U0101 on Dodge
Lost Communication with TCM
U0101 on Dodge vehicles indicates lost communication with tcm. Au7o has documented this code across 2 Dodge models — most commonly on Challenger, Dart. This is a network communication code meaning a control module on the vehicle's data bus has lost communication with the Transmission Control Module (TCM). Modern vehicles use a shared data network (commonly CAN bus) so modules can exchange information; when the TCM stops responding or its messages disappear, other modules set this code. Because the transmission relies on this communication to shift properly, the vehicle may go into 'limp' mode, hold one gear, or refuse to shift normally. It generally indicates a wiring, power, ground, or connector problem on the network — or a failed TCM itself — rather than an internal mechanical transmission fault. Typical repair costs on Dodge range from $600 to $1,200, depending on the specific model and root cause.
Common Causes of U0101
- •Damaged, corroded, or loose TCM wiring or connectors
- •Open or short in the CAN bus data wiring
- •Blown fuse or lost power/ground to the TCM
- •Corrosion or water intrusion at the TCM connector
- •Faulty Transmission Control Module
- •Another faulty module dragging down the data bus
- •Poor ground connection in the network
U0101 on Dodge by Model
Dodge Challenger(1 issue)
- TIPM (Totally Integrated Power Module) Failure — Random No-Start, Fuel-Pump No-Prime, Stalling & Battery Drain2008-2014
The Totally Integrated Power Module (TIPM-7 generation) is the Challenger's central fuse-and-relay box and power-distribution computer, mounted in the engine bay. It manages nearly every electrical circuit, and a single failed solder joint, blown internal circuit-board trace, or — most commonly — a degraded internally-soldered fuel-pump relay can cripple the whole car. Because the fuel-pump (ASD) relay is hard-soldered into the TIPM circuit board (not a serviceable plug-in relay), owners cannot simply swap a relay. The dominant root cause is contamination/degradation of the sealed relay contacts (silicone vapor that hardens into insulation and burns under load) compounded by water/moisture intrusion and corrosion of the board, which is why failures are intermittent and often produce no stored trouble codes. The result is a cluster of seemingly unrelated, hard-to-diagnose faults: a relay stuck OFF causes random no-start, no fuel-pump prime, and mid-drive stalling; a relay stuck ON causes the fuel pump to run continuously and drain the battery overnight. This is the root cause behind the model's worst CarComplaints electrical category — the 2013 Challenger alone has a dedicated "bad TIPM" complaint cluster, with failures averaging around 43,000 miles (reported range roughly 8,000–76,000 miles), well within the life of the car. Critically for Challenger owners, the fuel-pump-relay recall campaigns (NHTSA 15V-115 / Safety Recall R09 and the 2019 redo 19V-813) covered the Durango and Jeep Grand Cherokee — NOT the Challenger. NHTSA's recall list for the Challenger shows only airbag and alternator campaigns, no TIPM recall, so Challenger owners pay out of pocket (commonly ~$700–$1,100). The 2008–2014 (LC-body) cars share the TIPM-7 implicated across the Chrysler/Dodge/Jeep lineup; 2010–2014 see the heaviest complaint volume.
Dodge Dart(1 issue)
- Transmission Control Module (TCM) Failure on 2.4L Automatic2013-2016
The 2.4L Dart paired with the Aisin 6-speed automatic experiences TCM failures that cause erratic shifting, failure to shift, and limp mode. The TCM mounted on the transmission is exposed to heat and vibration, leading to internal circuit board failures. Unlike the DDCT issues on 1.4T models, this affects the conventional automatic transmission.
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View U0101 across all makes →Frequently Asked Questions
What does U0101 mean on Dodge?▼
U0101 stands for "Lost Communication with TCM." This is a network communication code meaning a control module on the vehicle's data bus has lost communication with the Transmission Control Module (TCM). Modern vehicles use a shared data network (commonly CAN bus) so modules can exchange information; when the TCM stops responding or its messages disappear, other modules set this code. Because the transmission relies on this communication to shift properly, the vehicle may go into 'limp' mode, hold one gear, or refuse to shift normally. It generally indicates a wiring, power, ground, or connector problem on the network — or a failed TCM itself — rather than an internal mechanical transmission fault. On Dodge specifically, this code is documented across 2 models.
What causes U0101 on Dodge vehicles?▼
Common causes on Dodge: Damaged, corroded, or loose TCM wiring or connectors, Open or short in the CAN bus data wiring, Blown fuse or lost power/ground to the TCM, Corrosion or water intrusion at the TCM connector, Faulty Transmission Control Module. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix U0101 on a Dodge?▼
Repair costs on Dodge range from $600 to $1,200, depending on the specific model and root cause.
Which Dodge models have U0101 documented?▼
Au7o has documented U0101 on 2 Dodge models: Challenger, Dart.