U010B — Lost Communication With Exhaust Gas Recirculation Control Module "B"

U010B — Lost Communication With Exhaust Gas Recirculation Control Module "B". A fault in the exhaust gas recirculation (EGR) system. The car is usually drivable while you plan the repair. Typical causes: faulty EGR solenoid or wiring, failed EGR valve or position sensor, vacuum leaks in EGR control lines.

vehicle network

Is it safe to drive?

Short-term driving is OK Generally safe to drive in the short term. Expect rough idle, pinging and higher emissions; on some cars the engine may derate. If the engine stalls or runs very rough, treat it as urgent.

How to diagnose with an OBD scanner

Read the code and freeze frame Connect an OBD2 scanner, confirm U010B 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 exhaust gas recirculation (EGR) system for damage, corrosion, chafing or poor contact.
Subsystem check Command the EGR valve open/closed with a scanner and watch idle quality and position feedback.
Subsystem check Remove and inspect the EGR valve and passages for carbon blockage before replacing parts.
Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm U010B does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for U010B (parts and labor, USD, independent shop rates): Clean the EGR valve and passages: $120–$350; Replace the EGR valve: $250–$650; Repair vacuum lines or wiring: $80–$250. Overall, fixing U010B usually costs between $80 and $650. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Common questions

Will U010B clear itself?

Sometimes U010B clears after a few drive cycles if the fault was intermittent — for example a loose connector or a tank of bad fuel. The underlying cause usually remains, so the code tends to return. Clear it once; if it comes back, diagnose rather than erase it repeatedly.

What does OBD2 code U010B mean?

How do I diagnose U010B myself?

Start with a scan: confirm U010B, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the exhaust gas recirculation (EGR) system, and verify the suspect component against live data before buying parts.

What is the most common cause of U010B?

The most common causes are: faulty EGR solenoid or wiring, failed EGR valve or position sensor, vacuum leaks in EGR control lines.

What are the symptoms of U010B?

Drivers most often notice: Check Engine Light on, hesitation and pinging under load, slight power loss, rough idle or stalling at idle.

What does U010B mean?

The engine control module sets U010B when it detects a fault in the exhaust gas recirculation (EGR) system. In practical terms: lost communication with exhaust gas recirculation control module "B". The code belongs to the vehicle network group of OBD2 codes.

This code does not appear from a single bad reading: the module must see the fault condition repeat under defined operating conditions before it turns on the warning light. The freeze frame captured with U010B — engine load, rpm, temperature, speed — tells you exactly when the problem occurs, so reproduce those conditions when testing.

What causes U010B?

vacuum leaks in EGR control lines
carbon buildup blocking the EGR valve or passages
ECM control circuit fault
failed EGR valve or position sensor
faulty EGR solenoid or wiring

Common symptoms of U010B

Check Engine Light on
hesitation and pinging under load
slight power loss
rough idle or stalling at idle
increased NOx emissions

How to diagnose U010B

Connect an OBD2 scanner, confirm U010B 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 exhaust gas recirculation (EGR) system for damage, corrosion, chafing or poor contact.
Command the EGR valve open/closed with a scanner and watch idle quality and position feedback.
Remove and inspect the EGR valve and passages for carbon blockage before replacing parts.
Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm U010B does not return.

How to fix U010B

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

Clean the EGR valve and passages — $120–$350
Replace the EGR valve — $250–$650
Repair vacuum lines or wiring — $80–$250

How much does it cost to fix U010B?

Repair cost depends on which component actually failed. Typical scenarios for U010B (parts and labor, USD, independent shop rates):

Clean the EGR valve and passages: $120–$350
Replace the EGR valve: $250–$650
Repair vacuum lines or wiring: $80–$250

Overall, fixing U010B usually costs between $80 and $650. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Can you drive with U010B?

Generally safe to drive in the short term. Expect rough idle, pinging and higher emissions; on some cars the engine may derate. If the engine stalls or runs very rough, treat it as urgent.