P0841

Transmission Fluid Pressure Sensor/Switch A Circuit Range/Performance

Q: Is it safe to drive with P0841?

Short trips are usually possible, but slipping or harsh shifts can damage the transmission over time, so get it looked at promptly.

Q: Can I just clear P0841?

It will clear, but it returns once the pressure signal is out of range again until the sensor, wiring, or fluid issue is fixed.

Transmission / hydraulic control Generic OBD-II Medium

What it means

P0841 means the transmission control module sees a fluid-pressure reading from sensor/switch A that doesn't match what it expects for current conditions. Correct hydraulic pressure controls how gears engage, so a bad reading can cause harsh shifts, slipping, or a limp mode. The engine still starts and runs — this is a transmission pressure-signal fault.

Medium

Can I keep driving? Often drivable, but expect harsh or delayed shifts and possible slipping — repair soon to avoid transmission wear.

Real-world scan data

Seen in

148

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
Harsh or delayed shifting
Transmission slipping or failing to engage a gear
Transmission may enter limp mode

Common causes

Most likely first

Faulty transmission fluid pressure sensor/switch ALikely
Damaged wiring or connectors in the sensor circuitCommon
Low or degraded transmission fluid affecting real pressureCommon
Failed transmission control module (rare)Less often

How to diagnose & fix

Work through it in order

Check transmission fluid level and condition first — low or burnt fluid can drive the pressure reading out of range.
Read freeze-frame data and inspect the pressure sensor connector and wiring for damage or corrosion.
Compare the sensor's reported pressure against a mechanical gauge if available to confirm the sensor is at fault.
Replace the transmission fluid pressure sensor/switch A if it reads out of range with wiring and fluid confirmed good. Clear and re-test.

FAQ

Quick answers

Is it safe to drive with P0841?+

Short trips are usually possible, but slipping or harsh shifts can damage the transmission over time, so get it looked at promptly.

Can I just clear P0841?+

It will clear, but it returns once the pressure signal is out of range again until the sensor, wiring, or fluid issue is fixed.

Read & clear P0841 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