Powertrain, generic (extended)

P262E Sensor Reference Voltage G Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

With P262E the 5 V supply G that the engine module feeds to a sensor group sits above its upper limit. That points to an external voltage source getting onto the line, for example a reference wire rubbed through against a 12 V feed or a sensor signal wire, or to a regulator inside the module that no longer holds its setpoint. Sensors powered from G scale their outputs with this supply, so their readings rise and can become implausible; a hard short to battery voltage may also damage them. No manufacturer documents P262E publicly. Ford's 2012 summary treats more than 5.25 V on its reference A for 5 s as a short toward battery voltage, and GM's tables use 5.125 V as the ceiling for its collective reference codes. P262D is the low fault, P262F the plausibility fault on circuit G.

Likely causes

Reference wire G shorted to a 12 V feed or another powered circuit
Sensor on the group feeding voltage back into the reference
Internal regulator of the engine module out of tolerance

Symptoms

  • Check engine light
  • Readings of several sensors too high or implausible
  • Limp mode or reduced power possible

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

P262CP262DP262FP06D8P0643

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