What causes my Hyundai Elantra to get stuck in one gear o r go into “limp mode”?

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What causes my Hyundai Elantra to get stuck in one gear o r go into “limp mode”?

When the transmission goes into limp mode stuck in a single gear, often second o r third, it’s a protective response triggered by the TCM o r ECU to prevent further damage. This is commonly caused by sensor failures like the input/output speed sensors, solenoid issues, o r internal transmission faults. A diagnostic scan will usually reveal transmission-related error codes e.g., P0700, P0715, P0720. Prompt diagnosis is critical to avoid major repairs.

Gari Specialist asked on 21 Jun 2025 18:23:07 pm

1 Answer

17 views |

Gari Master - on 21 Jun 2025 18:27:37 pm

If your Elantra is stuck in a single gear and won’t shift, the car has likely gone into limp mode, which is designed to protect the transmission from further damage.
Common causes:

Faulty transmission input o r output speed sensors

Failed shift solenoids

Damaged wiring o r connector issues

Software issues in the Transmission Control Module TCM
The vehicle may also trigger the check engine light, with error codes like P0700, P0715, o r P0720.
Fix:
Scan the car with an OBD-II diagnostic tool to read the specific code. In many cases, a simple sensor replacement o r TCM update resolves the issue. If the vehicle won’t shift out of a single gear, avoid driving long distances and have it towed for service.