U010E — Lost Communication With Reductant Control Module

OBD2 code U010E flags a problem with the vehicle network (CAN bus) communication (lost communication with reductant control module). Short, gentle driving to a shop is usually possible. Common culprits: poor grounds or low battery voltage, corroded connectors, especially in wet areas, aftermarket equipment interfering with the bus.

vehicle network

Is it safe to drive?

Drive with caution Depends on what is affected. A single dead convenience module is fine to drive with; loss of communication with engine, braking or steering modules is not. If multiple critical systems drop out, do not drive.

How to diagnose with an OBD scanner

Read the code and freeze frame Connect an OBD2 scanner, confirm U010E is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
Check for companion codes and TSBs Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many U0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
Inspect wiring and connectors Visually inspect the wiring harness and connectors related to the vehicle network (CAN bus) communication for damage, corrosion, chafing or poor contact.
Subsystem check Measure resistance between CAN-High and CAN-Low at the OBD port with power off — about 60 Ω is healthy.
Subsystem check Scan all modules: the one that does not respond is either the culprit or downstream of the break.
Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm U010E does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for U010E (parts and labor, USD, independent shop rates): Replace the faulty control module: $300–$1,500; Remove interfering aftermarket device: $0–$150; Repair CAN wiring or connectors: $100–$400. Overall, fixing U010E usually costs between $0 and $1,500. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Common questions

What does OBD2 code U010E mean?

Is it safe to drive with U010E?

Depends on what is affected. A single dead convenience module is fine to drive with; loss of communication with engine, braking or steering modules is not. If multiple critical systems drop out, do not drive.

How do I diagnose U010E myself?

Start with a scan: confirm U010E, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the vehicle network (CAN bus) communication, and verify the suspect component against live data before buying parts.

What is the most common cause of U010E?

The most common causes are: poor grounds or low battery voltage, corroded connectors, especially in wet areas, aftermarket equipment interfering with the bus.

What are the symptoms of U010E?

Drivers most often notice: random, hard-to-reproduce electrical glitches, modules intermittently not communicating with the scanner, multiple warning lights on at once, intermittent loss of functions (gauges, windows, steering assist).

What does U010E mean?

U010E is logged by the onboard diagnostics when the vehicle network (CAN bus) communication does not behave as expected. The official definition is “Lost Communication With Reductant Control Module”. This is a vehicle network category code.

The module monitors this system continuously while driving. When readings fall outside the expected range for a defined number of drive cycles, it stores U010E and switches on the warning light. Freeze frame data saved with the code shows the exact conditions — rpm, load, temperature, speed — at the moment the fault was detected, which is the best starting point for diagnosis.

What causes U010E?

water ingress in harness junctions
a faulty module pulling the bus down
poor grounds or low battery voltage
damaged CAN bus wiring or short to power/ground
aftermarket equipment interfering with the bus

Common symptoms of U010E

random, hard-to-reproduce electrical glitches
modules intermittently not communicating with the scanner
multiple warning lights on at once
intermittent loss of functions (gauges, windows, steering assist)
no-start or intermittent starting in some cases

How to diagnose U010E

Connect an OBD2 scanner, confirm U010E is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many U0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
Visually inspect the wiring harness and connectors related to the vehicle network (CAN bus) communication for damage, corrosion, chafing or poor contact.
Measure resistance between CAN-High and CAN-Low at the OBD port with power off — about 60 Ω is healthy.
Scan all modules: the one that does not respond is either the culprit or downstream of the break.
Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm U010E does not return.

How to fix U010E

Start with the cheapest and most common causes before replacing expensive parts:

Replace the faulty control module — $300–$1,500
Remove interfering aftermarket device — $0–$150
Repair CAN wiring or connectors — $100–$400

How much does it cost to fix U010E?

Repair cost depends on which component actually failed. Typical scenarios for U010E (parts and labor, USD, independent shop rates):

Replace the faulty control module: $300–$1,500
Remove interfering aftermarket device: $0–$150
Repair CAN wiring or connectors: $100–$400

Overall, fixing U010E usually costs between $0 and $1,500. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.