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Home / DTC / P26E1 — Sensor Power Supply D Circuit High

P26E1 — Sensor Power Supply D Circuit High

Detailed page for trouble code P26E1.

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Code

P26E1

Generic P — Powertrain

Sensor Power Supply D Circuit High

Brand: Generic
Type: P — Powertrain
Views: UK: 14 EN: 22 RU: 18
AI status
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Page language: EN

Causes

  • Short to battery positive or ignition feed on the Sensor Power Supply D wiring
  • Damaged wiring harness or chafed insulation creating a high-voltage connection
  • Corroded or loose connector pins at the sensor or ECU causing abnormal voltage readings
  • Failed sensor that is feeding back voltage into the supply circuit
  • Failed ECU internal voltage reference/regulator or internal short
  • Aftermarket electrical accessory improperly connected to the sensor supply circuit

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Incorrect or missing sensor data for systems using Sensor Power Supply D
  • Driveability issues related to the affected sensor (rough idle, poor throttle response, limp mode)
  • Intermittent faults or faults that occur after accessory wiring changes

What to check

  • Read stored freeze frame and live data; note related codes and conditions when fault set
  • Visually inspect wiring and connectors for damage, corrosion, loose pins, or aftermarket taps
  • Back-probe sensor power terminal with key ON (engine OFF) and measure voltage
  • Disconnect the sensor and check if the fault clears or voltage changes
  • Check continuity/resistance between sensor power wire and battery positive for unintended shorts
  • Inspect ECU connector for corrosion or bent pins if accessible

Signal parameters

  • Nominal sensor power/reference voltage (Sensor Power Supply D): ≈ 5.0 V (varies by vehicle/manufacturer)
  • Typical acceptable range: ~4.8–5.2 V; a reading above ~5.5 V is commonly considered 'high' (consult vehicle-specific spec)
  • With key ON, engine OFF: supply should be stable and not exceed specified Vref by more than manufacturer tolerance
  • Open/short to battery will show near battery voltage on the supply line (~12 V with engine off, higher when charging)

Diagnostic algorithm

  1. Retrieve and record trouble codes, freeze-frame data and any related codes. Attempt a drive cycle to reproduce and confirm code.
  2. Perform visual inspection of wiring harness and connectors for the sensor(s) tied to Sensor Power Supply D. Pay attention to routing near sharp edges and hot components.
  3. With key ON (engine OFF), back-probe the sensor power terminal and measure voltage to ground. Compare with expected Vref. If voltage is high, proceed.
  4. Disconnect the sensor harness plug. Re-check voltage at the harness female terminal. If voltage returns to normal with the sensor disconnected, suspect the sensor or a retrofit/aftermarket device connected to that circuit.
  5. If voltage remains high with sensor disconnected, check for continuity between the sensor power wire and battery positive (engine OFF). A low resistance indicates a short to battery/ignition feed.
  6. Isolate sections of the harness by disconnecting intermediate connectors and measuring to find the short location. Repair damaged wiring, replace connectors or insulators as required.
  7. If wiring and connectors test good, swap or bench-test the suspect sensor if available. Replace sensor if it is proven faulty.
  8. If harness and sensor are good, verify voltages at the ECU connector. If the supply is high at the ECU, suspect internal ECU/regulator failure—replace ECU only after all external causes eliminated.
  9. Clear codes and perform a retest drive. Confirm no recurrence and that related systems operate normally.

Likely causes

  • Short to battery/ignition on the Sensor Power Supply D harness
  • Damaged connector or wiring (pinched, corroded, or bridged)
  • Faulty sensor causing feedback onto the supply line

Fault status

⚠️ Status
Stored when the control module detects that the Sensor Power Supply D circuit voltage is higher than the allowed threshold for the monitored interval. May set MIL and store freeze-frame data. Fault can be caused by a short to battery/ignition, a failed sensor feeding back voltage, or an ECU internal fault.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P26E0 P26E2 P0627 P0102 P0122
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