ION L4-2.4L (2007)
Engine Block Heater: Technical Service Bulletins
Engine Coolant Heater - Proper Plug Usage
Bulletin No.: 07-06-02-002
Date: February 23, 2007
INFORMATION
Subject:
Information on Use of Correct Engine Coolant Heater Cord to Avoid Setting DTC P0116
Models:
2006 Chevrolet Cobalt, HHR
2006 Pontiac Pursuit, G5 (Canada Only)
2006 Saturn ION
All with 2.4L Engine (VIN P - RPO LE5)
2007 Chevrolet Cobalt, HHR
2007 Pontiac G5
2007 Saturn ION
All with 2.2L or 2.4L Engine (VINs D, P - RPOs L61, LE5)
The OBDII diagnostics require a thermostatically controlled engine coolant heater cord that disables the coolant heater above a threshold temperature,
approximately -18°C (0°F). Using a non-thermostatically controlled engine coolant heater cord above this threshold temperature may generate a DTC
P0116.
The figure above shows a non-thermostatically controlled plug (top) and a thermostatically controlled plug (bottom). The thermostatically controlled
plug is larger and has a tag attached indicating that it operates below -18°C (0°F).
If any of the above-listed vehicles is found to have DTC P0116 set, the technician should verify that the correct engine coolant heater cord is installed.
The thermostatically and non-thermostatically controlled engine coolant heater cords are interchangeable.
Refer to Coolant Heater Cord Replacement in SI.
