P182E on GMC
Internal Mode Switch Invalid Range
P182E on GMC vehicles indicates internal mode switch invalid range. Au7o has documented this code across 1 GMC model — most commonly on Terrain. 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. Typical repair costs on GMC range from $150 to $1,500, depending on the specific model and root cause.
Common Causes of P182E
- •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
P182E on GMC by Model
GMC Terrain(1 issue)
- Electronic Shifter Fault - Vehicle Stuck in Park / "Shift to Park" Message2018-2022
Second-generation Terrains with the electronic precision (push-button/monostable) shifter throw a persistent "Shift to Park" warning and refuse to shift out of (or fully into) park even when correctly positioned. GM traced it to build-up/contamination on the Park switch contacts in the transmission control (shifter) assembly, causing high resistance so the BCM cannot electronically confirm the Park position. It can strand the vehicle and, in many cases, keeps the ignition from turning off (stuck in Accessory).
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View P182E across all makes →Frequently Asked Questions
What does P182E mean on GMC?▼
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. On GMC specifically, this code is documented across 1 model.
What causes P182E on GMC vehicles?▼
Common causes on GMC: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P182E on a GMC?▼
Repair costs on GMC range from $150 to $1,500, depending on the specific model and root cause.
Which GMC models have P182E documented?▼
Au7o has documented P182E on 1 GMC model: Terrain.