P100A 2014 GMC Sierra Code - Turbocharger Boost Control Signal Message Counter Incorrect

The P100A code indicates an issue with the turbocharger boost control signal message counter, meaning the communication between the turbo control module and the engine control module (ECM) is not synchronized correctly.

Symptoms may include reduced engine performance, turbocharger not functioning properly, a check engine light, and poor acceleration or power loss.

The most common causes include a malfunctioning turbocharger boost control module, wiring or connector issues, software glitches in the ECM or turbo module, and, less commonly, a faulty ECM.

Start by inspecting the wiring and connectors related to the turbocharger boost control module for damage or corrosion. Then, use a scan tool to check for related codes and monitor live data for abnormalities in boost control signals.

While the code is more commonly related to communication issues, a malfunctioning turbocharger or components like the actuator could indirectly contribute to the problem.

Repairs may include cleaning or replacing corroded connectors, repairing damaged wiring, reprogramming or updating the ECM or turbo control module software, or replacing the turbocharger boost control module if necessary.

Driving with this code is not recommended, as it can lead to reduced engine performance and may cause further damage to the turbocharger or engine components over time.

Yes, in some cases, reprogramming or updating the ECM or turbo control module software can resolve the issue if the problem is related to a software glitch.

Repair costs vary depending on the underlying issue but can range from $100 for simple wiring repairs to $1,000 or more if the turbocharger boost control module needs replacement.

Clearing the code with a scan tool might temporarily turn off the check engine light, but the issue will likely return unless the root cause is addressed.