Quick Answer
U0336 means: DTC U0336 indicates a communication error between the vehicle's control modules.
Can I drive with U0336? The issue should be addressed promptly to avoid further complications.
Common Questions
What does U0336 mean and how does it affect my car?
DTC U0336 indicates a problem with communication between various control modules in your vehicle, potentially impacting functions such as lighting and electronic features. Ignoring it can lead to further complications and safety issues.
What are the most common causes of U0336 and how much does it cost to fix?
Common causes include a faulty BCM, damaged wiring, or software issues. Repair costs can range from $50 for a software update to over $1,200 for a BCM replacement.
Can I drive my car with U0336 or should I stop immediately?
While you may be able to drive your vehicle, it is not advisable to ignore the U0336 code, as it could affect critical systems. It's best to have it diagnosed and repaired as soon as possible.
How can I diagnose U0336 myself using GeekOBD APP?
You can use the GeekOBD App to scan for codes, check freeze frame data, and monitor live data to pinpoint the issue. Look for any irregularities in the communication between modules.
What vehicles are most commonly affected by U0336?
Models like the 2016-2020 Ford Explorer, 2017-2021 Chevrolet Malibu, and certain Jeep models from 2014-2019 are known to frequently experience U0336.
How can I prevent U0336 from happening again?
Regular maintenance checks, keeping your vehicle's software updated, and ensuring that wiring and connectors are in good condition can help prevent U0336 from recurring.
What is U0336?
DTC U0336 is a diagnostic trouble code that indicates a communication issue between the vehicle's control modules, particularly related to the Body Control Module (BCM). This code typically arises when there is a loss of communication with the vehicle's data bus, which is responsible for relaying information between various electronic components. In practical terms, if your car throws a U0336 code, it may affect functions such as your vehicle's lighting, climate control, or even start/stop systems. Owners of models like the 2016-2020 Ford Explorer may notice that their dashboard lights flicker or that certain electronic features become unresponsive. The implications can range from minor inconveniences, like interior lights malfunctioning, to significant safety issues if critical components are affected. If left unaddressed, U0336 can lead to more serious electrical issues, potentially resulting in higher repair costs down the line. Understanding this code is crucial for maintaining your vehicle's reliability and safety.
System: U - Network (Communication, CAN Bus)
Symptoms
Common symptoms when U0336 is present:
- The check engine light may illuminate, indicating a fault in the vehicle's electronic systems.
- Drivers might experience intermittent failures of electronic components, like power windows or locks not responding.
- There could be unusual behavior in the dashboard, with warning lights flickering or gauges malfunctioning.
- In some cases, the vehicle may face starting issues, with the engine cranking but not starting due to communication loss.
- You may notice decreased fuel efficiency as the vehicle's systems struggle to operate cohesively.
Possible Causes
Most common causes of U0336 (ordered by frequency):
- The most common cause of DTC U0336 is a faulty Body Control Module (BCM), which could be responsible in about 45% of cases. If the BCM is malfunctioning, it may not communicate effectively with other modules.
- Another frequent cause is damaged wiring or corroded connectors in the vehicle's data bus system, which can disrupt communication between components.
- A third possibility involves software issues, such as outdated firmware in the control modules. Keeping the software updated can prevent these problems.
- Less commonly, a failing Instrument Cluster can create communication issues and is often overlooked during diagnostics.
- Finally, physical damage from accidents or environmental factors can lead to broken wiring or disconnected components, causing the U0336 code to appear.
U0336 Repair Costs
Cost Breakdown by Repair Type
BCM Replacement
Replacing the Body Control Module, which is often the root cause of U0336.
- Total: $600 - $1,200
- Success rate: 85%
Wiring Repair
Repairing damaged wiring or connectors that are affecting communication.
- Total: $150 - $400
- Success rate: 75%
Software Update
Updating the firmware of the vehicle's control modules to eliminate software-related issues.
- Total: $50 - $150
- Success rate: 90%
Money-Saving Tips for U0336
- Start with the most common and least expensive repairs first
- Use GeekOBD APP to confirm diagnosis before replacing expensive parts
- Consider preventive maintenance to avoid future occurrences
- Compare prices for OEM vs aftermarket parts based on your needs
- Address the issue promptly to prevent more expensive secondary damage
Diagnostic Steps
Professional U0336 Diagnosis Process
Follow these systematic steps to accurately diagnose U0336. Each step builds on the previous one to ensure accurate diagnosis.
Step 1: Step 1: Initial visual inspection - Start by checking the vehicle's wiring harness for any obvious signs of damage, loose connections, or corrosion (5-10 minutes)
Step 1: Initial visual inspection - Start by checking the vehicle's wiring harness for any obvious signs of damage, loose connections, or corrosion (5-10 minutes).
Step 2: Step 2: OBD2 scan with GeekOBD App - Use the GeekOBD App to retrieve all active codes and freeze frame data to understand the context of the fault (10-15 minutes)
Step 2: OBD2 scan with GeekOBD App - Use the GeekOBD App to retrieve all active codes and freeze frame data to understand the context of the fault (10-15 minutes).
Step 3: Step 3: Component testing - Utilize a multimeter or specific diagnostic tools to test suspected components, like the BCM (20-30 minutes)
Step 3: Component testing - Utilize a multimeter or specific diagnostic tools to test suspected components, like the BCM (20-30 minutes).
Step 4: Step 4: System function test - After making repairs, verify the proper operation of affected systems and clear the codes to see if they return (10-15 minutes)
Step 4: System function test - After making repairs, verify the proper operation of affected systems and clear the codes to see if they return (10-15 minutes).
Step 5: Step 5: Road test verification - Drive the vehicle under various conditions to confirm that repairs have resolved the U0336 issue (15-20 minutes)
Step 5: Road test verification - Drive the vehicle under various conditions to confirm that repairs have resolved the U0336 issue (15-20 minutes).
Important Notes
- Always verify the repair with GeekOBD APP after completing diagnostic steps
- Clear codes and test drive to ensure the problem is resolved
- Address underlying causes to prevent code recurrence
Real Repair Case Studies
Case Study 1: BCM Replacement on 2017 Ford Explorer
Vehicle: 2017 Ford Explorer, 50,000 miles
Problem: Customer reported flickering dashboard lights and unresponsive electronic locks.
Diagnosis: Diagnostic testing revealed a U0336 code indicating a BCM communication error.
Solution: Replaced the faulty BCM and reprogrammed it to the vehicle's specifications.
Cost: $950 (includes parts and labor)
Result: Customer reported full functionality restored without further issues.
Case Study 2: Wiring Repair on 2018 Chevrolet Malibu
Vehicle: 2018 Chevrolet Malibu, 30,000 miles
Problem: Customer experienced intermittent start failures and dashboard malfunctions.
Diagnosis: Visual inspection revealed damaged wiring near the BCM.
Solution: Repaired the damaged wiring and resecured all connections.
Cost: $200 (minor repair work)
Result: Vehicle operated normally post-repair with no recurrence of U0336.