04zombiehunter
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Can anyone please tell me what code po651 means or where to start looking to fix it. I know it's a ecm code
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- Thread starter 04zombiehunter
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mogleybear
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This is what I have found doing a quick search.
Generic OBD Error Code Details for P0651
Sensor Reference Voltage "B" Circuit/Open
What does this mean?
OBD Code P0651refers to
These 5-volt reference circuits are independent of each other outside the PCM, but are bussed together inside the Engine Control Module (ECM). Therefore a circuit condition on one sensor 5-volt reference circuit may affect the other sensor 5-volt reference circuits. The ECM monitors the voltage on the 5-volt reference circuit.
Causes
Possible causes of OBD code P0651
- Shorted sensor - Shorted sensor circuit - Failed ECM The Error code is generally activated on detection of the following conditions: The ECM has detected an out of voltage range on the 5 volt reference circuit 2
The 5-volt reference 2 bus provides 5 volts to the following sensors:
- The APP (accelerator pedal position) sensor 1
- The throttle position (TP) sensor 1 and 2
- The crankshaft position (CKP) sensor
• It may be possible to locate the fault by disconnecting one component at a time from the affected 5-volt reference circuit while viewing the 5-Volt Reference circuit status parameter on the scan tool. The scan tool parameter will change from Fault to OK when the source of the fault is disconnected. If all 5-volt reference components have been disconnected and a fault is still indicated, the fault may exist in the wiring harness.
Generic OBD Error Code Details for P0651
Sensor Reference Voltage "B" Circuit/Open
What does this mean?
OBD Code P0651refers to
These 5-volt reference circuits are independent of each other outside the PCM, but are bussed together inside the Engine Control Module (ECM). Therefore a circuit condition on one sensor 5-volt reference circuit may affect the other sensor 5-volt reference circuits. The ECM monitors the voltage on the 5-volt reference circuit.
Causes
Possible causes of OBD code P0651
- Shorted sensor - Shorted sensor circuit - Failed ECM The Error code is generally activated on detection of the following conditions: The ECM has detected an out of voltage range on the 5 volt reference circuit 2
The 5-volt reference 2 bus provides 5 volts to the following sensors:
- The APP (accelerator pedal position) sensor 1
- The throttle position (TP) sensor 1 and 2
- The crankshaft position (CKP) sensor
• It may be possible to locate the fault by disconnecting one component at a time from the affected 5-volt reference circuit while viewing the 5-Volt Reference circuit status parameter on the scan tool. The scan tool parameter will change from Fault to OK when the source of the fault is disconnected. If all 5-volt reference components have been disconnected and a fault is still indicated, the fault may exist in the wiring harness.