This code indicates that the voltage on a specific power input circuit ('C') to a control module is outside the expected range. It typically means there is an issue with the power supply feeding a module, such as voltage dropping too low, spiking too high, or fluctuating unpredictably.
Corroded, loose, or damaged wiring and connectors in the power input circuit can cause high resistance or intermittent connections, altering the voltage range.
A degraded relay with high internal resistance or a fuse with micro-fractures can restrict current flow and cause a voltage drop at the module.
A failing battery, weak alternator, or poor ground strap can cause system voltage to fall out of the normal operating range, triggering this module code.
Internal electrical failures within the receiving control module can cause it to draw abnormal current or misinterpret the incoming power supply voltage.
No, it usually does not. The code is almost always caused by external power supply issues like corroded wiring, bad grounds, or failing relays. Replacing the module without fixing the root cause will not resolve the problem and the code will return.
It is risky. Because this code affects the power supply to a critical control module, the module may shut down unexpectedly, leading to stalling or a no-start condition.
Control modules monitor their input voltages. If resistance in a connector or wire reduces the voltage reaching the module below or above its calibrated threshold, the module detects that the 'C' circuit is out of its performance range and sets the code.