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Home / DTC / P06A7 — Reference voltage of sensor B - Circuit range/performance

P06A7 — Reference voltage of sensor B - Circuit range/performance

Detailed page for trouble code P06A7.

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P06A7

LAND ROVER P — Powertrain

Reference voltage of sensor B - Circuit range/performance

Brand: LAND ROVER
Type: P — Powertrain
Views: UK: 6 EN: 10 RU: 9
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Page language: EN

Causes

  • Open, short to ground, or short to battery in the reference supply or sensor signal wiring
  • Corroded, loose or damaged connector at sensor B
  • Defective sensor (internal short/open)
  • Failed or intermittent ECM reference/regulator circuit
  • Low or unstable battery/charging voltage affecting reference
  • Aftermarket modification or repair damage to the harness

Symptoms

  • Malfunction Indicator Lamp (MIL) / Check Engine light on
  • Reduced engine performance or limp mode (depending on sensor function)
  • Irregular idle, stalling, or rough running
  • Poor fuel economy or drivability issues
  • Intermittent faults that may come and go with vibration or temperature

What to check

  • Read stored codes and freeze-frame / live-data with a scan tool to capture conditions when the code set
  • Identify exact sensor B location and pinout from factory service information
  • Visually inspect sensor connector and wiring for damage, corrosion, water, or open pins
  • Backprobe the sensor connector (key ON, engine OFF) and measure reference voltage with a DMM
  • Check battery voltage and charging system for stability
  • Wiggle test harness while monitoring live-data or reference voltage for intermittent faults

Signal parameters

  • Expected sensor reference voltage: typically ~5.0 V (common tolerance ±0.25 V) with key ON, engine OFF
  • Reference must be stable (little ripple or noise) and not drop with load or vibration
  • Sensor output (if present) will vary according to sensed parameter; if reference is absent, output cannot be trusted
  • Battery voltage should be within normal range (approx. 12–14.5 V) during tests

Diagnostic algorithm

  1. Retrieve DTCs and freeze-frame data. Note conditions (engine temp, rpm, battery voltage) when code set.
  2. Consult OEM wiring diagrams/service manual to confirm sensor B function, connector pinout, and which ECM pin provides the reference.
  3. Perform visual inspection of the sensor, connector, and harness for damage, corrosion, water, or repair splice points.
  4. With key ON (engine OFF), backprobe the sensor connector and measure the reference voltage at the ECM side and the sensor side; compare readings.
  5. If reference voltage is missing at the sensor connector but present at ECM pin, inspect/repair harness between ECM and sensor for open circuit or high resistance.
  6. If reference is missing at ECM pin, check related fuses, main power/ground connections and test ECM reference/regulator circuit per factory procedure.
  7. If reference is present but unstable/noisy, use an oscilloscope to look for noise, intermittent dropouts, or spikes. Wiggle the wiring harness while monitoring.
  8. Unplug the sensor and measure connector pins for short to ground or short to battery (check resistance to ground/battery).
  9. If wiring and reference appear good, substitute a known-good sensor or bench-test the sensor if possible to confirm sensor fault.
  10. Repair or replace damaged wiring/connectors or replace faulty sensor/ECM as indicated. Clear codes and perform test drive to confirm repair.
  11. If ECM replacement is considered, confirm wiring and grounds are correct and perform OEM-specific ECM programming and relearn procedures.

Likely causes

  • Damaged wiring between ECM and sensor B (chafing, pinched, broken)
  • Poor pin contact or water ingress at the sensor connector
  • Sensor internal electrical failure
  • ECM reference-voltage output fault
  • Blown fuse or poor ground related to sensor power/reference circuit

Fault status

⚠️ Status
ECM detected reference voltage for Sensor B is out of expected range or intermittent. Voltage may be too low, too high, or unstable relative to the ECM's reference thresholds.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

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