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Reggie Whiddon
Reggie Whiddon,
Category: Chevy
Satisfied Customers: 108
Experience:  Lead tech at river regions auto
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Eng pwr reduced and now it is giving me a P0651 fault code

Customer Question

eng pwr reduced and now it is giving me a P0651 fault code which is new.. i just replaced throttle body, TB connector, Cam Shaft Sensor and Connector because the codes were on TB and CSS..
JA: Let's get those codes to the mechanic so you two can figure this issue out ASAP. How many miles are on the car?
Customer: 197500
JA: What is the model of your '195500 Chevy?
Customer: 2008 Chevy Cobalt
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: just replaced throttle body, harness, cam shaft sensor and harness
JA: Anything else you think the mechanic should know?
Customer: no
Submitted: 3 months ago.
Category: Chevy
Expert:  Reggie Whiddon replied 3 months ago.

1. Disconnect one component at a time from the 5V2 circuit while watching the 5V2 circuit Parameter Identification (PID) on the scan tool. This should change from Fault to OK, if the fault is gone. Inspect wires and connectors on the circuit carefully.

2. The components are the Crankshaft Position (CKP) sensor, Accelerator Pedal Position (APP) Sensor, Throttle Position Sensor (TPS), and the Air Injection (AIR) Solenoid (if equipped).

3. Monitor the 5V2 reference circuit for 5 V with a Digital Volt Ohm Meter (DVOM) if the scan tool does not show the PI

Expert:  Reggie Whiddon replied 3 months ago.

The problem is most likely your AIR solenoid its right there on top of the engine disconnect it and see if problem goes away

Expert:  Reggie Whiddon replied 3 months ago.

Hello wanted to know if you were still working on this and needed more help