DTC C0550 00: EEPROM Checksum Mismatch . Your best bet , take your vehicle to a qualified repair shop.
Circuit/System Description
When the ignition is turned ON, the microprocessor runs a diagnostic program to detect an internal fault when power up is commanded. If an internal malfunction is detected, the control module will store a DTC C0550 in its memory.
Action Taken When the DTC Sets
If equipped, the following module specific actions may occur:
• The antilock brake system (ABS) indicator turns ON.
• The BRAKE warning indicator turns ON.
• The electronic brake control module (EBCM) disables the ABS/dynamic rear proportion (DRP)/traction control system (TCS).
• The driver information center (DIC) displays the power steering warning message No Steering Assist.
• The TCS indicator turns ON.
SOURCE: Chevy HHR 2008 LT 2.4. Message ESC OFF, SERVICE
Hello and welcome. the engine reduce power waraning is the key to the other problems. this is normally a problem with the electronic throttle system. the engine control module disables the traction control system when it detects a engine problem, in your case a problem with the electronic throttle system. you shouldnt drive with this concern. this is normally covered under the vehicles 100,000 mile warranty. you need to conteact your nearest dealer for help
SOURCE: the abs light is on
the abs light is on because it is telling you that the abs system has a fault in one of the sensors, also with the light on it means that the abs is disabled. the traction control and esc are on because they are linked to the abs
SOURCE: THE "SERVICE TRACTION SYSTEM" LIGHT
that one of your sensors needs to be replaced,do a diagnostic test it should pinpoint which one is causing the code to come on
SOURCE: Traction control on chevy hhr 2006
The traction control and transmission shifting would involve the body computer more so than the engine computer.
Have you had the body computer scanned for trouble codes ?
SOURCE: chevy hhr esc comes on service traction engine light comes on
Did you check for codes & google them,
to see what system has a possible fault
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