U1341 on Hyundai
Communication Fault with Engine Module (Manufacturer Specific)
U1341 on Hyundai vehicles indicates communication fault with engine module (manufacturer specific). Au7o has documented this code across 1 Hyundai model — most commonly on Ioniq. U1341 is a manufacturer-specific network code indicating a communication fault with the engine control module (engine/PCM), meaning another module is not receiving the expected messages from the engine controller over the data bus. As a U-code it concerns the communication network rather than an internal engine part, and it typically results from wiring, connector, power, or module problems on the bus. Symptoms can include warning lights, lost features, or drivability issues depending on which data is missing. Because it is manufacturer-specific, the exact bus and pins involved should be confirmed against the vehicle's service information.
Common Causes of U1341
- •Damaged, shorted, or open bus wiring to the engine module
- •Corroded or loose connectors at the engine control module
- •Loss of power or ground to the engine module
- •Internal engine control module failure
- •Faulty gateway or another module disrupting the bus
- •Blown fuse affecting module power
- •Bus terminating resistor or wiring harness fault
U1341 on Hyundai by Model
Hyundai Ioniq(1 issue)
- Hybrid Control Unit Software Glitches and Warning Lights2019-2022
The Hyundai Ioniq Hybrid and Plug-In Hybrid models from 2019-2022 can exhibit warning lights and system faults caused by software bugs in the Hybrid Control Unit (HCU) and Low DC/DC Converter (LDC). The issues include communication errors (DTC U1341) between control modules, incorrect battery state-of-charge calculations, and improper power distribution between the electric motor and gasoline engine. Hyundai has released multiple TSBs addressing software logic updates for the HCU and LDC. The Plug-In Hybrid variant is more frequently affected due to its more complex power management between the larger battery, electric motor, and engine.
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View U1341 across all makes →Frequently Asked Questions
What does U1341 mean on Hyundai?▼
U1341 stands for "Communication Fault with Engine Module (Manufacturer Specific)." U1341 is a manufacturer-specific network code indicating a communication fault with the engine control module (engine/PCM), meaning another module is not receiving the expected messages from the engine controller over the data bus. As a U-code it concerns the communication network rather than an internal engine part, and it typically results from wiring, connector, power, or module problems on the bus. Symptoms can include warning lights, lost features, or drivability issues depending on which data is missing. Because it is manufacturer-specific, the exact bus and pins involved should be confirmed against the vehicle's service information. On Hyundai specifically, this code is documented across 1 model.
What causes U1341 on Hyundai vehicles?▼
Common causes on Hyundai: Damaged, shorted, or open bus wiring to the engine module, Corroded or loose connectors at the engine control module, Loss of power or ground to the engine module, Internal engine control module failure, Faulty gateway or another module disrupting the bus. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix U1341 on a Hyundai?▼
Repair costs vary widely depending on the root cause and specific Hyundai model.
Which Hyundai models have U1341 documented?▼
Au7o has documented U1341 on 1 Hyundai model: Ioniq.