poor idling random

[Rusty2009]

Not sure but this might help.

Field Remedy: 2495
Subject: Engine A17/20/DTC/H/J/L/R - Increased idle speed
Models: Engines: Option:
Insignia 2009...,Astra-J 2010... A20DTC| A20DTH| A20DTJ| A20DTL| A20DTR,A17DTJ| A17DTR| A20DTC| A20DTH| A20DTJ| A20DTR
Complaint: Customer might complain about an increased idle speed up to 1150 rpm.
Cause: Increased idle speed signal is managed by the engine ECU but based on a signal coming from the BCM (Body Control Module). In case the state of charge (SOC) for the battery is too low the BCM urges the engine ECU to increase idle speed in order reload the battery in a proper way. There are three possible idle speed steps going from : -- step 1 (= 925 rpm) to -- step 2 (= 1000 rpm-1050 rpm) and -- step 3 (= 1100 rpm-1150 rpm) depending on the SOC as well as the outside temperature which also affects the SOC. Other possible reasons for increased idle speed also managed by the engine ECU based on a BCM request: a.) During auxiliary heater on the idle speed will be set to step 2. b.) During HVAC operation the idle speed will be set to step1-3 based on the thermal load. c.) During DPF regeneration mode the idle speed will be set to step1-3 based on the engine requirements.
Production:


Remedy:
In case of customer complaint please explain the technical content to
your customer.
FunctionalGroup: J - Engine
Complaint Group: 19 - Poor Engine Driveability
Trouble Code: None