13 CCR 1968.2
- gearsmagazine.com: diagnosing pressure trouble codes
- static.nhtsa.gov: MC 10168599 0001
Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.