U0231Network Communication

Lost Communication With Rear Object Sensing Module

U0231 means a module lost communication with the rear object sensing module, which supports rear parking sensors, cross-traffic alert, and similar features.

🚗 Usually yes, but rear sensing and warnings may be disabled. Use extra care when backing up.

MEDIUM

severity

🎯 Top Causes, Ranked by Likelihood

#1Wiring or connector fault to the module$50-$300

35%

Open or shorted wiring interrupts communication with the sensing module.

#2Failed rear object sensing module$200-$700

30%

An internal failure stops the module from communicating.

#3Poor power or ground to the module$50-$250

20%

Missing power or ground keeps the module offline.

#4Bus fault affecting the module$100-$500

15%

A network problem can drop the module off the bus.

🩺 Common Symptoms

Rear sensors not working
Cross-traffic alert disabled
Parking warning message
No rear obstacle alerts

💰 Repair Cost: DIY vs Shop

DIY Cost

$50-$300

Shop Cost

$150-$700

📋 Free OBD2 Code Cheat Sheet

The 50 most common codes with likely cause and DIY fix cost. Sent once, no spam.

🔧 How to Diagnose U0231

1Scan modules and confirm which are communicating

2Verify power and ground at the rear sensing module

3Inspect wiring and connectors to the module

4Test the bus signal reaching the module

❓ Frequently Asked Questions

Can I drive with U0231?

Usually yes, but rear sensing may be disabled. Take extra care when reversing.

What does the rear object sensing module do?

It supports rear parking sensors and rear cross-traffic alert to warn of obstacles behind you.

What causes U0231?

Wiring or connector faults, a failed sensing module, or a power and ground problem.

🔗 Related Codes

U0159U0155U0140U0233