OBD-II Diagnostic Trouble Code
U0144 — Lost Communication With Body Control Module D
U0144 sets when a module stops receiving expected network messages from Body Control Module D. BCM D is one of several body controllers on vehicles with distributed body control, and its exact job depends on the manufacturer. The receiving module logged a message timeout, so the root cause can be anywhere in the power, ground or network path to BCM D.
Severity 3/5
Truck-relevant
Service this week
Severity
Service this week
Lost Communication With Body Control Module D
Code
U0144
Category
Network
Subsystem
Network
Truck-relevant
Yes
What this means for truckers
Service within a few days on a Cummins X15, Detroit DD15, PACCAR MX-13. Performance is likely degraded. Continuing to drive without service risks additional component damage.
Before you replace parts — try this first
U0144 on the Network system is most often blown fuse, poor power feed or loose ground at bcm d — not a dead part. On commercial diesels especially, work these in order before spending money on parts:
- Confirm the symptoms. Match what your truck is doing to the Symptoms section below. If the code is set but the symptoms are not there, clear the code and re-test after a drive cycle — it may not return.
- Clean and dry the sensor connector. Water, road salt, or oil seeping into a connector is the #1 fake sensor failure. Disconnect, look for green corrosion or moisture, spray with electrical contact cleaner, dry, reseat. Many faults clear here for $0.
- Inspect the wiring harness. Trace the wire from the sensor toward the ECM — look for chafing against the engine block, melted insulation near the turbo or exhaust, or pinch points where a clamp has rubbed through.
- Test the sensor before swapping it. Most Common Causes (below) list the expected voltage or resistance range — a $20 multimeter saves a $300 sensor swap that does not fix the problem.
- Only then, replace the part. Use the OEM or a tier-1 aftermarket. Cheap sensors throw the same code in two weeks.
Symptoms
Expect a warning light or message plus loss of whatever body loads BCM D controls, often lighting, locks or accessory circuits. Driveability is normally not affected unless the shared network problem also affects powertrain modules.
Common causes
- CommonBlown fuse, poor power feed or loose ground at BCM D ($50–$250)
- CommonChafed, open or shorted CAN wiring or corroded connector ($150–$600)
- OccasionalLow battery voltage or a charging system problem ($100–$900)
- RareFailed Body Control Module D ($500–$1800)
How to fix
Test battery and charging voltage and check all power and ground circuits to BCM D
When to use: First step on any lost-communication code
Measure CAN bus voltage and termination resistance and inspect connectors at BCM D
When to use: When power and ground are good
Repair harness damage found during a wiggle test
When to use: For intermittent codes that set while driving
Replace and program BCM D
When to use: Only after the circuits have been verified
Affects most
No specific vehicle pattern found in our complaint database. This code can appear on any vehicle that supports OBD-II diagnostics.
Related
- → Browse all DTC trouble codes
- → Decode a VIN to check codes for your truck
- → Owner-operator maintenance guides
- → U0100 — Lost Communication With ECM/PCM A
- → U0101 — Lost Communication With TCM
- → U0102 — Lost Communication With Transfer Case Control Module
- → U0103 — Lost Communication With Gear Shift Module
- → U0104 — Lost Communication With Cruise Control Module
Frequently Asked Questions
Can I drive with code U0144?
U0144 is severity 3 — plan service within a few days. Performance is likely degraded already (you may feel reduced power, harsher shifts, or slightly worse fuel economy). Continuing to drive risks additional damage to adjacent components.
How much does it cost to fix U0144 on a commercial truck?
Total repair cost ranges $50–$1800 depending on the root cause. The cheapest fix is usually the first one listed below — Blown fuse, poor power feed or loose ground at BCM D — which is also the most common. On commercial trucks the cost is usually higher than passenger vehicles due to part availability and shop labor rates ($120–185/hour at most truck shops, vs $90–130 at general auto shops). DIY-capable fixes (sensors, hoses, filters) are at the low end; major component replacements (turbo actuator, high-pressure fuel pump, transmission solenoid pack) are at the high end. Always diagnose with a scan tool BEFORE replacing parts — guessing wrong on a $1,500 turbo actuator when the actual issue was a $30 boost hose is a common expensive mistake.
Will U0144 fail a DOT inspection?
U0144 is generally not a direct DOT inspection fail item by itself. Inspectors focus on safety-critical systems (brakes, steering, tires, lights, hours-of-service). However, the check engine light alone can trigger additional inspection scrutiny. Best practice: fix the code and clear it before a planned inspection.
What's the difference between U0144 and related codes?
U0144 is closely related to: U0100 (Lost Communication With ECM/PCM A), U0101 (Lost Communication With TCM), U0102 (Lost Communication With Transfer Case Control Module), U0103 (Lost Communication With Gear Shift Module). These codes share the same subsystem (network) and often appear together. If you see this code, scan for the full code list — fixing the root cause usually clears multiple companion codes at once. If only U0144 is set without the companions, the issue is more isolated.
How do I prevent U0144 from coming back after a repair?
For U0144 (Lost Communication With Body Control Module D), prevention centers on the network system. Pay attention to ground connections at every PM — bad grounds are 70% of communication codes. Inspect harness routing for chafe points. Don't disconnect modules with the key on.