U2106Network Communication

CAN Communication Bus - TCM Reset Detected

U2106 is a manufacturer-specific code indicating that a module detected the transmission control module (TCM) reset or dropped off the CAN bus and returned. It usually points to power, ground, or communication issues.

🚗 Depends. Repeated TCM resets can cause shifting problems, so diagnose it.

MEDIUM

severity

🎯 Top Causes, Ranked by Likelihood

#1Poor power or ground to the TCM$50-$300

35%

Intermittent power or ground causes the TCM to reset.

#2Bus wiring or connector fault$50-$400

30%

Wiring problems interrupt TCM communication and trigger a reset code.

#3Failing TCM$300-$1200

20%

An internal TCM fault can cause resets.

#4Low system voltage$100-$400

15%

Weak battery or charging problems cause module resets.

🩺 Common Symptoms

Transmission or check engine light
Intermittent harsh or erratic shifting
Multiple communication codes
Possible limp mode

💰 Repair Cost: DIY vs Shop

DIY Cost

$50-$400

Shop Cost

$150-$1200

📋 Free OBD2 Code Cheat Sheet

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

🔧 How to Diagnose U2106

1Check battery and charging system voltage

2Verify power and grounds at the TCM

3Inspect TCM wiring and connectors

4Scan for other communication codes stored with it

❓ Frequently Asked Questions

Can I drive with U2106?

It depends. Repeated TCM resets can cause shifting problems and limp mode, so diagnose it.

What does a TCM reset mean?

A module saw the TCM drop off the bus and return, usually from power, ground, or wiring issues.

What causes U2106?

Poor power or ground to the TCM, wiring faults, low voltage, or a failing TCM.

🔗 Related Codes

U2105U0101U0402U1000