Powertrain, generic · Transmission
P0894 Transmission Component Slipping
Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible
P0894 reports slip of a gearbox component, found by comparing speeds. GM's 4L60-E applies it to the torque converter clutch: with lock-up commanded, slip between 100 and 550 rpm for 12.75 s on the third attempt in 4th gear sets it, type B with MIL after two trips; the module first freezes adaptation and raises line pressure. Lexus (Aisin AB60F) and Allison 1000 use it for a slipping shift element or low pressure and name the fluid level first. On the 4L60-E a cracked converter clutch PWM solenoid is a known cause.
Likely causes
Low, wrong or worn fluid
Converter clutch PWM solenoid cracked or regulator bore worn (GM 4L60-E)
Worn clutch plates or converter clutch lining
Pump not priming, cracked suction filter (Allison)
Control module software
Symptoms
- Engine speed rises without matching acceleration, mostly when warm
- Shudder during lock-up
- Harsh shifts from maximum pressure, limp mode possible
Repair estimate
DifficultyHardWorkshop job
Parts and labour€100–4,000
Time0–12 h
Typical range across vehicles; the real cost depends on what the testing finds.
Parts involved
torque converter clutchtransmission clutchestransmission fluidtransmission pumptcc pressure solenoid
Related codes
References: gsi.ext.gm.com, gsi.ext.gm.com, static.nhtsa.gov, static.nhtsa.gov.