Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2009 Chevrolet Impala SSFACTORY OEM SERVICE PROCEDURE
Diagnostic Trouble Code Index
DIAGNOSTIC TROUBLE CODE INDEX
| DTC | Description |
|---|---|
| DTC B1000 | B1000 00: Electronic Control Unit (ECU) Performance No Additional Information Available B1000 04: Side Object Detection Performance - RAM Failure B1000 08: Electronic Control Unit (ECU) Performance Signal Invalid B1000 12: Electronic Control Unit (ECU) Performance Below Minimum Threshold B1000 31: Electronic Control Unit (ECU) General Checksum Problem B1000 33: Electronic Control Unit (ECU) Performance Special Memory Failure B1000 34: Electronic Control Unit (ECU) Performance RAM Integrity B1000 35: Electronic Control Unit (ECU) Performance ROM Integrity B1000 36: Electronic Control Unit (ECU) Performance EEPROM Integrity B1000 37: Electronic Control Unit (ECU) Performance Watchdog / Safety Failure B1000 38: Electronic Control Unit (ECU) Performance Supervision Software Failure B1000 39: Electronic Control Unit (ECU) Performance Internal Electronic Failure B1000 43: Electronic Control Unit (ECU) Performance EEPROM Error B1000 46: Side Object Detection Performance - Invalid Configuration B1000 56: Electronic Control Unit (ECU) Performance Allowable Number of Transitions/ Events Exceeded B1000 57: Electronic Control Unit (ECU) Performance B1000 73: Electronic Control Unit (ECU) Performance Parity Error B1000 0F: Electronic Control Unit (ECU) Performance Erratic B1000 2B: Electronic Control Unit (ECU) Performance Missing Reference B1000 2C: Electronic Control Unit Performance Reserved B1000 3B: Electronic Control Unit (ECU) Performance Internal Self Test Failed B1000 3C: Electronic Control Unit (ECU) Performance Internal Communications Failure B1000 4A: Side Object Detection Performance - PROM Checksum Error B1000 F0: Side Object Detection RF Transmit Chain Failed B1000 F1: Side Object Detection RF Receive Chain Failed B1000 F2: Side Object Detection Frequency Calibration Failure B1000 F3: Side Object Detection Inter-Processor Communication Failed |
| DTC B1001 | B1001 00: Option Configuration Error B1001 45: Option Configuration Error Variant Not Programmed B1001 46: Option Configuration Error B1001 4B: Option Configuration Error Calibration Not Learned |
| DTC B1016 | B1016 00: VIN Not Programmed |
| DTC C0550 | C0550 00: Electronic Control Unit (ECU) Performance C0550 31: Electronic Control Unit (ECU) Performance C0550 32: ECU Performance General Memory Failure C0550 34: ECU Malfunction RAM Failure C0550 35: ECU Malfunction ROM Failure C0550 36: ECU Malfunction EEPROM Failure C0550 37: ECU Malfunction Watch Dog failure C0550 38: ECU Performance Supervision Software Failure C0550 39: ECU Performance Internal Electronic Failure/Discard C0550 4B: ECU Internal Fault |
| DTC U0020 | U0020 00: Low Speed CAN Communication Bus Performance |
| DTC U0073 or U2100 | U0073 00: Control Module Communication Bus Off U0073 71: ECU HS Bus Off U0073 72: ECU LS Bus Off U2100 00: Controller Area Network (CAN) Bus Communication U2100 47: Controller Area Network (CAN) Bus Communication |
| DTC U0100-U0299 | Serial Data Circuit/Control Module Is Not Communicating |
| DTC U1814 | U1814 00: Powertrain High Speed Communication Enable Circuit |
| DTC U1826 or U1827 | U1826 71: Lost Communication With Multi-Axis Acceleration Sensor Module on Bus "B" Invalid Serial Data Received U1826 72: Lost Communication With Multi-Axis Acceleration Sensor Module on Bus "B" Alive Counter Incorrect/Not Updated U1826 7F: Lost Communication With Multi-Axis Acceleration Sensor Module on Bus "B" Erratic U1827 71: Lost Communication With Steering Angle Sensor Module on Bus "B" Invalid Serial Data U1827 72: Lost Communication With Steering Angle Sensor Module on Bus "B" Alive Counter Incorrect/Not Updated U1827 74: Lost Communication With Steering Angle Sensor Module on Bus "B" Value of Signal Protection Calculation Incorrect U1827 7F: Lost Communication With Steering Angle Sensor Module on Bus "B" Erratic |
| DTC U2099 | U2099 00: High Speed Communication Enable Circuit |
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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