Powertrain, generic (extended)

P262C Sensor Reference Voltage G Circuit/Open

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modePossible

Engine modules supply groups of sensors from separately regulated 5 V outputs, lettered A, B, C and so on; G is the seventh such supply. P262C is the general fault of this output, typically an interruption so that the sensors behind it lose their feed and report signals near zero together. No manufacturer documents P262C publicly, and which sensors hang on circuit G depends entirely on the application. Comparable checks exist for earlier letters: GM monitors its fifth reference with a single collective code (P06D2) and a window of 4.875-5.125 V, type A; Ford checks reference A for shorts to earth or to the battery, with a 5 s debounce. CARB treats such outputs as monitored comprehensive components. Low, high and plausibility faults of circuit G are P262D, P262E and P262F.

Likely causes

Broken reference wire or splice feeding the sensors of circuit G

Loose or corroded pin at the engine module or a sensor plug

Internal regulator of the engine module for output G failed

Symptoms

Check engine light
Several sensor codes appearing at the same time
Reduced power or limp mode depending on the affected sensors

Repair estimate

DifficultyMediumWorkshop job

Parts and labour€50–800

Time1–4 h

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

Parts involved

sensor reference voltage circuitsensor wiringengine control module

Related codes

P262D P262E P262F P06D6 P06D2 P0641

References: law.cornell.edu, gsi.ext.gm.com, newtonnet.co.uk.