01 Mass Air Flow Sensor (MAF): How It Works, Symptoms and Prob… • 02 Why Your Car Shakes at Idle but Smooths Out While Driving • 03 How to Identify and Fix a Catalytic Converter Problem • 04 The 9 Silent Signs of a Failing Oxygen Sensor • 05 The Business of Car Importation: Profits and Risks Explained • 06 The Heart of Automatic Transmissions: A Closer Look at Torq… • 07 What Happens If You Ignore Wheel Bearing Noise? • 08 What Does It Mean When Your Car Won't Go Over 3,000 RPM? • 09 Diagnosing and Troubleshooting Different Types Of Exhaust S… • 10 New Engines Use Tiny Explosions Of Air Instead Of Spark Plu… •

DTC codes / U03xx · Software and configuration mismatches / U031E

U031ESoftware Incompatibility With Parking Assist Control Module B

U031E means the parking assist control module B reported a software version or configuration that is incompatible with another module on the vehicle's controller area network (CAN) bus. The computer detected a mismatch in software identification or calibration data during a handshake between modules, so the parking assist feature may be disabled.

SystemNetwork
Code typeGeneric (all makes)
SeverityLow
Fix difficultyProfessional
AreaSoftware and configuration mismatches

Symptoms you may notice

  • Parking assist warning light illuminated on the dashboard
  • Parking sensors or automatic parking feature not functioning
  • Often no symptoms besides the warning light
  • Intermittent parking assist operation or false alerts
  • Related driver assistance systems may be disabled

Common causes, most likely first

  1. Software or firmware mismatch between parking assist module B and another module
  2. Aftermarket or incorrect module installed without proper programming
  3. Failed software update or incomplete reprogramming procedure
  4. Corrupted configuration data in the parking assist module
  5. CAN bus communication errors causing incomplete software handshake
  6. Faulty parking assist control module B

How to diagnose and fix it

  1. Scan all modules for stored codes and record freeze-frame data
  2. Verify battery voltage and check for loose or corroded connections at the parking assist module
  3. Check for technical service bulletins (TSBs) or software updates from the manufacturer
  4. Reprogram or update the parking assist module B with the latest software
  5. Perform a configuration or adaptation reset using a factory-level scan tool
  6. Inspect CAN bus wiring for shorts, opens, or interference
  7. Replace and program the parking assist control module B if software cannot be corrected

Before you replace the parking assist module

  • A weak battery or poor ground can cause modules to drop off the bus during programming, leading to a false U031E.
  • Aftermarket parking sensors or modules often lack correct software identification and trigger this code even when they function.
  • The code may be stored in a module other than the parking assist module, so always check all modules for related codes.
  • A simple battery disconnect and reconnect can sometimes clear a temporary software handshake error, but proper reprogramming is usually required.
  • U031E can be set by a mismatch in as-built data after a module replacement, even if the hardware is correct.

Can I keep driving with U031E?

The vehicle remains safe to drive because parking assist is a convenience feature, but avoid relying on parking sensors or automatic parking until the fault is repaired. Have the system diagnosed soon to prevent further module communication issues.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

Running on fumes Free guides aren't free to make. Top up the tank. Any amount, one time. Fuel the Garage