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Home / DTC / P262F — Sensor Reference Voltage G Circuit Range/Perfomance

P262F — Sensor Reference Voltage G Circuit Range/Perfomance

Detailed page for trouble code P262F.

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Code

P262F

Generic P — Powertrain

Sensor Reference Voltage G Circuit Range/Perfomance

Brand: Generic
Type: P — Powertrain
Views: UK: 5 EN: 13 RU: 6
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Page language: EN

Causes

  • Open or high-resistance wiring in the Sensor Reference Voltage G circuit
  • Short to ground or short to battery/ignition voltage on the reference wire
  • Corroded, loose, or damaged connector or terminal at sensor or ECU
  • Blown fuse or failed reference/regulator inside the ECU
  • Damaged or faulty sensor drawing excessive current from the reference circuit
  • Poor battery/charging system voltage or weak ground connection causing unstable reference

Symptoms

  • Illuminated MIL (Check Engine Light) with P262F stored
  • One or more sensors reporting implausible values or erratic behavior
  • Engine misfire, rough idle, poor drivability in some cases
  • Failure to start or hard cranking if reference supply is severely compromised
  • Intermittent faults that may clear when wiring is moved or connector reseated

What to check

  • Read and record freeze frame and pending codes with a scan tool; check for related codes
  • Verify battery resting voltage and charging system output (12.4–13.8 V nominal at key-on/off and running)
  • Inspect fuses and any ECU/engine harness ground points for corrosion or looseness
  • Visually inspect wiring harness along route for abrasion, pinch points, repairs, melted insulation
  • Backprobe the sensor reference terminal with key ON (engine OFF) and during cranking/running to measure voltage
  • Compare reference voltage at the sensor connector to the ECU reference terminal

Signal parameters

  • Expected sensor reference voltage: typically ~5.0 V (some systems use 3.3 V). Check vehicle data for exact spec
  • Acceptable tolerance: approximately 4.75–5.25 V for 5 V systems (or ±0.15–0.2 V for 3.3 V systems) under key ON (engine OFF) with no sensors drawing abnormally
  • During cranking/load the voltage may dip slightly but should remain stable and return to spec when running
  • Short to ground → near 0 V; short to battery → near battery voltage (greater than nominal reference); high noise or irregular waveform indicates wiring or ECU issue

Diagnostic algorithm

  1. Verify code: Connect a scan tool, confirm P262F is current/pending, and note freeze-frame data and any related codes.
  2. Battery & power: Check battery voltage and charging system. Repair any low-voltage issues before proceeding.
  3. Visual inspection: Inspect harness, connectors, pins, and ground points for damage, corrosion, or poor repair splice along Sensor Reference G circuit path.
  4. Check fuses/ECU power: Verify relevant fuses and power supplies to ECU are good.
  5. Measure reference at sensor: Backprobe the sensor reference terminal with key ON (engine OFF). Record voltage and compare to vehicle spec.
  6. Measure at ECU: Backprobe the ECU reference output for the same circuit and compare. If ECU output is correct but sensor end is low/high, suspect wiring/short between.
  7. Isolate loads: Disconnect the sensor(s) that use the reference circuit and re-check the reference voltage. If voltage returns to normal with sensor disconnected, suspect a faulty sensor or short within sensor.
  8. Continuity/short tests: With power off, measure resistance from reference wire to ground and to battery voltage to find shorts. Wiggle harness and re-test for intermittent faults.
  9. Use scope if available: Observe waveform for noise, instability, or collapsing voltage under load/crank.
  10. Repair and verify: Repair wiring, connector, or sensor as indicated. Clear codes, perform functional tests and road test. If wiring and sensors check good and reference at ECU is out of spec, consider ECU repair/replacement per manufacturer procedures.

Likely causes

  • Damaged or pinched harness on Sensor Reference G wiring
  • Corroded connector at the sensor or ECU causing intermittent contact
  • Connector pushed out of terminal or bent pin at ECU/sensor
  • Short to ground caused by chafed insulation rubbing on chassis
  • Internal ECU fault in reference voltage regulator

Fault status

⚠️ Status
Sensor Reference Voltage G Circuit Range/Performance — the ECM detects the reference supply voltage for sensor circuit G is outside allowable range or behaving improperly. Investigate wiring, connectors, sensor(s), power/ground, and ECU.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

P0102 P0112 P0192 P0200 P0627
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