P0934

Hydraulic Pressure Sensor Circuit Low

Q: Is it safe to drive with P0934?

Short trips are usually okay, but rough or slipping shifts stress the transmission. Have it diagnosed before long drives.

Q: Can I just clear P0934?

It returns until the sensor or wiring is repaired. A low reading is often a wiring short or a failed sensor rather than a real pressure loss.

Transmission hydraulics Generic OBD-II Medium

What it means

P0934 means the transmission's hydraulic pressure sensor is sending a signal that's too low — often a short to ground, an open, or a failed sensor rather than an actual pressure problem. The engine starts and runs normally, but because the controller can't trust the pressure reading, shift quality can suffer and the transmission may enter a protective mode. Check the wiring and fluid level, then the sensor itself.

Medium

Can I keep driving? Usually drivable, but shifts may feel rough or lazy — get it checked soon to protect the transmission.

Real-world scan data

Seen in

scans in the past year

Found in

<0.1%

of scans

<0.1%

of scans that found faults

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Check-engine light on
Rough, harsh, or delayed shifting
Transmission may enter a fail-safe (limp) mode
Slightly reduced fuel efficiency

Common causes

Most likely first

Faulty hydraulic pressure sensorLikely
Short to ground or open in the sensor signal circuitCommon
Loose or corroded connector at the sensorCommon
Low or dirty transmission fluid affecting real pressureLess often
Failed transmission control module (rare)Less often

How to diagnose & fix

Work through it in order

Read freeze-frame data and confirm the sensor is reading low (near zero).
Check transmission fluid level and condition.
Inspect the hydraulic pressure sensor connector and wiring for a short to ground or open.
Measure the sensor's reference and signal voltages against spec.
Replace the pressure sensor if it reads low, repair wiring as needed, then clear and road-test.

FAQ

Quick answers

Is it safe to drive with P0934?+

Short trips are usually okay, but rough or slipping shifts stress the transmission. Have it diagnosed before long drives.

Can I just clear P0934?+

It returns until the sensor or wiring is repaired. A low reading is often a wiring short or a failed sensor rather than a real pressure loss.

Read & clear P0934 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX