P182E on 2018-2022 GMC Terrain (SL, SLE, SLT, Denali) — Internal Mode Switch Invalid Range
1 vehicles · 1 makes · $150-$1,500 repair
Most Reported On
P182E is an OBD-II diagnostic trouble code meaning “Internal Mode Switch Invalid Range.” A GM-specific transmission code (Chevrolet, GMC, Buick, Cadillac). The internal mode switch sits inside the transmission and is moved by the shift cable to tell the transmission control module which gear range the driver selected. P182E sets when the switch does not indicate a valid Park, Reverse, Neutral, or Drive position. The transmission usually falls back to a default or limp strategy, so expect harsh or limited shifting, no gear engagement, a no-crank condition, or a gear indicator that shows the wrong range. This code is most commonly reported on 2018-2022 GMC Terrain (SL, SLE, SLT, Denali), with repair costs ranging from $150 to $1,500.
Common Causes
Typical Repair Cost
Based on 1 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
P182E does not use the standard P/B/C/U prefix. It may be a manufacturer-specific code, so verify that a scanner supports your exact year, model and module before buying.
FAQ
What does P182E mean?
P182E stands for "Internal Mode Switch Invalid Range." A GM-specific transmission code (Chevrolet, GMC, Buick, Cadillac). The internal mode switch sits inside the transmission and is moved by the shift cable to tell the transmission control module which gear range the driver selected. P182E sets when the switch does not indicate a valid Park, Reverse, Neutral, or Drive position. The transmission usually falls back to a default or limp strategy, so expect harsh or limited shifting, no gear engagement, a no-crank condition, or a gear indicator that shows the wrong range.
What are the most common causes of P182E?
The most common causes of P182E are: Failed internal mode switch (manual shift position switch) inside the transmission, Misadjusted, stretched, or disconnected shift cable so the switch never reaches a valid detent, Damaged or corroded internal transmission wiring harness or pass-through connector, Low or contaminated transmission fluid, Poor ground or chafed wiring between the switch and the transmission control module, Faulty transmission control module. The specific cause varies by vehicle.
How much does it cost to fix P182E?
Repair costs for P182E range from $150 to $1,500, depending on the vehicle and root cause.
Which vehicles are affected by P182E?
Au7o has documented P182E across 1 vehicle models from 1 manufacturers: GMC.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.