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.

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HOMESERVICE MANUALSCHEVROLET2008HHR LS, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS AND FUEL - 2.2L (L61) - DTC P0442 TO DTC P2544DTC P0451, P0452, P0453, OR P0454DIAGNOSTIC FAULT INFORMATION

2008 Chevrolet HHR LS, Automatic

Diagnostic Fault Information

2008 Chevrolet HHR LS, AutomaticSECTION Diagnostic Fault Information

Circuit	Short to Ground	High Resistance	Open	Short to Voltage	Signal Performance
FTP Sensor Low Reference	-	P0446, P0451	P0446	-	P0451
FTP Sensor Signal	P0452	-	P0452	P0453	P0451, P0454
FTP Sensor 5-Volt Reference	P0452, P0530, P0641	P0451	P0446, P0452	P0453, P0530, P0641	-

RENDER: 1.0x

NO RELATED

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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.