U0140 on Dodge
Lost Communication with BCM
U0140 on Dodge vehicles indicates lost communication with bcm. Au7o has documented this code across 2 Dodge models — most commonly on Challenger, Magnum. U0140 is a network communication code meaning a module has lost communication with the body control module (BCM) over the vehicle's data bus. The BCM oversees many body and convenience functions — lighting, door locks, windows, wipers, anti-theft, and gateway communications — so losing contact with it can cause a wide range of seemingly unrelated electrical problems and warning lights. This is typically a wiring, connector, power/ground, or bus fault, or a failure of the BCM itself. Because the BCM often acts as a communication hub, this code can appear alongside other 'lost communication' codes. Typical repair costs on Dodge range from $10 to $2,400, depending on the specific model and root cause.
Common Causes of U0140
- •Loss of power or ground to the BCM
- •CAN/data bus wiring damage, short, or open circuit
- •Corroded, loose, or damaged BCM connectors
- •Blown fuse feeding the BCM
- •Failed body control module
- •Water intrusion or corrosion in the harness
- •Another module faulting the shared data bus
U0140 on Dodge by Model
Dodge Challenger(1 issue)
- Power-Steering Noise (Groan/Whine/Honk) at Low Speed & EHPS Assist Loss Tied to the Alternator Recall2008-2014
The Dodge Challenger has two distinct, well-documented power-steering complaints on the pre-2015 LC/LX-platform cars, and both are flagged by RepairPal as common problems (MotorBiscuit lists "a loud power steering system" among the four most-reported Challenger issues). FIRST, a HYDRAULIC NOISE: owners hear a honk, hiss, groan, or whine from the steering during low-speed parking-lot maneuvers, worst when turning the wheel toward full lock. RepairPal documents this as a recognized concern on 2008-2012 Challengers; Chrysler addressed it with TSB 19-005-10 ("Steering Gear Honk, Hiss or Groan During Low Speed Parking Lot Maneuvers," superseding 19-003-09), which traces the noise to the power-steering return hose and, in some cases, the steering gear (rack). Fluid aeration, a low or contaminated fluid level, and worn pump vanes/bearings produce the same groan/whine. SECOND, an ASSIST-LOSS failure on EHPS cars: 2011-2014 Challengers with the 3.6L Pentastar or 5.7L HEMI use an electro-hydraulic power-steering (EHPS) pump that depends on the charging system. Under NHTSA recall 17V-435 (Chrysler recall T36, ~442,214 vehicles across Challenger/Charger/300/Durango/Grand Cherokee), the alternator can suffer diode thermal fatigue specifically because of the cyclical electrical loads the EHPS pump imposes; when the diodes fail, system voltage drops, the EHPS pump shuts down, the steering goes heavy, and the vehicle can stall without warning (failed diodes can also short and cause heat/smoke/fire). Note the engine/fluid split: 3.6L/5.7L EHPS cars require Mopar Electric Power Steering Fluid, while the conventional hydraulic SRT8/392 (6.1L/6.4L) and base V6 systems use ATF+4 — using the wrong fluid causes noise, seal damage, and pump failure. This entry is distinct from the later electronic-EPS-rack failure on the 2015+ refreshed Challenger (recalls S19/16V-167 and VB8/19V-812), which is a different rack design and root cause.
Dodge Magnum(1 issue)
- Electrical System Flickering, Dash Light Failures, and Steering Column Module Issues2005-2008
The Dodge Magnum suffers from widespread electrical problems centered around the TIPM (Totally Integrated Power Module) and the steering column control module (clockspring). Symptoms include dash lights flickering or going completely dark while driving, headlights cutting out at night, loss of turn signals, wipers, horn, and cruise control all at once. The steering column module failure is particularly dangerous as it can disable multiple safety systems simultaneously. The TIPM relay failures can cause no-start conditions, fuel pump cutouts, and random electrical gremlins throughout the vehicle.
Looking for U0140 on a different make?
View U0140 across all makes →Frequently Asked Questions
What does U0140 mean on Dodge?▼
U0140 stands for "Lost Communication with BCM." U0140 is a network communication code meaning a module has lost communication with the body control module (BCM) over the vehicle's data bus. The BCM oversees many body and convenience functions — lighting, door locks, windows, wipers, anti-theft, and gateway communications — so losing contact with it can cause a wide range of seemingly unrelated electrical problems and warning lights. This is typically a wiring, connector, power/ground, or bus fault, or a failure of the BCM itself. Because the BCM often acts as a communication hub, this code can appear alongside other 'lost communication' codes. On Dodge specifically, this code is documented across 2 models.
What causes U0140 on Dodge vehicles?▼
Common causes on Dodge: Loss of power or ground to the BCM, CAN/data bus wiring damage, short, or open circuit, Corroded, loose, or damaged BCM connectors, Blown fuse feeding the BCM, Failed body control module. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix U0140 on a Dodge?▼
Repair costs on Dodge range from $10 to $2,400, depending on the specific model and root cause.
Which Dodge models have U0140 documented?▼
Au7o has documented U0140 on 2 Dodge models: Challenger, Magnum.