P0E35 DC/DC Converter Voltage Sensor A Intermittent/Erratic

P0E35 is reserved for a voltage sensor A signal that jumps or drops out briefly instead of staying wrong: the reading is erratic, but not low or high long enough for P0E33 or P0E34 to mature. No manufacturer documents P0E35 publicly. The neighbouring GM codes for the same sensor (25OBDG03A, a converter backing up the 12 V network during engine auto-starts) show the frame: valid readings lie between 1 V and 28 V and are sampled every 12.5 ms. CARB expects input faults to be split into circuit, out-of-range and, where feasible, rationality checks; an erratic code captures the unstable signal in between. Loose terminals, a cracked solder joint or a ground that only fails under vibration are the usual suspects, so the fault may come and go.

Likely causes

Symptoms

• Warning light that appears and disappears
• Start-stop works only now and then

Repair estimate

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

Related codes

References: law.cornell.edu, gsi.ext.gm.com.