U1016Network Communication

Loss Of Communication With PCM/ECM

U1016 is a manufacturer-specific code indicating loss of communication with the powertrain or engine control module (PCM/ECM) over the data bus. Systems relying on engine data lose it.

🚗 Not recommended. Loss of engine module communication can cause no-start or major drivability problems.

HIGH

severity

🎯 Top Causes, Ranked by Likelihood

#1Wiring or connector fault to the PCM$50-$400

35%

Open or shorted wiring interrupts communication with the PCM.

#2Failed PCM/ECM$300-$1200

30%

An internal module failure stops it from communicating.

#3Poor power or ground to the PCM$50-$300

20%

Missing power or ground keeps the PCM offline.

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

15%

A network problem can drop the PCM off the bus.

🩺 Common Symptoms

No-start or stalling
Check engine light or no communication
Multiple modules affected
Gauges and features not working

💰 Repair Cost: DIY vs Shop

DIY Cost

$50-$400

Shop Cost

$200-$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 U1016

1Scan modules and confirm the PCM is not communicating

2Verify power and grounds at the PCM

3Inspect wiring and connectors to the PCM

4Test the bus signal reaching the PCM

❓ Frequently Asked Questions

Can I drive with U1016?

It is not recommended. Loss of engine module communication can cause no-start or serious drivability issues.

What module is affected?

The powertrain or engine control module (PCM/ECM), which controls the engine and shares data with other systems.

What causes U1016?

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

🔗 Related Codes

U0100U0001U0073U0140