P0894 on GMC
Transmission Component Slipping
P0894 on GMC vehicles indicates transmission component slipping. Au7o has documented this code across 1 GMC model — most commonly on Yukon XL. This generic transmission code means the PCM/TCM detected that a rotating component inside the transmission is slipping, by comparing input and output speeds and finding more difference than there should be for the commanded gear. Slippage indicates clutches or bands are not holding properly, which can quickly worsen and damage the transmission through overheating and accelerated wear. It often comes with rough or flaring shifts, reduced power, and overheating, and should be addressed promptly. Typical repair costs on GMC range from $150 to $3,000, depending on the specific model and root cause.
Common Causes of P0894
- •Low, dirty, or burnt transmission fluid
- •Worn clutch packs or bands
- •Faulty shift or pressure control solenoid
- •Internal hydraulic/valve body problems
- •Worn torque converter
- •Faulty speed sensors giving false slip readings
- •General internal transmission wear
P0894 on GMC by Model
GMC Yukon XL(2 issues)
- 6L80/6L90 Transmission Cooler Line Leak at Crimp/Fitting (Fluid Loss)2007-2016
GMT900 and early K2XX Yukon XL models with 6L80/6L90 transmissions commonly develop leaks at the transmission cooler line crimps or quick-connect fittings. Owners report red fluid spots, low transmission fluid, and in severe cases slipping or overheating if fluid loss is significant. This issue is widely documented in owner reports and GM service bulletins addressing cooler line seepage/connection concerns on full-size trucks/SUVs using these transmissions.
- Transmission Torque Converter Shudder (8L90/10L80)2015-2024
The 8-speed (8L90) and 10-speed (10L80) automatic transmissions in the Yukon XL develop a torque converter clutch (TCC) shudder felt as a vibration or shake at light throttle between 25-50 mph. The shudder mimics driving over rumble strips. GM issued multiple TSBs (18-NA-355, 19-NA-193) and eventually reformulated the transmission fluid specification. The root cause is the TCC friction material interaction with the original Dexron HP fluid formulation.
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View P0894 across all makes →Frequently Asked Questions
What does P0894 mean on GMC?▼
P0894 stands for "Transmission Component Slipping." This generic transmission code means the PCM/TCM detected that a rotating component inside the transmission is slipping, by comparing input and output speeds and finding more difference than there should be for the commanded gear. Slippage indicates clutches or bands are not holding properly, which can quickly worsen and damage the transmission through overheating and accelerated wear. It often comes with rough or flaring shifts, reduced power, and overheating, and should be addressed promptly. On GMC specifically, this code is documented across 1 model.
What causes P0894 on GMC vehicles?▼
Common causes on GMC: Low, dirty, or burnt transmission fluid, Worn clutch packs or bands, Faulty shift or pressure control solenoid, Internal hydraulic/valve body problems, Worn torque converter. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0894 on a GMC?▼
Repair costs on GMC range from $150 to $3,000, depending on the specific model and root cause.
Which GMC models have P0894 documented?▼
Au7o has documented P0894 on 1 GMC model: Yukon XL.