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Home / DTC / P06B1 — Sensor Power Supply A Circuit Low

P06B1 — Sensor Power Supply A Circuit Low

Detailed page for trouble code P06B1.

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P06B1

Generic P — Powertrain

Sensor Power Supply A Circuit Low

Brand: Generic
Type: P — Powertrain
Views: UK: 16 EN: 22 RU: 19
AI status
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Page language: EN

Causes

  • Low or missing 5 V reference/sensor supply
  • Short to ground on the sensor power/signal wiring
  • Open or high resistance in wiring or connector
  • Poor sensor ground or chassis ground
  • Failed sensor
  • Blown fuse or failed power relay providing sensor supply

Symptoms

  • Malfunction Indicator Lamp (MIL) or CEL illuminated
  • Poor engine performance, hesitation or reduced drivability
  • Sensor-related systems not operating correctly (depends on which sensor uses Supply A)
  • Stored diagnostic trouble codes for the affected sensor(s)
  • Intermittent operation or limp-in mode depending on vehicle

What to check

  • Read freeze frame and all stored codes; note related sensor codes
  • Visually inspect wiring and connectors for damage, corrosion, bending or pin push-out
  • Check relevant fuses and relays for the sensor reference supply
  • Back-probe sensor connector and measure reference voltage, sensor output and ground
  • Perform continuity and resistance checks between sensor and ECU pins
  • Wiggle test wiring while monitoring voltages/scan tool for changes

Signal parameters

  • Sensor reference supply (typical): 5.0 V ± 0.25 V (acceptable ~4.75–5.25 V)
  • Sensor output: typically 0.1–4.9 V depending on sensor type and condition
  • Sensor ground: close to 0 V (
  • Open-circuit: infinite resistance; short-to-ground: near 0 Ω to chassis ground
  • Wiring harness continuity: low ohms (typically

Diagnostic algorithm

  1. Retrieve DTCs and freeze-frame; note which sensor(s) use Sensor Power Supply A and any related codes.
  2. Inspect connectors, wiring harness and sensor for obvious damage, corrosion, loose pins or water intrusion; repair as needed.
  3. Check fuses and relays that supply the sensor reference; replace if blown or faulty.
  4. With key ON (engine off), back-probe the sensor connector: measure the reference supply voltage, sensor output and ground. Compare to expected values.
  5. If reference supply is low or absent at the sensor, trace wiring back toward the ECU: check for short-to-ground or high-resistance/open using continuity and resistance checks.
  6. Measure continuity between sensor ground and ECU ground and between sensor supply pin and ECU supply pin. Repair any high resistance or opens.
  7. If wiring checks good at the connector, disconnect the sensor and measure the reference at the harness side. If present at harness but not at sensor when connected, suspect sensor failure.
  8. If possible, substitute a known-good sensor or connector jumper to confirm sensor vs wiring/ECU.
  9. If wiring and sensor are good and reference is low only at ECU, suspect internal ECU power/supply fault — perform ECU bench tests or consult manufacturer procedures before replacing ECU.
  10. After repairs, clear codes and perform a test drive; verify that the DTC does not return and that related systems operate correctly.

Likely causes

  • Blown fuse or faulty power/ignition relay supplying the sensor reference
  • Damaged, corroded or disconnected connector at the sensor
  • Short to ground in the sensor power or signal wiring
  • Faulty sensor (internal short or open)
  • Bad ECU sensor supply circuit

Fault status

⚠️ Status
Sensor Power Supply A Circuit Low — reference/supply voltage to sensor is below expected threshold. Possible causes: blown fuse/relay, short-to-ground, open/high resistance wiring, faulty sensor, or ECU internal fault.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

P0192 P0102 P0112 P06B0 P0135
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