MechanicDB
Fault Family System: Powertrain (P-Codes) 52 SAE Codes

Sensor Reference Voltage Circuit

Diagnostic & Technical Explanation
Code P0641 (Sensor Reference Voltage A Circuit/Open) sets when the ECM detects an open, shorted, or out-of-range condition on one of its shared 5V/8V/12V reference or power-supply rails that feed multiple sensors and low-current actuators. Because several sensors share the same rail, the dominant cause is one shorted or internally failed sensor pulling the entire rail out of range, though chafed harness wiring or a failed ECM internal regulator are also possible.

These 52 diagnostic trouble codes share one detection mechanism and one repair path, which is why MechanicDB groups them into a single authored fault family rather than repeating the same explanation 52 times.

Codes in this family (52)

CodeDefinitionRepair coverage
P0641Sensor Reference Voltage A Circuit/Open3 ranked fixes
P0642Sensor Reference Voltage A Circuit Low3 ranked fixes
P0643Sensor Reference Voltage A Circuit High3 ranked fixes
P0651Sensor Reference Voltage B Circuit/Open3 ranked fixes
P0652Sensor Reference Voltage B Circuit Low3 ranked fixes
P0653Sensor Reference Voltage B Circuit High3 ranked fixes
P0657Actuator Supply Voltage A Circuit/Open3 ranked fixes
P0658Actuator Supply Voltage A Circuit Low3 ranked fixes
P0659Actuator Supply Voltage A Circuit High3 ranked fixes
P0697Sensor Reference Voltage C Circuit/Open3 ranked fixes
P0698Sensor Reference Voltage C Circuit Low3 ranked fixes
P0699Sensor Reference Voltage C Circuit High3 ranked fixes
P06A3Sensor Reference Voltage D Circuit/Open3 ranked fixes
P06A4Sensor Reference Voltage D Circuit Low3 ranked fixes
P06A5Sensor Reference Voltage D Circuit High3 ranked fixes
P06A6Sensor Reference Voltage A Circuit Range/Performance3 ranked fixes
P06A7Sensor Reference Voltage B Circuit Range/Performance3 ranked fixes
P06A8Sensor Reference Voltage C Circuit Range/Performance3 ranked fixes
P06A9Sensor Reference Voltage D Circuit Range/Performance3 ranked fixes
P06B0Sensor Power Supply A Circuit/Open3 ranked fixes
P06B1Sensor Power Supply A Circuit Low3 ranked fixes
P06B2Sensor Power Supply A Circuit High3 ranked fixes
P06B3Sensor Power Supply B Circuit/Open3 ranked fixes
P06B4Sensor Power Supply B Circuit Low3 ranked fixes
P06B5Sensor Power Supply B Circuit High3 ranked fixes
P06D2Sensor Reference Voltage E Circuit/Open3 ranked fixes
P06D3Sensor Reference Voltage E Circuit Low3 ranked fixes
P06D4Sensor Reference Voltage E Circuit High3 ranked fixes
P06D5Sensor Reference Voltage E Circuit Range/Performance3 ranked fixes
P06D6Sensor Reference Voltage F Circuit/Open3 ranked fixes
P06D7Sensor Reference Voltage F Circuit Low3 ranked fixes
P06D8Sensor Reference Voltage F Circuit High3 ranked fixes
P06D9Sensor Reference Voltage F Circuit Range/Performance3 ranked fixes
P06E6Sensor Power Supply C Circuit/Open3 ranked fixes
P06E7Sensor Power Supply C Circuit Low3 ranked fixes
P06E8Sensor Power Supply C Circuit High3 ranked fixes
P262CSensor Reference Voltage G Circuit/Open3 ranked fixes
P262DSensor Reference Voltage G Circuit Low3 ranked fixes
P262ESensor Reference Voltage G Circuit High3 ranked fixes
P262FSensor Reference Voltage G Circuit Range/Perfomance3 ranked fixes
P2669Actuator Supply Voltage B Circuit /Open3 ranked fixes
P2670Actuator Supply Voltage B Circuit Low3 ranked fixes
P2671Actuator Supply Voltage B Circuit High3 ranked fixes
P2684Actuator Supply Voltage C Circuit/Open3 ranked fixes
P2685Actuator Supply Voltage C Circuit Low3 ranked fixes
P2686Actuator Supply Voltage C Circuit High3 ranked fixes
P26DFSensor Power Supply D Circuit/Open3 ranked fixes
P26E0Sensor Power Supply D Circuit Low3 ranked fixes
P26E1Sensor Power Supply D Circuit High3 ranked fixes
P26E7Actuator Supply Voltage D Circuit/Open3 ranked fixes
P26E8Actuator Supply Voltage D Circuit Low3 ranked fixes
P26E9Actuator Supply Voltage D Circuit High3 ranked fixes

What this page does not show

This page publishes the fault mechanism and the code index. The licensed dataset adds, for every one of the 15,886 codes, the full authored repair set (56,729 procedures in total) with the fields deliberately withheld here: