Worn or burnt clutch B friction plates from normal wear or overheating; Low or degraded transmission fluid causing insufficient hydraulic pressure to apply clutch B; Faulty clutch B solenoid or solenoid circuit wiring, preventing proper clutch apply; Sticking or leaking clutch B apply piston or seals inside the transmission; Valve body wear or contamination causing pressure loss to the clutch B circuit; Transmission control module software calibration issue or faulty speed sensor signals; Mechanical damage to the clutch B drum or return spring

DTC codes / P08xx · Transmission / P081E

P081EExcessive Clutch B Slippage

Q: What does code P081E mean?

Excessive Clutch B Slippage. P081E indicates that the transmission control module has detected excessive slippage in clutch B, which is a clutch pack inside an automatic or dual-clutch transmission. The computer compares expected clutch slip against actual input and output shaft speeds and sets this code when the measured slip exceeds the programmed limit for a calibrated amount of time.

P081E indicates that the transmission control module has detected excessive slippage in clutch B, which is a clutch pack inside an automatic or dual-clutch transmission. The computer compares expected clutch slip against actual input and output shaft speeds and sets this code when the measured slip exceeds the programmed limit for a calibrated amount of time.

SystemPowertrain

Code typeGeneric (all makes)

SeverityHigh

Fix difficultyProfessional

AreaTransmission

Symptoms you may notice

Illuminated check engine light or transmission warning light, often with no other noticeable symptoms
Harsh or delayed gear engagements, especially when shifting into a gear that uses clutch B
Slipping sensation during acceleration, where engine speed rises without a matching increase in vehicle speed
Transmission may enter limp mode, limiting the vehicle to a single gear or reduced power
Shuddering or vibration during shifts that involve clutch B
Overheated transmission fluid or a burning smell after sustained driving

Common causes, most likely first

Worn or burnt clutch B friction plates from normal wear or overheating
Low or degraded transmission fluid causing insufficient hydraulic pressure to apply clutch B
Faulty clutch B solenoid or solenoid circuit wiring, preventing proper clutch apply
Sticking or leaking clutch B apply piston or seals inside the transmission
Valve body wear or contamination causing pressure loss to the clutch B circuit
Transmission control module software calibration issue or faulty speed sensor signals
Mechanical damage to the clutch B drum or return spring

How to diagnose and fix it

Check transmission fluid level and condition; top off or replace fluid if it is low or burnt
Scan all modules for related codes and freeze-frame data to confirm the slip occurred under specific conditions
Inspect clutch B solenoid and its wiring for resistance, shorts, and corrosion; test solenoid operation with a bidirectional scan tool
Perform a transmission pressure test to verify hydraulic pressure at the clutch B circuit
Remove the transmission pan to inspect for debris, burnt fluid, or clutch material in the pan
If fluid and electronics are good, remove and disassemble the transmission to inspect clutch B pack, piston, and seals
Repair or replace worn clutch B components, valve body, or solenoid as needed, then clear codes and verify with a road test

What P081E does not always mean

A P081E code can be set by a simple low-fluid condition or a degraded fluid that has lost its friction modifiers, so always verify fluid level and condition before condemning the clutch pack.
Some vehicles use clutch B for engine braking or coast clutch functions, so the code may appear only during deceleration or specific driving modes rather than during acceleration.
A faulty wheel speed sensor or output shaft speed sensor can cause the transmission control module to miscalculate slip and falsely set P081E, so check speed sensor signals before internal repairs.
After a transmission replacement or valve body service, a new or remanufactured unit may set P081E if the adaptive learning values were not reset or if the wrong fluid was used.
In dual-clutch transmissions, clutch B may be the even-gear clutch, so symptoms might be limited to even-numbered gears and the code can be misdiagnosed as an engine misfire or ignition issue.

Can I keep driving with P081E?

Driving with P081E risks further clutch and transmission damage because continued slippage generates excessive heat and can contaminate the fluid. Limit driving to short distances at low speed and avoid heavy acceleration or towing until the fault is diagnosed and repaired.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.